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Sample records for purple sweet potato

  1. Extraction and Purification of Pigment from Purple Sweet Potato Wine Vinasse

    Directory of Open Access Journals (Sweden)

    Zhongsheng Zhao

    2015-02-01

    Full Text Available Purple sweet potato pigment is a natural food pigment with bright color and multiplies biological functions such as antioxidant activity etc. There is a large amount of unused pigment in the vinasse of purple sweet potato wine. Therefore, in this study, the extraction processes of purple sweet potato pigment from purple sweet potato wine vinasse, as well as its purification conditions were investigated. As the results, 0.9% citric acid-95% ethanol (2/3, v/v was a suitable extraction solvent to obtain the higher yield of purple sweet potato pigment from vinasse. AB-8 column chromatography showed that the loading ratio of 1/10 (w/v of resin and pigment with the solvent of 40% ethanol at the flow rate of 2 mL/min were the optimal conditions for the purification of purple sweet potato pigment.

  2. Purple sweet potato colour--a potential therapy for galactosemia?

    Science.gov (United States)

    Timson, David J

    2014-06-01

    Galactosemia is an inherited metabolic disease in which galactose is not properly metabolised. There are various theories to explain the molecular pathology, and recent experimental evidence strongly suggests that oxidative stress plays a key role. High galactose diets are damaging to experimental animals and oxidative stress also plays a role in this toxicity which can be alleviated by purple sweet potato colour (PSPC). This plant extract is rich in acetylated anthocyanins which have been shown to quench free radical production. The objective of this Commentary is to advance the hypothesis that PSPC, or compounds therefrom, may be a viable basis for a novel therapy for galactosemia.

  3. Purple sweet potato (Ipomea Batatas P. as dentin hypersensitivity desensitization gel

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    Chariza Hanum Mayvita Iskandar

    2015-12-01

    Full Text Available Background: Dentin hypersensitivity is a short sharp sense of pain in the teeth when exposed to excitatory stimulus. A total of 74% of world population experiencing dentin hypersensitivity. Home treatment topical desensitization is rarely found in Indonesia. The use of dentrifice is less practical because it must be done with regular brushing. Indonesia has abundant natural resources, one of which is purple sweet potato. Purple sweet potato (Ipomea Batatas P. has highest potasium ions compared to other foodstuffs. Potassium ions can be a solution of dentin hypersensitivity by temporary blocking the suffix pulp nerve impulses. Purpose: The research objective was to determine the effectiveness of the 10% purple sweet potato extract gel of the dental pain threshold score. Method: An experimental study carried out by dental pain threshold score measurements using vitality tester into the teeth with gum recession. Samples included 32 respondents with a single blind and pre-post test control group design. They were divided into treatment group and negative control group. Paired T-test and Wilcoxon were used as data analysis. Result: The results showed dental pain threshold score increasing either in treatment group and negative control, although not as significant as in the treatment group. Conclusion: 10% purple sweet potato extract gel containing potassium ions is able to reduce the pain of dentin hypersensitivity.

  4. Sweet Rice Wine Brewed with Purple-fleshed Sweet Potato%紫心甘薯酿制甜米酒

    Institute of Scientific and Technical Information of China (English)

    汤瑾; 李金生

    2009-01-01

    紫心甘薯含有大量的花青素,有一定的保健作用.以紫心甘薯为原料与糯米混合糖化发酵酿制的紫薯甜米酒,色泽深红透亮,口味鲜甜,酒香浓郁,该种深红色米酒为米酒类产品增添了新品种,同时为紫心甘薯的综合利用提供了新途径.%Purple-fleshed sweet potato contains plenty of anthocyanin,which promotes health in a certain way.The purple sweet potato rice wine is brewed from the fermented mixture of saccharified purple-fleshed sweet potato and glutinous rice.As the wine has a crystal carmine color,a fresh taste and fragrant odor,the burgundy-colored rice wine has added a new variety to the rice wine family,which provides a new way for the comprehensive use of purple-fleshed sweet potato.

  5. 紫薯挂面加工工艺研究%Processing Technology of Vermicelli with Purple Sweet Potato

    Institute of Scientific and Technical Information of China (English)

    苑建伟; 谢新华; 李巍

    2014-01-01

    以小麦粉和紫薯为主要原料,采用以紫薯泥代替紫薯淀粉的方法,对紫薯挂面的制作工艺进行研究。通过正交试验确定了生产紫薯挂面的最佳配方为紫薯与小麦粉比例3∶7、水添加量31%和谷朊粉添加量1.5%。用此配方生产的紫薯挂面色泽鲜艳,具有紫薯特有的香味,断条率低,口感良好,营养丰富。%Taking wheat flour and purple sweet potato as raw material, new technology of adding purple mashed potatoes instead of purple sweet potato starch was applied to study production process of purple sweet potato vermicelli. Optimum parameters of vermicelli with purple sweet potato were confirmed by orthogonal experiment.Results showed that ratio of purple sweet potato to wheat flour was 3∶7, water was 31%, wheat gluten was 1.5%.Product had bright color, special purple sweet potato flavor, low rate of broken bars, good taste and rich in nutrition.

  6. The development of purple sweet potato bread%紫薯甜面包的研制

    Institute of Scientific and Technical Information of China (English)

    高徐梅; 吕远平

    2011-01-01

    In order to enrich bread varieties and develop more nutritional bread,with the sensory evaluation as the index,the key technical parameters of purple sweet potato bread are determined by orthogonal test as the following:the addition of 100 g purple sweet potato powder and 180 g sugar to each 1 000 g flour,and the dough fermentation time 120 min.The final product has a good color and taste.The product's indexes of purple sweet potato bread are also put forward as well.%为了丰富面包品种、开发更具营养价值的面包,以紫薯甜面包的感官评分为考察指标,通过正交试验确定了紫薯甜面包的关键技术参数:每1 000 g面粉添加100 g紫薯粉、180 g白砂糖,面团发酵时间为120min,所研制的紫薯甜面包具有良好的色泽和口感。同时给出了紫薯甜面包的产品指标。

  7. The Functional Properties and Product Development of Purple Sweet Potato%紫甘薯的功能性质及产品开发研究

    Institute of Scientific and Technical Information of China (English)

    何胜生

    2013-01-01

    详细介绍了紫甘薯的营养成分及其生理功能的研究现状.同时,对紫色甘薯的营养及药用价值的深入研究也促进了紫甘薯加工的发展,简述了紫色甘薯脆片、紫色甘薯软糖、紫色地瓜干等紫甘薯系列产品的加工工艺.%The research status of nutritional components and physiological functions of purple sweet potato were introduced in details. The deeply research about nutrition and medicinal value of purple sweet potato could promote the development of purple sweet potato processing. The processing technique of purple sweet potato crisp, purple potato soft candy and dried purple sweet potato were briefly described.

  8. PARTIAL HYDROLYSIS OF PURPLE SWEET POTATO FLOUR BY AMYLASE FROM Saccharomycopsis fibuligera AND ITS APPLICATION FOR COMPOSITE BREADMAKING

    Directory of Open Access Journals (Sweden)

    Agus Safari

    2013-04-01

    Full Text Available Purple sweet potato is one of underutilized carbohydrate sources in Indonesia, whilst known as good source of carbohydrate and can act as functional food due to its anthocyanine and dietary fiber contents. Therefore in the present study, we try to modify the sweet potato flour by partial hydrolysis using amylase produced by Saccharomycospsis fibuligera R64 and apply the partially hydrolyzed flour for composite breadmaking. The amylase was produced using batch method and partially purified by the addition of ammonium sulfate followed by gel filtration chromatography on Sephadex G25 using fast performance liquid chromatography system. The enzyme was then used to hydrolyze the purple sweet potato flour. Characterizations of the partially hydrolyzed flour comprise reduction in amylose-iodine complex, SEM and XRD. Partially hydrolyzed flour was then used as composite flour for bread, with ratio of wheat to partially hydrolyzed purple sweet potato flour was 70 : 30. The produced bread was then analyzed for its texture, organoleptic test and visualization of the bread crumb using TEM. The results of the present study indicate that the enzyme partially hydrolyzed the sweet potato flour. Even though the quality of the composite bread is not as good as wheat bread, partial hydrolysis seems to improve the texture and appearance of the composite bread, as indicated by better swelling volume and firmness of the composite bread using partially hydrolyzed purple sweet potato flour.

  9. Ultrasound-Assisted Extraction, Centrifugation and Ultrafiltration: Multistage Process for Polyphenol Recovery from Purple Sweet Potatoes

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    Zhenzhou Zhu

    2016-11-01

    Full Text Available This work provides an evaluation of an ultrasound-assisted, combined extraction, centrifugation and ultrafiltration process for the optimal recovery of polyphenols. A purple sweet potato (PSP extract has been obtained using ultrasonic circulating extraction equipment at a power of 840 W, a frequency of 59 kHz and using water as solvent. Extract ultrafiltration, using polyethersulfone (PES, was carried out for the recovery of polyphenol, protein and anthocyanin. Pre-treatment, via the centrifugation of purple sweet potato extract at 2500 rpm over 6 min, led to better polyphenol recovery, with satisfactory protein removal (reused for future purposes, than PSP extract filtration without centrifugation. Results showed that anthocyanin was efficiently recovered (99% from permeate. The exponential model fit well with the experimental ultrafiltration data and led to the calculation of the membrane’s fouling coefficient. The optimization of centrifugation conditions showed that, at a centrifugation speed of 4000 rpm (1195× g and duration of 7.74 min, the optimized polyphenol recovery and fouling coefficient were 34.5% and 29.5 m−1, respectively. The removal of proteins in the centrifugation process means that most of the anthocyanin content (90% remained after filtration. No significant differences in the intensities of the HPLC-DAD-ESI-MS2 peaks were found in the samples taken before and after centrifugation for the main anthocyanins; peonidin-3-feruloylsophoroside-5-glucoside, peonidin-3-caffeoyl-p-hydroxybenzoylsophoroside-5-glucoside, and peonidin-3-caffeoyl-feruloyl sophoroside-5-glucoside. This proves that centrifugation is an efficient method for protein removal without anthocyanin loss. This study considers this process an ultrasound-assisted extraction-centrifugation-ultrafiltration for purple sweet potato valorization in “green” technology.

  10. KARAKTERISTIK WARNA DAN AKTIVITAS ANTIOKSIDAN ANTOSIANIN UBI JALAR UNGU [Color Characteristics and Antioxidant Activity of Anthocyanin Extract from Purple Sweet Potato

    OpenAIRE

    2014-01-01

    Anthocyanin is a natural pigment that produces a range of colors, varying from red, purple, blue to yellow. The stability of the anthocyanin color is affected by pH, temperature, and light. Purple sweet potato is rich in anthocyanin, particularly a stable acylated anthocyanin. This research was conducted to study the effect of pH on color and antioxidative activity of anthocyanin extracted from purple sweet potatoes, harvested from Cilembu-Sumedang, Banjaran-Bandung, and Pakembangan-Kuningan....

  11. Effects of Purple-fleshed Sweet Potato (Ipomoera batatas Cultivar Ayamurasaki) Powder Addition on Color and Texture Properties and Sensory Characteristics of Cooked Pork Sausages during Storage

    OpenAIRE

    Sang-Keun Jin; Yeong-Jung Kim; Jae Hong Park; In-Chul Hur; Sang-Hae Nam; Daekeun Shin

    2012-01-01

    This study was conducted to evaluate the effects of adding purple-fleshed sweet potato (PFP) powder on the texture properties and sensory characteristics of cooked pork sausage. Sodium nitrite alone and sodium nitrite in combination with PFP were added to five different treatments sausages (CON (control) = 0.01% sodium nitrite, SP25 = 0.005% sodium nitrite and 0.25% purple-fleshed sweet potato powder combination, SP50 = 0.005% sodium nitrite and 0.5% purple-fleshed sweet potato powder combina...

  12. KARAKTERISTIK WARNA DAN AKTIVITAS ANTIOKSIDAN ANTOSIANIN UBI JALAR UNGU [Color Characteristics and Antioxidant Activity of Anthocyanin Extract from Purple Sweet Potato

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    Ai Mahmudatussa’adah1,2*

    2014-12-01

    Full Text Available Anthocyanin is a natural pigment that produces a range of colors, varying from red, purple, blue to yellow. The stability of the anthocyanin color is affected by pH, temperature, and light. Purple sweet potato is rich in anthocyanin, particularly a stable acylated anthocyanin. This research was conducted to study the effect of pH on color and antioxidative activity of anthocyanin extracted from purple sweet potatoes, harvested from Cilembu-Sumedang, Banjaran-Bandung, and Pakembangan-Kuningan. The experiments applied a completely randomized design with two replicates, analyzed in triplo. The results showed that the total number of monomeric anthocyanin in purple sweet potato harvested from Cilembu (3.78±0.08 mg cyanidin-3-glucoside/g dry weight, dw was higher than that of Banjaran (3.18±0.01 mg/g and Pakembangan (2.25±0.01 mg/g. The color of purple sweet potato anthocyanin extract was pH dependent. The color changed from red to faded red, purple, blue, green, and yellow as the pH increased from 1 to 14. The content of anthocyanins from three locations of purple sweet potatoes differed from each other (p<0.05. Radical scavenging activity and reducing power of purple sweet potato anthocyanins extracted at pH 1 was higher than that at pH 4.5 and pH 7.

  13. Characterization and Prebiotic Effect of the Resistant Starch from Purple Sweet Potato

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    Yafeng Zheng

    2016-07-01

    Full Text Available Purple sweet potato starch is a potential resource for resistant starch production. The effects of heat-moisture treatment (HMT and enzyme debranching combined heat-moisture treatment (EHMT on the morphological, crystallinity and thermal properties of PSP starches were investigated. The results indicated that, after HMT or EHMT treatments, native starch granules with smooth surface was destroyed to form a more compact, irregular and sheet-like structure. The crystalline pattern was transformed from C-type to B-type with decreasing relative crystallinity. Due to stronger crystallites formed in modified starches, the swelling power and solubility of HMT and EHMT starch were decreased, while the transition temperatures and gelatinization enthalpy were significantly increased. In addition, HMT and EHMT exhibited greater effects on the proliferation of bifidobacteria compared with either glucose or high amylose maize starch.

  14. Characterization and Prebiotic Effect of the Resistant Starch from Purple Sweet Potato.

    Science.gov (United States)

    Zheng, Yafeng; Wang, Qi; Li, Baoyu; Lin, Liangmei; Tundis, Rosa; Loizzo, Monica R; Zheng, Baodong; Xiao, Jianbo

    2016-07-19

    Purple sweet potato starch is a potential resource for resistant starch production. The effects of heat-moisture treatment (HMT) and enzyme debranching combined heat-moisture treatment (EHMT) on the morphological, crystallinity and thermal properties of PSP starches were investigated. The results indicated that, after HMT or EHMT treatments, native starch granules with smooth surface was destroyed to form a more compact, irregular and sheet-like structure. The crystalline pattern was transformed from C-type to B-type with decreasing relative crystallinity. Due to stronger crystallites formed in modified starches, the swelling power and solubility of HMT and EHMT starch were decreased, while the transition temperatures and gelatinization enthalpy were significantly increased. In addition, HMT and EHMT exhibited greater effects on the proliferation of bifidobacteria compared with either glucose or high amylose maize starch.

  15. Intelligent pH indicator film composed of agar/potato starch and anthocyanin extracts from purple sweet potato.

    Science.gov (United States)

    Choi, Inyoung; Lee, Jun Young; Lacroix, Monique; Han, Jaejoon

    2017-03-01

    A new colorimetric pH indicator film was developed using agar, potato starch, and natural dyes extracted from purple sweet potato, Ipomoea batatas. Both agar and potato starch are solid matrices used to immobilize natural dyes, anthocyanins. The ultraviolet-visible (UV-vis) spectrum of anthocyanin extract solutions and agar/potato starch films with anthocyanins showed color variations to different pH values (pH 2.0-10.0). Fourier transform infrared (FT-IR) and UV-vis region spectra showed compatibility between agar, starch, and anthocyanin extracts. Color variations of pH indicator films were measured by a colorimeter after immersion in different pH buffers. An application test was conducted for potential use as a meat spoilage sensor. The pH indicator films showed pH changes and spoilage point of pork samples, changing from red to green. Therefore, the developed pH indicator films could be used as a diagnostic tool for the detection of food spoilage.

  16. KANDUNGAN ANTOSIANIN DAN AKTIVITAS ANTIOKSIDAN UBI JALAR UNGU SEGAR DAN PRODUK OLAHANNYA (Anthocyanins Content and Antioxidant Activity of Fresh Purple Fleshed Sweet Potato and Selected Products

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    Nida El Husna

    2013-11-01

    Full Text Available Purple fleshed sweet potato is a potential source of anthocyanins which is as an antioxidant, antimutagenic, and anticarcinogenic. Anthocyanins can be damaged by high temperatures. However, traditionally a number of processed sweet potato products involve heat treatment. This study aimed to assess the reduction of anthocyanins content in processed sweet potato products (flour, chips, sweet potato, steamed, boiled, and fried pieces from two types of local purple fleshed sweet potato (light purple and dark purple, therefore it might provide useful information stages in order to maintain the content of anthocyanins. The experiment was arranged in a Randomized Complete Block Design (RCBD of factorial arrangement treatments (two types of purple fleshed sweet potato, and five types of purple fleshed sweet potato processed products. The main analysis parameter are anthocyanins content and antioxidant activity. The anthocyanins content of dark purple fleshed sweet potato was 61.85 mg/100g, 17 times higher than light purple fleshed sweet potatoes 3.51 mg/100g. Dark purple fleshed sweet potatoes have antioxidant activity approximately 59.25%, greater than light purple fleshed sweet potatoes 56.64%. Decrease in anthocyanins content for processed products from both types of purple sweet potatoes showed the same trend. Purple sweet potato processed products that able to maintain fairly high the content of anthocyanins (the lowest rate of decline in anthocyanin levels were obtained on a steamed sweet potato (34.14% for dark purple and 42.16% for light purple, while the highest reduction obtained on the product chips (95.21% for dark purple and 88.47% for light purple. Reduction of antioxidant activity showed a directly proportion of the decrease in anthocyanins content of processed products, with the exception of processed products chips. Keywords: Purple fleshed sweet potato, anthocyanin content, antioxidant activity   ABSTRAK Ubi jalar ungu potensial

  17. Production of elastic sausage with purple sweet potato leaves%紫薯叶弹力香肠的制作

    Institute of Scientific and Technical Information of China (English)

    王岩

    2016-01-01

    研究以猪肉为主要原料,添加紫薯叶,在传统香肠肉制品的加工工艺和配方基础之上进行改进,制作出紫薯叶弹力香肠,该弹力香肠具有较好的感官和理化指标,营养价值较高。%The pork was taken as the main raw material. On the basis of traditional sausage meat products, the process technology and formula were improved, and purple sweet potato leaves were added to make the elastic sausage of purple sweet potato leaves. The elastic sausage had better sensory and physical and chemical indicators, and had high nutritional value.

  18. Application prospect of purple sweet potatoes in meat products%紫薯在肉制品中的应用前景

    Institute of Scientific and Technical Information of China (English)

    陈彦冰; 胡红梅; 祝恒前; 孙大地; 毛晓茗

    2012-01-01

    自紫薯引入中国,其产品开发类型主要围绕着色素提取和功能性食品进行的;其中功能性食品包括紫薯全粉、冻干食品、紫薯饮料、茎尖蔬菜和休闲食品。结合紫薯的营养价值和紫薯淀粉的理化性质,本文对紫薯在肉制品行业的应用前景进行了探讨,同时为新品研发提供可行性依据。%Since the purple sweet potatoes were introduced into China, its products development mainly focus on pigment extraction and functional food. Functional foods included purple sweet potatoes powder, freeze -dried food, beverage made by purple sweet potatoes, stem tip vegetables and snack foods. Combination of nutrition value of purple sweep potatoes and physicochemical properties of purple sweet potato starch, the application prospect of purple sweet potatoes in meat industry was discussed, which providing a feasible basis for new product development.

  19. 紫薯生物饮料的研制%Preparation of Purple Sweet Potato Biological Beverage

    Institute of Scientific and Technical Information of China (English)

    徐峰

    2016-01-01

    With purple sweet potato as the main material,the technology of preparing purple sweet potato biological beverage was stud-ied.By single factor experiment and orthogonal test,the optimum purple sweet potato beverage formula was 4% sucrose,0.15% citric acid and 0.15% Composite stabilizers(CMC -Na :xanthan gum :agar =1:1:1).After optimization,the beverage featured by bright color,good taste,rich nutrition and it is one kind of potential biological beverage.%以紫薯为原料,对紫薯生物饮料加工工艺进行研究.通过单因素与正交实验确定了紫薯饮料的最佳调配工艺参数为:蔗糖添加量为4%,柠檬酸添加量为0.15%,复合型稳定剂(CMC -Na∶黄原胶∶琼脂=1∶1∶1)添加量为0.15%.此工艺参数下制作的紫薯饮料色泽鲜艳、口感良好、营养丰富并且具有一定的市场发展潜力.

  20. 紫薯造型饼干的研制%Development of Purple Sweet Potato Biscuits of Different Shapes

    Institute of Scientific and Technical Information of China (English)

    宋燕飞; 李燮昕; 柴琦; 杨悠; 刘天杰

    2016-01-01

    Purple sweet potato is rich in anthocyanin and selenium,and its nutritional value and health function are attracting increasing attention.This paper establishes the optimal formulation for purple sweet potato bis-cuits by means of orthogonal test and sensory evaluation:25g purple sweet potato flour,210g cake flour,80g ic-ing sugar,110g salt-free butter,70g egg yolk,40g milk powder,and 5.5 PH value.Biscuits of this recipe are popular for its color and texture.%紫薯富含丰富的花青素和硒元素,其营养价值和保健作用日益引起人们的高度关注。文章以紫薯饼干为基础,通过正交试验、感官鉴评确定最优配方和生产工艺为:紫薯粉25g、低筋面粉210g、糖粉80g、无盐黄油110g、蛋黄70g、奶粉40g,pH值为5.5。按照最优配方所研制的紫薯造型饼干具有良好的色泽和口感,更受大众喜爱。

  1. The Modulatory Effect of Anthocyanins from Purple Sweet Potato on Human Intestinal Microbiota in Vitro.

    Science.gov (United States)

    Zhang, Xin; Yang, Yang; Wu, Zufang; Weng, Peifang

    2016-03-30

    In order to investigate the modulatory effect of purple sweet potato anthocyanins (PSPAs) on human intestinal microbiota, PSPAs were prepared by column chromatography and their influence on intestinal microbiota was analyzed by monitoring the bacterial populations and analyzing short-chain fatty acid (SCFA) concentrations at different time points. The numbers (log10 cell/mL) of Bifidobacterium and Lactobacillus/Enterococcus spp., Bacteroides-Prevotella, Clostridium histolyticum, and total bacteria after 24 h of culture in anaerobic fermentation broth containing PSPAs were 8.44 ± 0.02, 8.30 ± 0.01, 7.80 ± 0.03, 7.60 ± 0.03, and 9.00 ± 0.02, respectively, compared with 8.21 ± 0.03, 8.12 ± 0.02, 7.95 ± 0.02, 7.77 ± 0.02, and 9.01 ± 0.03, respectively, in the controls. The results showed that PSPAs induced the proliferation of Bifidobacterium and Lactobacillus/Enterococcus spp., inhibited the growth of Bacteroides-Prevotella and Clostridium histolyticum, and did not affect the total bacteria number. Total SCFA concentrations in the cultures with PSPAs were significantly higher than in the controls (P microbiota, contributing to improvements in human health.

  2. The Development of Steamed Sponge Cake of Purple Sweet Potato%紫薯发糕的研制

    Institute of Scientific and Technical Information of China (English)

    宋燕飞; 李燮昕; 柴琦; 刘天杰; 杨悠

    2016-01-01

    紫薯含有丰富的花青素和砷元素,其营养价值和保健作用引起人们的高度关注。文章以试验制作为基础,通过感官评价确定紫薯发糕最优配方和生产工艺为:紫薯泥120g,酵母3g,白糖40g,中筋面粉300g,温水270g(水温30℃)。%In recent years,with more and more awareness people put on their healthcare,the purple sweet pota-to,on accout of its beneficial components,is gradually becoming public's choice for diet.Taking purple sweet potato sponge cake as its subject,this paper explores its optimal recipe and production through orthogonal tests and sensory evaluation.The findings suggest the following recipe:120g mashed purple sweet potato,3g yeast, 40g sugar,300g all-purpose flour,and 270g water(30℃).

  3. Study on the Technology of Purple Yam and Purple Sweet Potato Noodles%紫淮山紫薯营养面条的研制

    Institute of Scientific and Technical Information of China (English)

    李冬梅; 杨君; 周妮妮; 张伟惠; 赖来展

    2014-01-01

    Powder was made by vacuum drying fresh purple yam.With purple yam powder,purple sweet potato powder and flour as the main raw material a new nutritional and heathy noodles was made.Through the combination of single-factor test and orthogonal test was used to determine noodle break rate,loss rate,and sensory evaluation value,the best formula of noodles was concluded.The results showed that the optimum compound for purple chinese yam and purple sweet potato noodle is flour amout 100 g,salt 1.5 g,purple yam powder 10%, purple sweet potato powder 5%, earrageenin 0.5%.Under the obove congditiongs, the noole break rate is 0 and the noodle loss rate is 8.25%,the product has good sensory properties,high nutrional value ,strong health fountion,it would have a broad market prospect.%用新鲜紫淮山通过真空干燥制得紫淮山粉。以紫淮山粉、紫薯粉、面粉为主要原料,研制成新型营养保健面条。采用单因素和正交试验相结合的方法测定面条的断条率、烹煮损失率和感官评价值,确定紫淮山紫薯面条的最佳加工工艺配方。结果表明:紫淮山紫薯面条的最佳配方为高筋面粉量100 g,食盐1.5 g,添加紫淮山粉10%,紫薯粉5%,卡拉胶0.50%。在此工艺条件下,面条断条率为0、烹煮损失率为8.25%,产品感官性状良好、营养价值高、保健作用强,具有广阔的市场前景。

  4. WATER EXTRACT OF PURPLE SWEET POTATO TUBERS REDUCES BLOOD PRESSURE 0F HYPERTENSIVE RATS INDUCED BY NaCl

    Directory of Open Access Journals (Sweden)

    I MADE JAWI

    2013-04-01

    Full Text Available Compliance of hypertensive patients to take medication is one of many determinant factors to achieve successful treatment. Side effects and the expensive price of drugs are the causes of the incompliance of patients taking the medication. Utilization of herbal medicine is a new hope to resolve the issue. Purple sweet potato tuber is a plant part that expected has beneficial effect in lowering blood pressure because it contains anthocyanins which are antioxidants and can preserve endothelial function. To prove these hypothesis, a study was conducted with randomized control group pre and post-test design. The  study was done on 20 adult male Wistar rats that were divided into two groups of 10 rats.  Both groups of rats were made hypertensive by administering high doses of NaCl. Control group of rats given only NaCl alone for 14 days. Treatment group were given NaCl and water extract of purple sweet potato tuber with a dose of 4 cc per day for 14 days. Before treatment and during treatment, blood pressure were taken everyday with special sphygmomanometer. The results indicate a significant difference in blood pressure between the control group with treatment (P = 0.0001. In the treatment group, it was observed that there was a significant decrease in blood pressure compared to the control group (P=0.0001. From the results of this study, it can be concluded that administration of purple sweet potato tuber water extract may lower high blood pressure of rats induced by NaCl.

  5. 紫甘薯乳酸菌饮料工艺技术研究%Study on the Technology of Purple Sweet Potato Yogurt

    Institute of Scientific and Technical Information of China (English)

    黄和升; 王海平

    2015-01-01

    以紫甘薯和鲜乳为主要原料,研制紫甘薯活性乳酸菌饮料。通过单因素试验和正交试验确定紫甘薯乳酸菌饮料的最佳工艺条件为:发酵时间6.5 h、柠檬酸的添加量0.4%、白砂糖添加量8%、紫甘薯添加量20%,所得产品质地均匀,口感细腻,酸甜可口,具有紫甘薯的香味和浓郁的乳酸菌发酵的奶香味,理化指标和微生物指标均符合国家标准GB 16321-2003《乳酸菌饮料卫生标准》。%Purple sweet potato lactobacillus drink was made by making use of fresh milk and purple sweet potato. On the basis of single factor experiments ,process Condition was optimizated through a orthogonal experiments.Results showed that the optimal process parameters were as follows:fermentation time 6.5 h , citric acid 0.4%,sugar 8%,purple sweet potato20%.Purple sweet potato lactobacillus drink has refreshing taste , pure flavor, sweet and sour taste, of lactobacillus drink and purple sweet potat. The quality of purple sweet potato lactobacillus drink was in accordance with GB 16321-2003.

  6. 紫山药紫甘薯保健酸乳的开发研究%Research and Development on Purple Sweet Potato and Purple Yam Acidophilus Milk

    Institute of Scientific and Technical Information of China (English)

    孔庆新; 袁书林

    2012-01-01

    以紫山药、紫甘薯和牛乳为原料,研发出一种集营养与保健作用为一体的新型保健饮料——紫山药紫甘薯保健酸乳;对其生产过程中的护色、发酵原料配比和发酵工艺参数分别进行了正交试验筛选。结果表明:紫山药紫甘薯最佳护色条件为柠檬酸0.4%、维生素C1.3%、氯化钙f1.30%,护色时间2h;发酵原料最佳配比V(为紫山药原浆):V(紫甘薯原浆)=2:1、原料乳的添加量为25%、糖的添加量为4%;最佳发酵工艺参数为发酵时间7h、发酵温度43℃、接种量4%。%Purple yam, purple sweet potato and milk as raw materials, "Purple Sweet Potato and Purple Yam Acidophilus Milk"--a new type of healthy drink was developed. The craft of protecting color, the ratio of raw material and ferrtaentation process parameters were optimized by the orthogonal test. The results showed that the optimal protecting color conditions were citric acid 0.4%, vitamin C 1.3%, calcium chloride 0.30%, protect color time 2 h; the optimal ratio of raw material were purple yam juice : purple sweet potato=2 : 1, the raw milk 25%, sucrose 4%. The optimal fermentation process parameters were fermentation time 7 h, fermentation temperature 43℃, inoculation concentration 4%.

  7. 紫薯电热加温育苗技术%Seedling Technology of Purple Sweet Potato using Electric Heating

    Institute of Scientific and Technical Information of China (English)

    陈相波; 张萍; 魏伟; 龚礼萍; 欧阳昌东

    2014-01-01

    紫薯发芽难、发芽慢,造成紫薯种植中低产、低效。采用电热加温育苗,提早紫薯播种育苗,可有效解决薯块发芽难问题,提高紫薯发芽率以及育苗产率。早播促早发,早发促早栽,早栽促丰产、高效。%It was difficult for purple sweet potato to germinate and sprout quickly which caused the low output and efficiency in its plantation. The application of seedling technology by electric heating solved the problem effectively, which could speed up the process of sprouting for purple sweet potato seeds, and could improve its sprouting rate and seedling rate. In a word, early sowing shortened the sprouting time, then the seeding can be planted early to ensure the high yield and efficiency.

  8. Green ultrasound-assisted extraction of anthocyanin and phenolic compounds from purple sweet potato using response surface methodology

    Science.gov (United States)

    Zhu, Zhenzhou; Guan, Qingyan; Guo, Ying; He, Jingren; Liu, Gang; Li, Shuyi; Barba, Francisco J.; Jaffrin, Michel Y.

    2016-01-01

    Response surface methodology was used to optimize experimental conditions for ultrasound-assisted extraction of valuable components (anthocyanins and phenolics) from purple sweet potatoes using water as a solvent. The Box-Behnken design was used for optimizing extraction responses of anthocyanin extraction yield, phenolic extraction yield, and specific energy consumption. Conditions to obtain maximal anthocyanin extraction yield, maximal phenolic extraction yield, and minimal specific energy consumption were different; an overall desirability function was used to search for overall optimal conditions: extraction temperature of 68ºC, ultrasonic treatment time of 52 min, and a liquid/solid ratio of 20. The optimized anthocyanin extraction yield, phenolic extraction yield, and specific energy consumption were 4.91 mg 100 g-1 fresh weight, 3.24 mg g-1 fresh weight, and 2.07 kWh g-1, respectively, with a desirability of 0.99. This study indicates that ultrasound-assisted extraction should contribute to a green process for valorization of purple sweet potatoes.

  9. 凝固型紫红薯酸奶制备工艺的研究%Production technology of solidified purple sweet potato yogurt

    Institute of Scientific and Technical Information of China (English)

    邓锦坚; 刘唤明

    2011-01-01

    The solidified purple sweet potato yogurt was fermented by Lactobacillus bulgaricus and Streptococcus thermophilus in the paper using purple sweet potato, defatted milk powder and sugar as raw materials.The optimal fermentation conditions were obtained by single factors and orthogonal experiments as follows: the mass ratio of purple sweet potato to water 2:8, sugar 8%, inoculum 4% and fermentation time 6h.Under these conditions, the solidified purple sweet potato yogurt was rich in anthocyanin.%以紫红薯、脱脂奶粉和白糖为原料,采用保加利亚乳杆菌和嗜热链球菌发酵研制凝固型紫红薯酸奶.通过单因素试验验和正交试验优化,确定了凝固型紫红薯酸奶的制备工艺.试验表明,最佳紫红薯酸奶发酵条件为紫红薯与水按2:8的质量比、8%白砂糖、接种量4%及发酵时间6h,可生产出富含花青素的凝固型紫红薯酸奶.

  10. The influences of purple sweet potato anthocyanin on the growth characteristics of human retinal pigment epithelial cells

    Directory of Open Access Journals (Sweden)

    Min Sun

    2015-06-01

    Full Text Available Background: Anthocyanins have been proven to be beneficial to the eyes. However, information is scarce about the effects of purple sweet potato (Ipomoea batatas, L. anthocyanin (PSPA, a class of anthocyanins derived from purple sweet potato roots, on visual health. Objective: The aim of this study was to investigate whether PSPA could have influences on the growth characteristics (cellular morphology, survival, and proliferation of human retinal pigment epithelial (RPE cells, which perform essential functions for the visual process. Methods: The RPE cell line D407 was used in the present study. The cytotoxicity of PSPA was assessed by MTT assay. Then, cellular morphology, viability, cell cycle, Ki67expression, and PI3K/MAPK activation of RPE cells treated with PSPA were determined. Results: PSPA exhibited dose-dependent promotion of RPE cell proliferation at concentrations ranging from 10 to 1,000 µg/ml. RPE cells treated with PSPA demonstrated a predominantly polygonal morphology in a mosaic arrangement, and colony-like cells displayed numerous short apical microvilli and typical ultrastructure. PSPA treatment also resulted in a better platform growing status, statistically higher viability, an increase in the S-phase, and more Ki67+ cells. However, neither pAkt nor pERK were detected in either group. Conclusions: We found that PSPA maintained high cell viability, boosted DNA synthesis, and preserved a high percentage of continuously cycling cells to promote cell survival and division without changing cell morphology. This paper lays the foundation for further research about the damage-protective activities of PSPA on RPE cells or human vision.

  11. PEMANFAATAN UBI JALAR UNGU (Ipomoea batatas L. Poir SEBAGAI PENGGANTI SEBAGIAN TEPUNG TERIGU DAN SUMBER ANTIOKSIDAN PADA ROTI TAWAR [Purple Sweet Potato (Ipomoea batatas L. Poir as a Partial Subtitute of Wheat flour and Source of Antioxidant on Plain Bread

    Directory of Open Access Journals (Sweden)

    Hardoko*

    2010-06-01

    Full Text Available Purple sweet potato (Ipomoea batatas L. Poir is potential for functional food, especially as antioxidant source due to its purple color and other nutrient content. The objective of this research was to produce plain bread containing antioxidant by partial substitution of wheat flour with purple sweet potato flour. The result showed that the best plain bread was produced by a maximum substitution of 20% purple sweet potato flour to wheat flour. The hedonic characteristics of the resulting bread including aroma, taste, and texture were not significantly different from bread without substitution. Nevertheless, the crust was harder and darker. Addition of 1.0% GMS emulsifier and reduction of purple potato flour to 15% increased the score of softness, hedonic texture, acceptance level, as well as the volume of the bread. The substituted bread had antioxidant activity of 55833.78 ppm DPPH as shown by the IC50 value and contained 4.30% of dietary fiber.

  12. Optimization of formula of solidified purple sweet potato andblack sesame yoghurt%凝固型紫甘薯黑芝麻酸奶的配方优化

    Institute of Scientific and Technical Information of China (English)

    郑清; 袁呈冰

    2012-01-01

    以紫甘薯和黑芝麻为主要原料,研制凝固型酸奶。在单因素实验的基础上,采用响应曲面法,对紫甘薯黑芝麻酸奶配方参数,即紫甘薯黑芝麻量、接种量、蔗糖用量进行了优化分析。其最佳配方为:黑芝麻粉紫甘薯肉丁用量为1∶4.56,接种量为4.12%,蔗糖用量为7.75%。所制产品为乳白色相间着淡紫色,酸甜适中,不含防腐剂,不添加色素,外观靓丽、味道独特的营养食品。%Purple sweet potato and black sesame were used as raw materials to conduct solidified yoghurt.The formula of purple sweet potato and black sesame yoghurt were optimized by response surface methodology(RSM)based on single factor experiments through evaluating the effects of quantity of purple sweet potato and black sesame content,inoculum and the amount of sucrose.The optimum formula was the quantity of black sesame powder and purple sweet potato pieces 1:4.56,inoculum 4.12%,sucrose 7.75%.Overall product was white and white with lavender,sweet and sour moderate,no preservatives,no added color,and it was a nutrition foodstuff with beautiful appearance and unique taste.

  13. Recent Study Progress in the Extraction and Applications of Natural Pigments from Purple Sweet Potatoes%紫甘薯中天然色素的提取及应用的研究

    Institute of Scientific and Technical Information of China (English)

    倪达丽; 周楷旋; 卢宝; 舒通盛; 纪漫; 喻寒; 黄卫东

    2015-01-01

    价格低廉的紫甘薯中含有丰富的天然紫红色素,其色泽艳丽,安全无毒,是一种绿色可替换合成色素的食品添加剂,具有广阔的应用前景.本文就紫甘薯色素的提取工艺及应用方面的国内外最新成果和研究情况进行了概述,旨在为紫甘薯色素的提取工艺优化及后续产品的深度开发提供参考.%Purple sweet potatoes, which are cheap just like sweet potatoes, contain rich natural purple pigments. The pigments from purple sweet potatoes are magnificently colorful, safe and non-toxic and green food additive for widespread use of natural food coloring and they could become a more popular natural alternative to synthetic food coloring. The latest research achievements and development situation about the extraction and application of purple sweet potato pigment at home and abroad were summarized to provide reference for developing depth of follow-up products and extraction process'optimization of purple sweet potato pigment. The development of more efficient processes to extra pigment could encourage the creation of a domestic natural food coloring industry, making purple sweet potatoes more affordable.

  14. Utility Value and Development Prospect of Purple-fleshed Sweet Potato%紫心甘薯的利用价值与开发前景

    Institute of Scientific and Technical Information of China (English)

    赵璇; 金素娟; 李占军; 王玉岭

    2012-01-01

    紫心甘薯集营养、保健于一体,近年来在国内外市场上十分走俏,是当前无公害、绿色、有机食品中首推的保健食品。从药用价值和食品加工2个方面,分析了紫心甘薯的开发利用价值与前景,提出进一步开展紫心甘薯利用潜力和相关加工的研究,对增加食品多样性、提高紫心甘薯综合利用率、加快农业产业结构调整升级、增加农民收入等具有长远和重要意义。%Purple-fleshed sweet potato is the main health food of pollution-free,green and organic,and very popular in national and international markets in recent years,which with nutrition and health function.Utility value and development prospect of purple-fleshed sweet potato were analyzed from two aspects of medicinal value and food processing,and the further development of utilization potential and related processing research of purple-fleshed sweet potato were put forward,which had a long-term and important significance for increasing the diversity of food,improving the comprehensive utilization of purple-fleshed sweet potato,speeding up the structural adjustment and upgrade of agricultural industry,increasing the farmers' income.

  15. 紫番薯汁酶解工艺条件研究%Enzyme Hydrolysis Conditions of Purple Sweet Potato Juice

    Institute of Scientific and Technical Information of China (English)

    涂薇; 叶盛; 邓放明

    2015-01-01

    This test in order to solve the problem of purple sweet potato starch content high, in the preparation process of purple sweet potato juice, the second method is adopted double enzyme common way to handle it, add alpha amylase and saccharifying enzyme digestion of purple sweet potato starch, and through the single factor and orthogonal test to determine the optimal enzy-matic hydrolysis conditions.The results show that the best effect of purple sweet potato cooking 40 min, adopting 1:6 ratio of mate-rial to water juice, first, under the conditions of alpha amylase 25μ/g, temperature 80℃, pH6.5, enzymatic hydrolysis 50 min. Then,under the condition of saccharifying enzyme 40μ/g, temperature 45℃, pH6.0 ,digestion enzyme solution of 60 min.%为解决紫番薯淀粉含量高的难题,在制备紫番薯汁的工艺过程中,采用二次法双酶共用的处理方式,添加α-淀粉酶和糖化酶酶解紫番薯中的淀粉,并通过单因素和正交试验确定最优的酶解工艺条件.结果表明,紫番薯蒸煮40 min,采用1:6的料水比榨汁,先在α-淀粉酶25 U/g、温度80℃、pH6.5的条件下酶解50 min,然后在糖化酶40 U/g、温度45℃、pH6.0的条件下酶解60 min的酶解效果最佳.

  16. Application of Purple Sweet Potato Anthocyanins in Ice Cream%紫甘薯花青素在冰淇淋中的应用研究

    Institute of Scientific and Technical Information of China (English)

    金鑫

    2014-01-01

    对紫甘薯花青素在冰淇淋中的应用进行研究。通过正交实验确定了紫甘薯花青素添加量,并对其在冰淇淋中的功能特性进行了评价。结果表明,紫甘薯花青素最佳添加量为20 mg/100 g,其超氧阴离子清除率和羟基自由基清除率分别为66%和87%,显著高于同浓度抗坏血酸,具有优良的抗氧化特性。%Application of purple sweet potato anthocyanins in ice cream was studied. The purple sweet potato anthocyanins content was determized by orthogonal experiment, and the functional features in ice cream was evaluated. The results indicated that purple sweet potato anthocyanins additive amount was 20 mg/100 g , Removing rate of superoxide anion radical was 66%, and elimination ratio of hydroxyl radicals was 87%, which were significantly higher than ascorbic acid, possessing a superior antioxidant property.

  17. 紫红薯醋苹果汁复合饮料的研制%Development of Compound Beverages Containing Purple Sweet Potato Vinegar and Apple Juice

    Institute of Scientific and Technical Information of China (English)

    史经略

    2012-01-01

    Compound beverages of apple juice and purple sweet potato vinegar was produced, with purple sweet potato and apple as raw materials. The optimal alcoholic fermentation and acetic acid fermentation conditions formulation were investigated using orthogonal array design. The best conditions for alcohol fermentation were initial sugar content 16%, fermentation time 72 h and temperaure 30 V. The best conditions for acetic acid fermentation were fermentation temperature 32.01 ?, initial alcohol content 7.25%, inoculation amount 9.79% and initial pH 4.54. The optimum formula for compound beverages were as follows: purple sweet potato vinegar 30%, apple juice 40%, purple sweet potato sirup 9%. The final product obtained tasted soft and had vinegar fragrance and purple sweet potato and apple juice.%以紫红薯、苹果为原料,研制紫红薯醋苹果汁复合饮料,采用单因素、正交试验和响应面法对酿造工艺条件和饮料的配方进行了优化.结果表明:酒精发酵最佳条件为发酵温度30℃、初始糖度16%、发酵时间72 h;醋酸发酵的最佳条件为发酵温度32.01℃、初始酒精度7.25%、醋酸茵接种量9.79%、初始pH值4.54,复合饮料配方为紫红薯醋添加量30%、苹果汁添加量40%、紫红薯糖浆添加量9%.所得的紫红薯醋苹果汁复合饮料酸味柔和,具有醋香和紫红薯、苹果特有的香气.

  18. Study on the Stability of Natural Edible Pigment Anthocyanin from Purple Sweet Potato%天然食用色素紫甘薯花青素的稳定性研究

    Institute of Scientific and Technical Information of China (English)

    谢程程; 王勇; 宫立晶

    2012-01-01

    采用乙醇浸提法提取紫甘薯花青素,考察了紫甘薯花青素的稳定性。紫甘薯花青素是水溶性色素,具有较强的耐热性,避光保存花青素的稳定性最好。食品防腐剂对紫甘薯花青素的稳定性无明显影响;葡萄糖、蔗糖对花青素有一定的护色作用;VC对紫甘薯花青素影响较明显;H2O2,Cu2+和Fe2+对紫甘薯花青素的稳定性影响较大,其中Cu2+,Fe2+会使花青素溶液变浑浊。%The purple sweet potato anthocyanin was extracted by ethanol extraction.The stability of purple sweet potato anthocyanin was investigated.The purple sweet potato anthocyanin was water-soluble pigment,it had a strong resistance of heat and the best stability of anthocyanin was kept from light.Food preservatives had no effect on the stability of purple sweet potato anthocyanins;glucose and sucrose had a certain color-protecting effect on purple sweet potato anthocyanin;VC had effects on purple sweet potato anthocyanin obviously;H2O2,Cu2+,Fe2+ had a greater impact on the stability of purple sweet potato anthocyanin.The solution of anthocyanin would become turbid with the effect of Cu2+ and Fe2+.

  19. 紫薯淀粉理化性质的研究%Study on the Physicochemical Properties of Purple Sweet Potato Starch

    Institute of Scientific and Technical Information of China (English)

    刘蒙; 曲智雅; 李小定; 范任海; 李杰; 张芸; 朱少华; 曲露; 王萌

    2013-01-01

    With starch extracted from purple sweet potato slag as raw material,this paper studied the chemical component,particle surface structure,crystal structure,gel texture,thermodynamic properties and rheological properties of the starch,comparing with the potato starch,corn starch and sweet potato starch at the same time.The main results and findings were summarized as follows:the starch content and amylose content of purple sweet potato starch were 98.78% and 19.74% respectively(dry weight) ;average particle size of the purple sweet potato starch granules was 17 μm,so the starch can be classified as medium size starch granule,and crystal form of type C;the starch gel showed a high springiness and chewiness,low hardness (3.095 × l02 g) and moderate viscosity (24.72 g · s) ; the gelatinization temperature scope was from 61.5 ℃ to 78.0 ℃,and the peak temperature was 72.6 ℃ ; the purple sweet potato slag starch paste was non-Newtonian fluid with yield stress.%以制得的紫薯淀粉为原料,研究了紫薯淀粉的化学组分、颗粒表面结构、结晶结构、凝胶质构、热力学性质和流变学特性,并与马铃薯淀粉、玉米淀粉和甘薯淀粉进行比较.结果显示:干基紫薯淀粉含量为98.78%,直链淀粉含量为19.74%;其淀粉颗粒平均粒径为17μm,属中粒淀粉,晶型为C型;淀粉凝胶弹性和咀嚼性高,硬度适中,为3.095×102 g,黏着性适中,为24.72 g·s;糊化温度范围为61.5℃到78.0℃,峰值温度为72.6℃;紫薯淀粉糊为有屈服应力的非牛顿型流体.

  20. Nutrition Indicators of Tenebrio Fed with Purple Sweet Potato Vine%饲喂紫红薯藤对黄粉虫营养指标的影响

    Institute of Scientific and Technical Information of China (English)

    温晓蕾; 郑国勇; 李汉臣; 吉志新; 侯东军; 李明媛; 张锐; 孟品品

    2012-01-01

    [目的]寻求新的黄粉虫(Tenebrio molitor L.)饲料资源及紫红薯藤的开发利用途径.[方法]在室内研究了不同比例的紫红薯藤对黄粉虫半干物质中粗蛋白、粗脂肪、钙、磷、粗灰分的含量及黄粉虫体重的影响.[结果]与对照全麦麸相比,采用紫红薯藤饲喂黄粉虫有利于黄粉虫半干物质中粗灰分、钙含量的增加,但不利于老熟幼虫体重及粗脂肪的积累,且随着紫红薯藤添加量的增加呈逐渐降低趋势.与对照相比,当紫红薯藤的添加量为40%时有利于粗蛋白的积累,且达到显著水平;当紫红薯藤的添加量超过20%时磷含量呈逐渐降低趋势.[结论]适量添加紫红薯藤能促进黄粉虫体内粗蛋白、粗灰分、钙、磷的积累,但不利于黄粉虫幼虫体重的增加,并直接影响粗脂肪的积累.%[ Objective ] To seek the new feed resources of Tenebrio molitor L. and the way of the development and utilization of purple sweet potato vine. [ Method] The crude protein, crude fat, Ca, P, crude ash, and weigh of Tenebrio molitor L. fed with different proportions of purple sweet potato vine were studied. [ Result] Compared with the control of whole wheat bran, feeding Tenebrio molito with purple sweet potato vine can increase the Ca and crude ash in the semi-dry matters of Tenebrio molitor, but goes against the accumulation of crude fat and weigh of Tenebrio molitor, and the content of crude ash and the weight of Tenebrio molitor were decreased gradually with the increasing addition of purple sweet potato vine. Compared with the control, 40% addition of purple sweet potato vine was beneficial to accumulation of crude protein. When the quantity of purple sweet potato vine was more than 20% , the phosphorus content was gradually decreased. [ Conclusion] The proper addition of purple sweet potato vine can increase the accumulation of crude protein, crude ash, Ca and P of Tenebrio molitor L. , but goes a-gainst the increase

  1. Study on Stability of Purple Sweet Potato Pigment%紫甘薯色素稳定性研究

    Institute of Scientific and Technical Information of China (English)

    张建立; 于阳

    2012-01-01

    对紫甘薯红色素的稳定性研究结果表明,光照会加快色素分解;温度升高破坏色素的稳定性,氧化剂H2O2和的存在对色素稳定性产生影响,H2O2浓度越大色素越不稳定;色素在还原剂Na2SO3的存在下稳定,在食品添加剂蔗糖和葡萄糖存在下稳定。在酸度呈中性的环境下稳定。%The research result of stability of purple sweet potato pigment show, light can speeding up pig- ment decomposes, temperature increasing can failure the stability of pigment, the existing of oxidant H2 O2 have effect to pigment stability, the pigment less stable with the concentration of HE02 increasing, under reducing agent NaESO3 existing, under food additive sucrose and glucose existing, the pigment is stable, when acidity show neutral environment, the pigment is stable also.

  2. Antioxidant Activity in Vitro of Lactic Acid Bacteria Fermented Purple Sweet Potato%紫甘薯乳酸发酵醪体外抗氧化性研究

    Institute of Scientific and Technical Information of China (English)

    徐长亮; 张村雪; 郭秋实; 汤琳

    2012-01-01

    Five different fermentation broths were prepared by fermentation of purple sweet potato, red-core sweet potato, red jujube, apple juice or apple pomace by lactic acid bacteria. The total antioxidant capacity and DPPH free radical scavenging capacity of the fermentation broths and purple sweet potato vinegar were tested. Lactic acid bacteria fermentation resulted in a slight increase in the antioxidant activity of purple sweet potato. The total antioxidant capacity was increased to 200.18 mg/mL. The DPPH radical scavenging rate of fermented purple sweet potato was 96.99% at the dosage of 100 IzL, which was comparable to that of purple sweet potato vinegar. Purple sweet potato fermentation broth exhibited the strongest antioxidant activity among the five fermentation broths.%测定5种乳酸发酵醪和紫甘薯醋的总抗氧化能力和对二苯代苦昧酰基(DPPH)自由基清除率,结果表明紫:甘薯乳酸发酵后抗氧化能力轻微增强,总抗氧化能力达200.18mg/mL,添加量为100μL时对DPPH自由基清除率达96.99%,与紫甘薯醋抗氧化能力相当。5种乳酸发酵醪中,紫甘薯乳酸发酵醪抗氧化能力最强。

  3. 紫薯南瓜凝固型酸奶发酵工艺研究%Research on Fermentation Technology of Purple Sweet Potato and Pumpkin Yoghourt

    Institute of Scientific and Technical Information of China (English)

    吴海燕; 邵元健; 李文婷

    2015-01-01

    Using purple sweet potato, pumpkin and milk as raw material, Lactic acid bacteria as leavening agents, the fermentation conditions of lactic acid fermented yoghourt were studied. The orthogonal experiments of L16(35) results showed that the optimize fermentation conditions were:the proportion of slurry and milk was 1 : 5 (g/mL),with the addition of sucrose 9 %, inoculums 0.7 %,fermentation time 5 hours, fermentation temperature 42 ℃. Under these conditions, the purple sweet potato and pumpkin yoghourt took on well-distributed quality, smooth, flour and sweet delicious taste with purple sweet potato and pumpkin fragrance, full-bodied scent of yoghourt coming from lactic fermentation. Both physiochemical indexes and microbial indexes complied with national standards.%以紫薯、南瓜、牛奶为主要原料,利用乳酸菌进行发酵,得到一种风味酸奶.通过L 16(3 5)正交试验优化发酵工艺条件,最佳发酵条件为:紫薯---南瓜浆与牛乳的比例为1:5(g/mL),蔗糖添加量为9%,菌种接种量为0.7%,发酵时间为5 h,发酵温度42℃.在该条件下制成酸奶质地均匀,口感细腻,酸甜可口,具有紫薯、南瓜的香味和浓郁的乳酸菌发酵酸奶香味,理化指标和微生物指标均符合国家标准.

  4. 紫甘薯浓缩汁的流变特性研究%Study on the Rheological Properties of Concentrated Purple Sweet Potato juice

    Institute of Scientific and Technical Information of China (English)

    张涛; 吕晓玲; 李津; 杨雪吟

    2012-01-01

    Rheological properties of Purple Sweet Potato concentrated juice were studied at different temperature(25 ℃,50 ℃,75 ℃) and different concentration(10°Brix,20°Brix,30°Brix,40°Brix,50°Brix,60°Brix) by the rheometer CV-Ⅲ+.The results showed that within the study of temperature and concentration framework,the purple sweet potato concentrated juice was the Newtonian fluid;Through regression analysis showed that: the effect of temperature on viscosity could be described by Arrhenius type equation,the effect of concentration on viscosity could be described by an Index type equation;and the equation used to describe combined effect of temperature and concentration on viscosity of concentrated purple sweet potato juice was established.%采用CV-Ⅲ+型数字流变仪对不同温度(25℃,50℃,75℃)和不同浓度(10°Brix,20°Brix,30°Brix,40°Brix,50°Brix,60°Brix)下的紫甘薯浓缩汁的流变特性进行了研究,结果表明:在所研究的温度和浓度范围内,紫甘薯浓缩汁为牛顿流体;回归分析表明,温度对粘度的影响符合Arrhenius方程,浓度对粘度的影响可以用指数方程更准确的表示,并依此推导并验证了温度和浓度对紫甘薯浓缩汁粘度综合影响的方程模型。

  5. 速煮紫薯丁的干燥方法研究%Research on drying process of quick-cooked purple sweet potato

    Institute of Scientific and Technical Information of China (English)

    卢馨; 莫丽春; 曾凡骏; 曾里

    2013-01-01

    通过对比热风干燥、真空干燥、冷冻加热风干燥对速煮紫薯丁的品质影响,选择适合速煮紫薯丁的干燥方法,并对其进行优化.结果表明:(1)采用热风干燥的工艺生产的速煮紫薯丁品质优于其他方法.原料经处理后,先90℃热风干燥2.5h至水分质量分数30%,再70℃热风干燥4h至水分质量分数10%,制成的速煮紫薯丁具有良好的复水性,花青素保留率也较高;(2)在相同干燥温度条件下,花青素保留率随水分的降低而降低;(3)速煮紫薯丁干燥水分临界点为质量分数30%.%Through the comparison of hot air drying, vacuum drying, with freezing and hot air drying on the quality of quick-cooked purple sweet potato, the suitable drying method was selected and optimized. The results showed that: the quality of quick-cooked purple sweet potato by hot air drying was better than that by the other methods. The raw meterial was treated, and dried for 2. 5 h at 90℃ to the moisture content of 30% ,then dried for 4 h to the moisture content of 10% , the quick-cooked purple sweet potato produced had high anthocyanin retention rate and good rehydration;in the same drying temperature conditions, anthocyanin retention rate decreased with moisture content reducing; the moisture critical point of quick-cooked purple sweet potato was 30%.

  6. Functional characterization of Dihydroflavonol-4-reductase in anthocyanin biosynthesis of purple sweet potato underlies the direct evidence of anthocyanins function against abiotic stresses.

    Science.gov (United States)

    Wang, Hongxia; Fan, Weijuan; Li, Hong; Yang, Jun; Huang, Jirong; Zhang, Peng

    2013-01-01

    Dihydroflavonol-4-reductase (DFR) is a key enzyme in the catalysis of the stereospecific reduction of dihydroflavonols to leucoanthocyanidins in anthocyanin biosynthesis. In the purple sweet potato (Ipomoea batatas Lam.) cv. Ayamurasaki, expression of the IbDFR gene was strongly associated with anthocyanin accumulation in leaves, stems and roots. Overexpression of the IbDFR in Arabidopsis tt3 mutants fully complemented the pigmentation phenotype of the seed coat, cotyledon and hypocotyl. Downregulation of IbDFR expression in transgenic sweet potato (DFRi) using an RNAi approach dramatically reduced anthocyanin accumulation in young leaves, stems and storage roots. In contrast, the increase of flavonols quercetin-3-O-hexose-hexoside and quercetin-3-O-glucoside in the leaves and roots of DFRi plants is significant. Therefore, the metabolic pathway channeled greater flavonol influx in the DFRi plants when their anthocyanin and proanthocyanidin accumulation were decreased. These plants also displayed reduced antioxidant capacity compared to the wild type. After 24 h of cold treatment and 2 h recovery, the wild-type plants were almost fully restored to the initial phenotype compared to the slower recovery of DFRi plants, in which the levels of electrolyte leakage and hydrogen peroxide accumulation were dramatically increased. These results provide direct evidence of anthocyanins function in the protection against oxidative stress in the sweet potato. The molecular characterization of the IbDFR gene in the sweet potato not only confirms its important roles in flavonoid metabolism but also supports the protective function of anthocyanins of enhanced scavenging of reactive oxygen radicals in plants under stressful conditions.

  7. Research and Progress about Anthocyanins of Purple-Fleshed Sweet Potatoes%甘薯紫色素及提取技术研究进展

    Institute of Scientific and Technical Information of China (English)

    肖海峻; 施鹏飞; 杨新建; 田璐; 王伟青

    2014-01-01

    Purple fleshed sweet potatoes are ant hocyanin rich foods. Anthocyanin pigments of purple fleshed sweet potatoes show functions of anti oxidation and antimutagenicity , they also can prevent carbon tetrachloride induced acute liver dam age in t he rat and reduce the risk of coronary heart disease. The advantages and disadvantages of extracting methods such as organic solvent method and microwave and ultrasonic and the best technological parameter are summarized in this paper, and the results showed that microwave method are the best way according to the productivity.%紫薯色素主要含花青素类色素,它具有抗氧化、抗突变、减轻肝机能障碍与心血管疾病等作用。本文综述了紫薯色素的有机溶剂提取法、超声辅助提取法、微波提取法各自有缺点及最佳提取工艺参数以及产率的大小,综合分析认为微波提取法效果最好。

  8. Fermentation Technology for Purple Sweet Potato Juice Soybean Yoghurt%发酵型紫薯大豆酸奶的研制

    Institute of Scientific and Technical Information of China (English)

    王新惠; 白婷; 张崟; 王国燕; 李俊霞; 邓晓燕; 罗静; 张庆

    2015-01-01

    以紫薯和黄豆为主要原料,选用嗜热链球菌(Streptococcus thermophiles 6038)和德氏乳酸杆菌保加利亚亚种(Lactobacillus delbrueckii subsp.bulgaricus),以1∶1混合作为发酵剂进行发酵,以感官评价为参考指标,确定紫薯大豆酸奶工艺参数。结果表明,紫薯大豆酸奶最佳工艺参数为:紫薯浆添加量8%、蔗糖添加量9%、接种量3%、发酵温度38℃、发酵时间8 h。在此条件下发酵的紫薯大豆酸奶,色泽呈均匀香芋色,口感细腻,酸奶特殊香气及紫薯味浓郁,酸甜适中,可溶性固形物≥10%,蛋白质含量≥2.9%,pH 4.6,酸度59°T,菌落总数3.1×107 cfu/mL,乳酸菌数2.8×107 cfu/mL,未检测出大肠杆菌和致病菌,其质量达到GB19302-2010《食品安全国家标准发酵乳》对酸奶的指标要求。%A new fermentation technology for solidification fermented soy milk prepared with purple sweet potato juice was investigated. The purple potatoes and soy milk were considered as raw materials and the mixture of Streptococcus thermophiles 6038 and Lactobacillus delbrueckii subsp.bulgaricus (1 ∶ 1) was selected as culture starters for preparation new flavor soybean yoghurt. The sensory evaluation was used as the index and the optimal fermentation technology of purple sweet potato juice soybean yoghurt was determined. The results showed that the best purple sweet potato soybean yogurt fermentation process parameters were as purple sweet potato juice addition 8 %, sugar addition 9 %, inoculation 3 %, fermentation temperature 38 ℃ and fermentation time 8 h. The healthcare yoghurt obtained was featured by uniform color , nice texture and smooth taste. Furthermore, the results showed that the quality of soybean yoghurt was as soluble solids≥10%, protein content≥2.9%, pH 4.6, the acidity of 59 °T, total number of colonies 3.1×107 cfu/mL and number of lactic acid bacteria 2.8×107 cfu/mL without E.coli and pathogenic

  9. Study on stability of anthocyanins from purple sweet potato%紫薯花色苷的理化性质研究

    Institute of Scientific and Technical Information of China (English)

    杨颖; 夏其乐; 陈剑兵; 邢建荣; 陆胜民

    2009-01-01

    对紫薯花色苷的理化性质进行了研究,结果表明,其在中性偏酸的条件下呈现鲜艳的红色或悦目的紫色;对H_2O_2、Na_2SO_3以及光线表现出不稳定性;水溶液具有色泽或者氧化还原性的金属离子也会影响其色泽;具有良好的热稳定性;对于常用的食品添加剂如蔗糖、NaCl、防腐剂等具有良好的配伍稳定性;具备良好的贮藏稳定性,常温避光的情况下能放置5个月无明显变化,紫薯花色苷是优良的天然色素来源.%The physical and chemical stability of anthocyanins from purple sweet potato was studied in this paper. The results indicated that anthocyanins solution displayed flamboyant red and lightly purple color in acidic pl-conditions.The color of anthocyanins solution was slightly changed by Cu~(2+).And the pigment was decomposed by H_2O_2, Na_2SO_3, Fe~(2+) and Fe~(3+) through oxidization and reduction.They showed nice stability to thermal and commor used food additives, such as sugar, NaCl and preservatives, and retained the highest content for 5 months at roorr temperature when stored in dark.Anthocyanins from purple sweet potato were perfect pigment of natural resource.

  10. Microwave extraction and stability of purple sweet potato pigment and antioxidant activity%紫薯色素的微波提取及其稳定性和抗氧化活性的研究

    Institute of Scientific and Technical Information of China (English)

    余凡; 杨恒拓; 葛亚龙; 田光辉

    2013-01-01

    The extraction and stability of the pigment of the purple sweet potato were studied. Microwave extraction method,select the proportion of solvent,time,temperature,solid-liquid ratio as the extraction of factors, single-factor experiments and L9(34) orthogonal experiment to explore the extraction process of the pigment in the purple sweet potato. The effect of pH,temperature,different metal ions,oxidizing agents reducing agent,the impact of different food additives and other factors on the stability of the pigment of the purple sweet potato,and purple sweet potato pigment oxidation resistance were studied. The result showed that:purple sweet potato pigments with maximum absorption peak at 450nm,the mass fraction of 10% citric acid solution,the temperature of 30℃,the power of 75W,time of 15min,solid to liquid ratio of 1:15,purple sweet potato pigment the extraction rate was higher,the pigment of the purple sweet potato better stability,and had a strong antioxidant activity.%研究了紫薯色素的提取方法及其稳定性.采用微波提取法,选取溶剂比例、时间、温度、料液比作为提取因素,进行单因素实验和L9(34)正交实验,探讨紫薯中色素的提取工艺,考察了pH、温度、不同金属离子、氧化剂还原剂、不同的食品添加剂等因素对紫薯色素的稳定性的影响,并对紫薯色素的抗氧化性进行了研究.结果表明:紫薯色素在450nm处有最大吸收峰,用质量分数10%的柠檬酸溶液提取,温度为30℃,功率为75W,时间为15min,料液比为1∶15时,紫薯色素的提取率达到较高.值此时,紫薯色素有较好的稳定性,且具有较强的抗氧化活性.

  11. 紫甘薯提取物对果蝇的紫外辐射保护作用%Protective Effect of Extract from Purple Sweet Potatoes on Drosophila melanogaster Damaged by UV

    Institute of Scientific and Technical Information of China (English)

    李津; 吕晓玲; 王婷婷; 杨雪吟

    2012-01-01

    研究紫外线诱导后(20 W紫外灯下照射40 min)紫甘薯提取物对果蝇辐射损伤的保护作用.在紫外线氧化损伤果蝇模型中添加紫甘薯提取物后,果蝇寿命显著提高,且有剂量依赖性.紫甘薯提取物提高了紫外线氧化损伤果蝇体内的超氧化物歧化酶(SOD)比活力和过氧化氢酶(CAT)比活力,降低了丙二醛(MDA)水平.说明紫甘薯提取物具有抗氧化损伤、延缓衰老的作用,为紫甘薯提取物更好地应用于营养食品、保健食品中提供理论依据.%The protective effect of extract from purple sweet potatoes on Drosophila melanogaster damaged by UV (20 W, 40 min) was studied. An oxidative damaged model of Drosophila melanogaster,damaged by UV,was established. The life-spans of Drosophila melanogaster were obviously increased after adding the extract from purple sweet potatoes in the model. The extract from purple sweet potatoes could also enhance the activities ofSOD,CAT, and decrease the level of MD A of the UV damaged model, which suggests that the extract from purple sweet potatoes has some antioxidative effect on Drosophila melanogaster. The result of this reasearch can provide a theoretical basis when the extract from purple sweet potatoes is applied to food and medicine.

  12. Vacuum freeze-drying progress of purple sweet potato leaves%真空冷冻干燥紫甘薯叶的工艺研究

    Institute of Scientific and Technical Information of China (English)

    孙莉; 蒲传奋; 姜文利; 张岩; 杜善词; 王世清

    2012-01-01

    为了对采后紫甘薯叶进行充分的开发利用,提高农副产品的附加值及利用率,研究了紫甘薯叶真空冷冻干燥的最佳工艺参数。以冻干后紫甘薯叶的含水量为指标,利用正交试验对冻干过程的3个阶段进行了分析。并以色差变化为指标,采用正交试验研究了紫甘薯叶的最佳护色条件。研究表明:紫甘薯叶真空冷冻干燥最佳工艺过程为:预冻3h,升华干燥8h,解析干燥2h;最佳护色条件为:护色剂ZnCI2、质量浓度500mg/L、温度70℃、时N30s。%The best parameters of purple sweet potato leaves were studied by using vacuum freeze-drying technology in this paper, the water content of the purple sweet potato leaves after the freeze-drying was as an indicator, the three stages of freeze-drying process were analyzed by orthogonal experiment; the color change was as an indicator, the best conditions of color protection was studied through orthogonal experiment. The results showed that: the best vacuum freeze-drying process of purple sweet potato leaves as follow: the pre-freeze time was 3 h, the sublimation drying time was 8 h, the analytical drying time was 2 h; the best conditions of color protection as follow: the color fixative was ZnCI2, the density was 500 mg/L, temperature was 70 %, time was 30 s.

  13. Caffeoylquinic acid-rich purple sweet potato extract, with or without anthocyanin, imparts neuroprotection and contributes to the improvement of spatial learning and memory of SAMP8 mouse.

    Science.gov (United States)

    Sasaki, Kazunori; Han, Junkyu; Shimozono, Hidetoshi; Villareal, Myra O; Isoda, Hiroko

    2013-05-29

    The effects of caffeoylquinic acid (CQA)-rich purple sweet potato (PSP) extract, with (PSPEa) or without (PSPEb) anthocyanin, on the improvement of spatial learning and memory of senescence-accelerated prone mouse strain (SAMP) 8 was determined. SAMP8 was treated with 20 mg/kg/day of PSPEa or PSPEb for 30 days. The effect on spatial learning and memory and the molecular mechanism of this effect were determined in vivo (SAMP8) and in vitro (SH-SY5Y cells). PSPEa or PSPEb reduced the escape latency time of SAMP8 by 17.0 ± 8.0 and 14.2 ± 5.8 s (P improve the spatial learning and memory of SAMP8.

  14. Influence of Blanching Treatment on Purple Sweet Potato during Microwave%热烫对微波干燥紫薯片品质的影响

    Institute of Scientific and Technical Information of China (English)

    胡洋; 陈艳; 陈金日; 叶欣; 冉旭

    2012-01-01

    热烫处理是微波干燥紫薯片的预处理过程,通过测定热烫处理后紫薯片中花色苷的含量、色值、质构以及微观结构,研究不同热烫时间(0min,1min,3min,5min)对紫著片品质的影响。结果表明,热烫时间为3min的紫薯微波干燥后花色苷含量最多,体内结构匀称,横断面更好,热烫时间为0min的紫薯干燥后的硬度,胶黏性与咀嚼性最大,而不同热烫时间处理的紫薯干燥后的黏性,弹性,黏聚性,回复性等物性差异不大。%Blanching treatment was the pro-treatment in the process of microwave drying purple sweet potato slice. In order to understand the influence of different blanching time (0 min, 1 min, 3 min, 5 min) on purple sweet potato, the content of anthocyanin, color value, texture and microstructure were detected. Results showed that the content of anthocyanin was more; the texture was more uniform when the blanching time was 3 min. However, when the blanching time was 0 min, the hardness, tackiness and chewiness was more. There were no difference between stickiness, springiness, cohesiveness, resilience and blanching time.

  15. Study on the physicochemical properties of purple sweet potato starch%紫薯淀粉理化性质的研究

    Institute of Scientific and Technical Information of China (English)

    单珊; 周惠明; 朱科学

    2011-01-01

    紫薯富含硒元素和花青素,已广泛应用于食品加工.淀粉是紫薯的主要成分,其理化特性对紫薯加工品质有重要的影响.以川山紫鲜薯为原料制备紫薯淀粉,通过对比研究表明:薯类淀粉中紫薯淀粉糊化温度高,热稳定性和凝胶性好;而膨润性与溶解性差,透明度低,易回生.%Purple sweet potato (PSP) is rich in selenium and anthocyanins, which has been widely used in food processing.The physicochemical properties of PSP starch have a significant impact on PSP processing quality. Using PSP(Chuanshanzi)as raw material to produce PSP starch, compared with other kinds of potato starches, the results showed that PSP starch had a higher gelatinization temperature, better thermal stability and gel strength, but was poorer in the properties of swelling and solubility and transparency, and was apt to retrogradation.

  16. Chemical composition analysis of sweet purple potato juice during processing%加工过程中紫薯汁化学成分变化分析

    Institute of Scientific and Technical Information of China (English)

    万玉炜; 牛丽影; 陈计峦

    2015-01-01

    In order to research the influence on purple potato juice' s quality during processing,the fresh purple potatoes were sliced,color fixated,blanched,enzymolysis,and pasteurized or autoclaving sterilized.Free amino acids,free sugars,total anthocyanidin and soluble protein content were analyzed after squeezing.Results showed that free amino acids,free sugars and anthocyanidin reduced significantly after color fixing and blanching treatment.However enzymolysis increased the contents of them in juice.In addition,both pasteurization and autoclaving sterilization could reduce the content of free amino acids,free sugars and anthocyanidin in purple sweet potato juice,while more compositions were lost by autoclaving sterilization than pasteurization.Moreover the water-soluble protein decreased during the processing,and only 20 % of fixed color remained after hot blanching.%为探讨加工过程对紫薯汁品质的影响,对紫薯汁加工中护色、烫漂、酶解、灭菌过程中游离氨基酸、游离糖、花青素、可溶性蛋白含量变化进行了测定.结果表明:护色和烫漂可导致游离氨基酸、游离糖、花青素损失,但是酶解过程会使紫薯汁中的游离氨基酸、游离糖、花青素增加.杀菌过程中,无论是巴氏杀菌还是高压蒸汽灭菌均可造成花青素、游离糖、游离氨基酸含量降低,但高压蒸汽灭菌造成的损失高于巴氏杀菌.水溶性蛋白在加工过程中整体呈下降趋势,尤其是热烫处理后降低为护色后的20%.

  17. Study on the Milk Beverage with Purple Sweet Potato%紫薯乳饮料的研制

    Institute of Scientific and Technical Information of China (English)

    师文添

    2015-01-01

    In this paper, a kind of milk beverage was studied, and the optimal formula and technology which were ascertained by orthogonal experiments were as follows:purple sweet juice 6%, white sugar 5%, defatted milk powder 3%, compound stabilizing agent which were made with 0.1%agaropectin , 0.1%xanthan gum and 0.1 % CMC, compound colour fixatives which were made with 0.05 % vitamin C,0.1 % citric acid and 1.0%salt, homogenizing pressure 18 MPa, homogenizing temperature 60℃.%对紫薯乳饮料配方和工艺进行了研究,经正交试验确定紫薯乳饮料的最佳配方为:6%的紫薯汁﹑5%的白砂糖﹑3%的脱脂奶粉﹑复合稳定剂为0.1%琼脂、0.1%黄原胶和0.1%CMC,产品加工工艺的最佳组合是:护色剂为0.05%VC与0.1%柠檬酸和1.0%食盐的溶液、均质压力18 MPa﹑均质温度60℃。

  18. 保加利亚乳杆菌和嗜热链球菌发酵紫红薯酸牛奶%Purple sweet potatoes yoghurt fermented by Lactobacillus bulgaricus and Streptococcus thermophilus

    Institute of Scientific and Technical Information of China (English)

    卢兆芸; 陈海婴; 彭冬英; 段学辉; 胡泽红

    2011-01-01

    研究以鲜牛奶和紫红薯为主要原料,保加利亚乳杆菌(Lactobacillus bulgaricus)与嗜热链球菌(Streptococcus thermophilus)为发酵剂,木糖醇为甜味剂,进行了发酵条件的平行和L9(34)正交试验.结果表明,保加利亚乳杆菌与嗜热链球菌混合量比1∶1(数量比),接种量5%,紫红薯添加量15%,木糖醇10%,果胶0.1%,明胶0.1%,CMC 0.1%,变性淀粉0.5%,45℃,发酵4h,制得的紫红薯酸牛奶不仅保留纯酸牛奶的芳香和口感,又具备紫红薯的营养和色泽,是新型紫红薯营养酸奶发酵的优化工艺.%A new type of yoghurt, a clabber mile with the purple sweet potatoes fermented by Lactobadllus bulgaricus and Streptococcus ther-mophilus was studied. The orthogonal experiments of L9(34)results showed that, the optimize fermentation conditions and additive compositions of purple sweet potatoes yoghurt were: purple sweet potatoes 15%, sweeter xylitol 10%, inoculate strain 5%, 45 ℃, fermentation time 4 hours. The dairy products fermented with best nutrition and flavor of yoghurt, and keep the natural colour of purple sweet potatoes.

  19. 加工方法对紫甘薯花色苷含量及组成的影响%Effectsof Processing Technique on Anthocyanin Composition and Content of Purple Sweet Potato

    Institute of Scientific and Technical Information of China (English)

    王晰锐; 张超; 马越; 江连洲; 赵晓燕

    2011-01-01

    Objective: Effects of roasting, frying, and steaming treatments on the anthocyanin composition and content of purple sweet potato were evaluated. Methods: The anthocyanin content and compositions of the purple sweet potato was detected by HPLC-MS. Results: Each treatment decreased the anthocyanin content. The anthocyanin residual rate in purple sweet potato treated by frying, steaming, and roasting were 93.7%, 87.1%, and 60.0%, respectively. Moreover, the diacylated anthocyanin showed a stronger stability than the acylated ones. The stability of the caffeoyl anthocyanin was stronger than that of the phydroxybenzoyl anthocyanin. Conclusion: The frying and steaming were effective to hold the anthocyanin content of the purple sweet potato.%目的:研究烤、炸和蒸3种加工方法对紫甘薯花色苷的影响.方法:采用HPLC-MS法测定3种加工方法对紫甘薯花色苷含量及其组成的变化.结果:3种加工方法均可降低紫甘薯花色苷含量,其花色苷残余率:炸薯93.7%,蒸薯87.1%和烤薯60.0%.紫甘薯中双酰化的花色苷稳定性高于单酰化花色苷,咖啡酸酰化的花色苷组分稳定性高于对羟基苯甲酸酰化花色苷.结论:炸和蒸加工方法可有效维持紫甘薯花色苷含量.

  20. 绿原酸对紫薯花色苷的辅色作用研究%Studies on Copigmentation Effect of Chlorogenic Acid on Purple Sweet Potato Anthocyanins

    Institute of Scientific and Technical Information of China (English)

    闫征; 李春阳

    2012-01-01

    为研究绿原酸对紫薯花色苷的辅色稳定作用,本试验采用可见吸收光谱和液质联用色谱(HPLC-MS)法研究了绿原酸不同添加浓度、pH值和温度对紫薯花色苷的最大吸收波长和最大吸光度及花色苷成分的影响,比较了绿原酸辅色前后花色苷的热稳定性.结果表明,绿原酸对紫薯花色苷产生了增色效应和红移效应,辅色效应随绿原酸浓度的增大而增强,最适辅色pH值为3.5,绿原酸辅色后紫薯花色苷的组成不变,花色苷热稳定性增强.%To study the copigmentation of purple sweet potato anthocyanins( PSPA)with chlorogenic acid( CA) ,the effect of different chlorogenic acid concentrations and pH values on the wavelength of maximum absorbance,maximum absorbance value and anthocyanins components were investigated using visible absorption spectra and HPLC-MS. Color thermal stability of purple sweet potato anthocyanins before and after chlorogenic acid application were observed. Alter chlorogenic acid added,the hyperchromic effect and bathochromic effect on purple sweet potato anthocyanins presented. The copigmentation effect became stronger with the increase of added chlorogenic acid concentration. The optimum pH value for copigmentation was 3. 5. After chlorogenic acid added, the compositions of purple sweet potato anthocyanins did not changed,and the thermal stability of anthocyanins was enhanced.

  1. Study on the stability of anthocyanin in purple sweet potato beverage%紫甘薯饮料中花青素的稳定性研究

    Institute of Scientific and Technical Information of China (English)

    孙鹏尧; 周芳宁; 李喜层; 曹燕华; 袁素辉; 牟德华

    2014-01-01

    The spectrum characteristics of anthocyanins in purple sweet potato beverage with different pH was analyzed, besides, the effect of pH, temperature, Vc, sugar, and light on the stability of anthocyanin from purple sweet potato beverage were studied. The results showed that the anthocyanins had better stability at the pH of 2.2, 3.0, 4.0. The stability gradually decreased along with the pH increased. High temperature had obvious effect on the stability of purple sweet potato antho-cyanins and the higher the temperature was, the lower retention of anthocyanin had. Vc could accelerate the degradation of anthocyanins. Glucose and lactose had no effect on the stability of anthocyanins. Clathrate which formed of Fe3+and antho-cyan might reduce the stability of anthocyanins, however, other metal ions had no influence almost. The stability of antho-cyanins decreased under the light. Natural light had no obvious impact in a short period of time. Incandescent light and ul-traviolet lamp could speed up decomposition of anthocyanin.%研究了不同pH值紫甘薯饮料中花青素的色泽光谱特性以及pH值、温度、抗坏血酸、糖、光照等因素对紫甘薯饮料中花青素稳定性的影响。结果表明, pH值为2.2、3.0、4.0时花青素较稳定,随着pH值的升高,稳定性逐渐降低;高温处理对紫甘薯花青素的稳定性的影响较显著,温度越高,花青素的保留率越低;抗坏血酸的加入会加速花色苷的降解;葡萄糖和乳糖的加入对花色苷的稳定性无影响; Fe3+与花青素类物质形成络合物,降低了花青素的稳定性,其他的金属离子对花色苷的稳定性影响不大;光照使花青素稳定性降低,自然光在短时间内影响较小,花色苷在白炽灯和紫外灯照射下降解速度加快。

  2. Influence of different transplanting density of purple sweet potato on introduction production%不同栽插密度对紫色甘薯引种产量的影响试验

    Institute of Scientific and Technical Information of China (English)

    吴家丽; 牛力立; 杨平

    2015-01-01

    The adaptability, yield and appropriate density of Anhui purple sweet potato (Ipomoea batatas Poir) in central Guizhou were researched in order to provide scientific basis for the planting of purple sweet potato in Guizhou and similar ecological area. The results showed that plant traits, tuber number and yield of purple sweet potato had the similar changing trend. Yield presented the trend of first increasing and then decreasing. The best planting density was 4 896 plants/667 m2 and obtained the highest yield (P<0.01).%研究安徽紫色甘薯(Ipomoea batatas Poir)在黔中地区的引种适应性和丰产性,并筛选出适宜的栽插密度,为紫色甘薯在黔中及生态类似地区大面积生产种植提供科学依据。结果表明:紫色甘薯植株性状、结薯数变化趋势与产量呈一致性,产量随栽插密度增加呈现出先升后降的趋势,最佳栽插密度为4896株/667 m2获得最高产量(P<0.01)。

  3. Purple Sweet Potato Color Ameliorates Cognition Deficits and Attenuates Oxidative Damage and Inflammation in Aging Mouse Brain Induced by D-Galactose

    Directory of Open Access Journals (Sweden)

    Qun Shan

    2009-01-01

    Full Text Available Purple sweet potato color (PSPC, a naturally occurring anthocyanin, has a powerful antioxidant activity in vitro and in vivo. This study explores whether PSPC has the neuroprotective effect on the aging mouse brain induced by D-galactose (D-gal. The mice administrated with PSPC (100 mg/kg.day, 4 weeks, from 9th week via oral gavage showed significantly improved behavior performance in the open field and passive avoidance test compared with D-gal-treated mice (500 mg/kg.day, 8 weeks. We further investigate the mechanism involved in neuroprotective effects of PSPC on mouse brain. Interestingly, we found, PSPC decreased the expression level of glial fibrillary acidic protein (GFAP, inducible nitric oxide synthase (iNOS, and cyclooxygenase-2 (COX-2, inhibited nuclear translocation of nuclear factor-kappaB (NF-κB, increased the activity of copper/zinc superoxide dismutase (Cu/Zn-SOD and catalase (CAT, and reduced the content of malondialdehyde (MDA, respectively. Our data suggested that PSPC attenuated D-gal-induced cognitive impairment partly via enhancing the antioxidant and anti-inflammatory capacity.

  4. HPLC-DAD-ESI-MS(2) analytical profile of extracts obtained from purple sweet potato after green ultrasound-assisted extraction.

    Science.gov (United States)

    Zhu, Zhenzhou; Guan, Qingyan; Koubaa, Mohamed; Barba, Francisco J; Roohinejad, Shahin; Cravotto, Giancarlo; Yang, Xinsun; Li, Shuyi; He, Jingren

    2017-01-15

    Ultrasound pre-treatment (UAE) was applied to assist the extraction of valuable compounds (polyphenols (especially anthocyanins), and proteins) from purple sweet potato (PSP). Under optimum conditions (ultrasound time (40min); supplementary hot extraction (80°C) up to 120min; pH: 2.5; ethanol concentration: 58%), the highest concentrations of polyphenols (3.877mg/g), anthocyanins (0.293mg/g), and proteins (0.753mg/g) were found, with minimal specific energy consumption (8406J/mg). Moreover, anthocyanin and non-anthocyanin polyphenols in PSP extract from optimized extraction temperature were identified using HPLC-DAD-ESI-MS(2). The major identified anthocyanins were peonidin-3-caffeoyl-p-hydroxybenzoyl sophoroside-5-glucoside, peonidin-3-(6″-caffeoyl-6‴-feruloyl sophoroside)-5-glucoside, cyanidin-3-caffeoyl-p-hydroxybenzoyl sophoroside-5-glucoside, whereas the major identified non-anthocyanin molecules were quinic acid, chlorogenic acid, caffeic acid, and chlorogenic acid-3-glucose. The amount of the predominant anthocyanin and non-anthocyanin compounds from PSP extract obtained after UAE was higher than that extracted after conventional solvent extraction. The results obtained in this work demonstrated the efficiency of UAE for the recovery of anthocyanins from PSP.

  5. PENGARUH PENGOLAHAN PANAS TERHADAP KONSENTRASI ANTOSIANIN MONOMERIK UBI JALAR UNGU (Ipomoea batatas L (Efect of Heat Processing on Monomeric Anthocyanin of Purple Sweet Potato (Ipomoea batatas L

    Directory of Open Access Journals (Sweden)

    Ai Mahmudatussa'adah

    2015-09-01

    content in PSP during heat processing of flakes. The other purpose of this reseach was to observe the order kinetics model of effect temperature and time baking on total anthocyanin monomeric of fresh PSP and rehydration PSP flakes. The experimental applied a completely randomized design with three replications. The color and amount of anthocyanin (L * = 23.38 ± 0.71, C = 9.84 ± 0.98, Hue = 12.25 ± 1.61. Total monomeric anthocyanin in fresh PSP was 1.45 ± 0.00 mg cyanidin equivalent (CyE/g dry basis (db. In general, the color and the amount of PSP anthocyanin changed during the flakes processing. Steamed PSP for 7 minutes turned its color into a bright purple (L * = 25.88 ± 0.47, C = 24.64 ± 0.25, Hue = 348.83 ± 0.33 with the amount of monomeric anthocyanin increased to 3.76 ± 0.01 CyE mg/g db. Flakes PSP was very bright purple (L * = 36.12 ± 0.11, C = 9.97 ± 0.18, Hue = 359.29 ± 0.31 and the amount of monomericanthocyanin was slightly lower than that of steamed sweet potato (3.19 ± 0.12 mg CyE / g db. Total monomeric anthocyanin of fresh PSP and rehydration flakes PSP decrease during baking time. Keywords: Color, anthocyanin, purple sweet potato, flakes, degradation kinetics   ABSTRAK Antosianin merupakan salah satu kelompok zat warna alami yang terdapat pada tanaman, seperti daun, bunga, umbi, buah atau sayur. Salah satu sumber antosianin pada tanaman adalah ubi jalar ungu (UJU yang mengandung lebih dari 98% antosianin terasilasi dari konsentrasi antosianin umbi. Warna antosianin bervariasi mulai dari merah, ungu, biru, sampai kuning. Warna dan konsentrasi antosianin dapat berubah karena pengaruh panas. Penelitian ini bertujuan untuk mempelajari perubahan warna dan konsentrasi antosianin monomerik sebagai akibat proses pengolahan dalam pembuatan  UJU. Penelitian ini mengkaji juga mengenai model kinetika reaksi pengaruh suhu dan waktu panggang terhadap konsentrasi antosianin UJU segar dan  rehidrasi. Penelitian menggunakan rancangan acak lengkap

  6. Consumption of purple sweet potato leaves modulates human immune response: T-lymphocyte functions, lytic activity of natural killer cell and antibody production

    Institute of Scientific and Technical Information of China (English)

    Chiao-Ming Chen; Sing-Chung Li; Ya-Ling Lin; Ching-Yun Hsu; Ming-Jer Shieh; Jen-Fang Liu

    2005-01-01

    AIM: To study the immunological effects of physiological doses of purple sweet potato leaves (PSPL).METHODS: The randomized crossover study (two periods,each lasting for 2 wk) involved 16 healthy non-smoking adults of normal weight. The 6-wk study consisted of a run-in (wk 1) PSPL diet (daily consumption of 200 g PSPL) or a control diet (low polyphenols, with the amount of carotenoids adjusted to the same level as that of PSPL) (wk 2-3), washout diet (wk 4), and switched diet (wk 5-6). Fasting blood was collected weekly in the morning. T-lymphocyte function was assessed via the proliferation and secretion of immunoreactive cytokines.Salivary IgA secretion and the specific cytotoxic activities of cytotoxic T lymphocytes and natural killer (NK) cells were determined.RESULTS: The plasma β-carotene level increased with time in both groups, while the plasma polyphenol level decreased in the control group, and no significant difference was detected between the two groups.Although plasma polyphenol levels did not significantly increase in the PSPL group at the end of the study, they were significantly elevated in urine. PSPL consumption produced a significant increase in proliferation responsiveness of peripheral blood mononuclear cells (PBMC) and their secretion of immunoreactive IL-2 and IL-4. As well, lytic activity in NK cells was elevated in a time-dependent fashion. Salivary TgA secretion significantly decreased in control group after 2 wk, and returned to baseline following dietary switch to PSPL.CONCLUSION: Consumption of PSPL modulates various immune functions including increased proliferation responsiveness of PBMC, secretion of cytokines IL-2 and IL-4, and the lytic activity of NK cells. The responsible determinants of PSPL remain to be elucidated, as does the biological significance of the present observations.

  7. 紫心甘薯、黑莓、苹果复合果蔬汁的研制%Preparation of mixed beverage from purple sweet potato, blackberry and apple

    Institute of Scientific and Technical Information of China (English)

    闫征; 李春阳; 王乃富; 黄午阳

    2011-01-01

    [目的]确定紫心甘薯、黑莓、苹果复合果蔬汁的最佳配方及稳定剂的选择与用量,研制出风味独特、营养健康的新型复合果蔬汁饮料.[方法]通过3因素3水平正交试验结合感官评定确定复合果蔬汁的最佳配方,比较不同稳定剂对复合果蔬汁稳定性的影响,并测定复合果蔬汁的主要营养成分.[结果]复合果蔬汁最佳配方为:紫心甘薯汁、黑莓汁、苹果汁的体积配比为5:3:2,蔗糖30 g/L,并添加1.2 g/L耐酸性羧甲基纤维素钠(CMC-Na).[结论]以紫心甘薯汁、黑莓汁、苹果汁混合制备复合果蔬汁,能使糖含量高的紫心甘薯汁和酸度很高的黑莓汁有效互补,再结合苹果汁的风味,其口味、色泽、营养具佳,稳定性良好.%[Objective]The present experiment was conducted to select the best formulation for developing mixed beverage from purple sweet potato, blackberry and apple, and to stabilize dosage to develop new healthy compound beverage with rich nutrient, alluring color and unique flavor. [Method]Three-factor orthogonal design and sensory evaluation were used to determine the best formulation of mixed beverage. The effect of different stabilizers on stability of mixed beverage was compared and the main nutrient components of mixed beverage were detected. [Result]The best formulation of compound beverage was a ratio of 5:3:2 of purple sweet potato juice, blackberry juice and apple juice with the addition of sucrose (30 g/L) and sodium carboxy methyl cellulose (CMC-Na) (1.2 g/L). [Conclusion]The prepared mixed beverage of purple sweet potato, blackberry and apple can make purple sweet potato juice and acid blackberry juice to complement each other,and it has beautiful color, unique flavor and high stability.

  8. High-quality and high-yield culture of purple sweet potato cultivar ‘ Yanzi 337’%‘烟紫337’紫薯优质高产栽培技术研究

    Institute of Scientific and Technical Information of China (English)

    刘亚柏; 刘伟忠; 陈宏州; 马媛媛; 赵亚夫; 王润芳; 王全洪

    2011-01-01

    通过对‘烟紫337’紫薯进行有机栽培试验,研究覆膜和施用农作物秸秆炭对其商品性和产量的影响.结果表明:农作物秸秆炭对紫薯有增产和减少虫害的作用,覆膜能有效防止虫害,但是施炭和覆膜也会导致藤蔓生长过旺,以致影响产量.%Organic cultural experiments with the purple sweet potato cultivar 'Yanzi 337' were carried out in order to investigate the effects of plastic mulching and straw charcoal on the marketability and yield of purple sweet potatoes. The results showed that application of straw charcoal could increase the yield and decrease the damage by insects,and plastic mulching could effectively prevent the damage by insects;but both application of straw charcoal and plastic mulching could also cause the vines to grow excessively, thus reducing the yield.

  9. Determination of Anthocyanins in Purple Sweet Potato by Microwave Digestion and Visible Spectrophotometric%微波消解-可见分光光度法测定紫甘薯中花青素

    Institute of Scientific and Technical Information of China (English)

    陈长应

    2016-01-01

    讨论紫甘薯中花青素的微波辅助提取及可见分光光度法定量检测方法。结果表明:在520 nm下测定样品中花青素的吸光度,相对标准偏差为5.26%(n=6),加标平均回收率为97.8%,最低检测浓度为0.835μg/mL。该方法简便准确,可用于紫甘薯中花青素含量的测定。%This article discuses the microwave-assisted extraction of anthocyanin from purple sweet potato and the way to quantitatively detect anthocyanin under visible spectrophotometer measure system. The result demonstrates that the determination of absrbance of anthocyanins in the sample at the 520 nm , the relative standard deviation is 5.26%(n=6), average recovery at the spiked level is 97.8%,the minimum detectable concentration of anthocyanin is 0.835 μg/mL. The present invention provides a quick easy way to quantitatively detect anthocyanin in purple sweet potatoes.

  10. Developed new product of purple sweet potatoes anthocyanins and study on its oxidation resistance%紫番薯花色苷新产品的研发及抗氧化性的研究

    Institute of Scientific and Technical Information of China (English)

    徐美玲

    2012-01-01

    This paper developed a purple sweet potatoes, anthocyanins yogurt discussed, and determined the anthocyanins of oxidation resistance. The results show that the purple sweet potatoes on anthocyanins superoxide anion and hydroxyl free radical ate good clear effect.The sour milk production conditions to sugar 8 g,inoculation amount of 10 mL,anthocyanins measures 1.5 mL,stabilizer 0.01 g .%开发了一种紫番薯花色苷酸奶产品,并对其花色苷的抗氧化性进行测定.结果表明,紫番薯花色苷对超氧阴离子和羟自由基均有较好的清除效果,酸奶的制作条件以白砂糖8 g,接种量10 mL,花色苷量1.5 mL,稳定剂0.01 g为宜.

  11. Study on the Processing Technology of Compound Beverage Mixed with Purple Sweet Potato and Soy Milk%紫甘薯豆浆复合饮料加工技术研究

    Institute of Scientific and Technical Information of China (English)

    刘波; 袁利鹏

    2012-01-01

    In this study, a new compound beverage was processed through a single factor and orthogonal experi- ment, using soybean and purple sweet potato as the main raw material. The primary and secondary factors were determined : the most important factor influenced on the beverage sensory quality was the proportion of purple sweet po- tato slurry and soybean milk, followed by the amount of CMC - Na, the amount of sugar, the amount of citric acid. The best recipe was that the ratio of purple sweet potato slurry and soybean milk was 80(g) : 20( g), the sugar con- tent was 7%, the citric acid content was 0.15%, the CMC - Na content was 0.2%. The products had good senso- ry, properties, not only contained a unique purple potato nutritional function, but also provided a theoretical basis for the development of new tofu product varieties.%实验以黄豆和紫薯为主要原料,通过单因素与正交试验制作新型复合饮料。实验确定了影响紫甘薯豆浆复合饮料感官品质的主次因素,即:紫甘薯浆与豆浆的比〉CMC—Na用量〉加糖量〉柠檬酸用量;紫甘薯豆浆复合饮料的最佳配方为:紫甘薯浆与豆浆的复合比例为80(g):20(g),加糖量为7%,柠檬酸为0.15%,CMC—Na为0.2%。制成的复合饮料是一种色泽自然、风味宜人、具有营养保健功能的食品,具有一定的市场发展潜力。

  12. Study on extraction, purification and stability of β- amylase from purple sweet potato%紫甘薯β-淀粉酶提取纯化及稳定性的研究

    Institute of Scientific and Technical Information of China (English)

    高路

    2012-01-01

    The stability of the β- amylase from purple sweet potato was researched. The results showed that the β- amylase had good thermal stability when the temperature was around 40 - 50℃. When pH 5.0 -7.0 the β-amylase was stable, which meant it had better acid stability than alkali stability.%对紫甘薯β-淀粉酶的稳定性进行了研究。结果表明紫甘薯β-淀粉酶在40~50℃有较好的热稳定性;在pH 5.0~7.0时有较好的稳定性,该酶对酸的耐受性相对较强而对碱的耐受性较弱。

  13. 不同干燥方法对紫薯品质特性的影响%Effects of Different Drying Methods on the Quality of Purple Sweet Potato

    Institute of Scientific and Technical Information of China (English)

    秦波; 路海霞; 陈绍军; 陈团伟; 吴春剑

    2014-01-01

    In order to improve the quality of dried purple sweet potato,hot air drying,microwave drying, vacuum drying and solar assisted heat pump drying were applied for investigating the effects on the physico-chemical properties and tissue structure of purple sweet potato during the drying process.Results showed that significant differences existed among these four different drying methods.Highest drying efficiency but inferior color and tissue structure for microwave drying.Ingredients were maintained well through highest power-con-sumption for vacuum drying.In a word,integrated excellent performances on drying efficiency,power-consump-tion,color and tissue structure were achieved by solar assisted heat pump drying.%为了提高紫薯干制品的品质,研究了热风干燥、微波干燥、真空干燥、太阳能辅助热泵联合干燥4种方法对紫薯干制加工过程中理化特性、组织结构的影响。结果表明:不同干燥方法所得产品在能耗、色泽、功效成分、硬度以及组织结构方面存在着显著性差异,微波干燥效率最高,但产品色泽和组织结构较差,真空干燥产品功效成分保持率最高,但干燥效率最低、能耗最大,而太阳能热泵干燥所得产品在干燥效率、能耗、色泽及组织结构等方面的综合表现最佳,所得产品质量好。

  14. Purple Pelisse: A specialty fingerling potato with purple skin and flesh and medium specific gravity

    Science.gov (United States)

    Purple Pelisse is a specialty fingerling potato with purple skin and dark purple flesh. It has medium maturity and sets a large number of smooth, small, fingerling-shaped tubers. The tubers have medium specific gravity and high levels of antioxidants. This potato variety is mainly intended for the f...

  15. Research on yogurt with purple potato%紫薯酸奶的研制

    Institute of Scientific and Technical Information of China (English)

    陈丹瑾; 程缘; 韩翠萍; 刘玲; 崔娜; 李刚; 王楠楠

    2012-01-01

    With fresh milk, fresh purple sweet potato as the main raw material, add streptococcus thermophilus and Bulgaria coli to make yogurt-Processing condition of the yogurt mixed purple sweet potato were studied. By single—factor test and orthogonal test to determine the optimal technological parameters of the production of purple sweet potato yogurt. Results show that the optimal fermentation parameters as: ratio of purple sweet potato and fresh milk is 1:4, inoculum is 4%, fermentation temperature is 37 ℃, fermentation time is 12 h, the amount of sugar added to 9%.Under the condition, the yogurt is lavender, uniform texture, aroma and rich, with a purple sweet potato lactic add bacteria fermented yoghurt aroma. The yogurt has a sweet and delicious taste with delicate, soft.%以鲜牛奶,新鲜紫薯为主要原料,添加嗜热链球菌和保加利亚乳杆菌,研究搅拌型紫薯酸奶的加工工艺条件.通过单因素试验和正交试验确定制作紫薯酸奶的最佳工艺参数.结果表明,紫薯与鲜牛奶的比例为1∶4,接种量为4%,发酵温度37℃,发酵时间为12 h,白砂糖添加量为9%.此条件下制作的酸奶呈淡紫色,质地均匀一致,具有紫薯和浓郁的乳酸菌发酵酸奶的香味,酸甜可口,口感细腻,柔和.

  16. 蛙骨骼肌检测紫色甘薯醇提物抗疲劳效应研究%Study on frog skeletal muscle test the anti-fatigue effect of alcohol extract of purple sweet potato

    Institute of Scientific and Technical Information of China (English)

    熊斌; 陶小丹; 王杨科

    2016-01-01

    To investigate extract effect of of purple sweet potato on frog muscle contraction and diastole and filtrate common factor in curve of frog muscle contraction and diastole foranti-fatigue, the most preliminary testing method of fatigue resistance was studied .Connecting the frog nerves-gastrocnemius muscle tension transducer , stimulating the nerve trunk , the curve of muscle contraction and diastole by physiological signal acquisition system.factor analysis is made by TFmax50, Tmax,△T, STI, DTI, DTI50, DTI90, +dT/dtmax,-dT/dtmax , t-dT/dtmax .According to the technical specification for inspection and evaluation of health food , mice experiments on anti-fatigue effect of alcohol extract of purple sweet potato is designed .Factor analysis ex-tract 5 constituent factors, and the cumulative variance is 90.22%, which is a better substitution for the origi-nal 10 indexes to evaluate the anti-fatigue effect of alcohol extract of purple sweet potato by frog skeletal mus-cle.Factor 1 ( DTI50, DTI90, TFmax50 ) can be initially identified as comprehensive factors , mainly for showing the duration of frog muscle diastole .DTI50, DTI90, TFmax50 in frog skeletal muscle reached signifi-cant difference between experimental group and the blank group (P<0.01), suggesting that alcohol extract of purple sweet potato by frog skeletal muscle is of great anti-fatigue effect and in agreement with the experimental conclusion in mice .DTI50 , DTI90 , TFmax50 can reflect of the anti-fatigue effect of alcohol extract of purple sweet potato on frog skeletal muscle .The results showed no difference from the test on mice .%研究紫色甘薯醇提物对蛙骨骼肌收缩舒张的影响,筛选出蛙骨骼肌收缩曲线共性因子作为骨骼肌研究抗疲劳指标,为蛙骨骼肌作为初步检测抗疲劳物方法提供依据。将蛙神经-腓肠肌标本连接到张力换能器,刺激神经干,用生理信号采集系统记录相应的曲线。统

  17. Storage performance of Taiwanese sweet potato cultivars.

    Science.gov (United States)

    Huang, Che-Lun; Liao, Wayne C; Chan, Chin-Feng; Lai, Yung-Chang

    2014-12-01

    Three sweet potato cultivars (TNG57, TNG66, and TNG73), provided by the Taiwanese Agricultural Research Institute (TARI), were stored at either 15 °C or under ambient conditions (23.8 ~ 28.4 °C and 77.1 ~ 81.0 % of relative humidity). Sweet potato roots were randomly chosen from each replicate and evaluated for measurement of weight loss, sugar content analysis, and sprouting after 0, 14, 24, 48, 56, 70, 84, and 98 days of storage. Fresh sweet potato roots were baked at 200 °C for 60 min then samples were taken for sugar analysis. After 14 days of ambient condition storage, the sprouting percentages for TNG57, TNG66, and TNG73 were 100, 85, and 95 % respectively. When sweet potatoes were stored at 15 °C, the weight loss became less and no sweet potato root sprouted after 14 days of storage. Because manufacturers can store sweet potatoes at 15 °C for almost 2 month without other treatments, the supply capacity shortage in July and September can be reduced. The total sugar content slowly increased along with increasing the storage time. After baking, the total sugar content of sweet potatoes significantly increased due to the formation of maltose. Maltose became the major sugar of baked sweet potatoes. Raw sweet potatoes stored at 15 °C had higher total sugar contents after baking than those stored under ambient conditions. Raw sweet potatoes were recommended to be stored at 15 °C before baking.

  18. Extraction, Purification and Antioxidantion of Polysaccharide from Purple Sweet Potato%紫红薯多糖的提取纯化及抗氧化作用研究

    Institute of Scientific and Technical Information of China (English)

    李翔; 上官新晨; 蒋艳; 吴少福; 陈继光

    2011-01-01

    The technology for extraction of polysaccharide from purple sweet potato was optimized by orthogonal array design. After removal of pigment and protein by X - 5 and sevag method respectively, Ⅰ and Ⅱ of polysaccharide portions were obtained by further purification by cellulose Chromatography DEAE. Addition ally , the antioxidant capacity of the purified polysaccharide was evaluated by determining their DPPH ? And ? OH and ABTS scavenging activities. The results indicated that the obtained optimum conditions are material to wa ter ratio 1:8, extraction time 60 min, extraction power 240 W. The yield of polysaccharide is 5.44% under the optimal conditions. After purification;Ⅰ and Ⅱ of polysaccharide portions showed considerable antioxidant capacity.%实验优化了从紫红薯中提取多糖的工艺,利用DEAE - 52柱层析分离纯化出紫红薯多糖Ⅰ和Ⅱ两个组分,并测定了对·OH、DPPH·和ABTS的清除作用.结果表明:紫红薯多糖最佳提取条件为提取时间60 min、料液比为1:8、超声功率为240W,经纯化后的紫红薯多糖I和Ⅱ具有较好的清除自由基的能力.

  19. Storage performance of Taiwanese sweet potato cultivars

    OpenAIRE

    Huang, Che-Lun; Liao, Wayne C.; Chan, Chin-Feng; Lai, Yung-Chang

    2013-01-01

    Three sweet potato cultivars (TNG57, TNG66, and TNG73), provided by the Taiwanese Agricultural Research Institute (TARI), were stored at either 15 °C or under ambient conditions (23.8 ~ 28.4 °C and 77.1 ~ 81.0 % of relative humidity). Sweet potato roots were randomly chosen from each replicate and evaluated for measurement of weight loss, sugar content analysis, and sprouting after 0, 14, 24, 48, 56, 70, 84, and 98 days of storage. Fresh sweet potato roots were baked at 200 °C for 60 min then...

  20. Sweet Potato Ketchup: Feasibility, Acceptability, and Production ...

    African Journals Online (AJOL)

    food businesses in East African urban areas. ... We assessed the feasibility, consumer acceptability, and cost of production for a ... The yellow flesh colour of the sweet potato had a good influence on the final consumer preference of the product.

  1. 紫甘薯花色苷对糖尿病大鼠肾脏的保护作用%Protective effects of anthocyanins from purple sweet potato on kidneys of diabetic fats

    Institute of Scientific and Technical Information of China (English)

    马淑青; 吕晓玲; 范辉

    2009-01-01

    Objective: To study the protective effects of anthocyanins from purple sweet potato(APSP)on kidneys of diabetic rats.Method: Diabetic models were induced by the i.v.injection of strepotozotocin(STZ).Rats were divided into six groups,the control group and model diabetic group were given distilled water(10mL/kg·bw),the metformin group were given metformin(200mg/kg·bw),the other three groups were given50,100,200mg/kg·bw APSP respectively for7weeks.Blood glucose,creatinine(Cr)and urea nitrogen(BUN)in serum,total antioxidant capacity(T-AOC)and malondialdehyde(MDA)in kidneys were tested.Paraffin sections were made using routine method,stained with periodic acid schiff(PAS)and observed under light microscope for histopathological changes.Results: Compared with the model group,blood glucose,serum Cr,serum BUN,and MDA in kindey were significantly lower and T-AOC in kidneys were higher in experimental groups which were given APSP.Besides,the conditions of renal glycogen were significantly imporved.Conclusion: APSP had protective effects on kidneys of diabetic rats.It did not only reduce blood glucose,but also increased the renal function and antioxidant capacity.%目的:探讨紫甘薯花色苷(Anthocyanins from Purple Sweet Potato,APSP)对糖尿病大鼠肾脏的保护作用.方法:用链脲佐菌素(STZ)尾静脉注射建立糖尿病模型.大鼠分为6组:正常对照组、糖尿病模型组、二甲双胍阳性组、APSP低剂量组、APSP中剂量组和APSP高剂量组.每天定时灌胃,正常对照组和糖尿病模型组灌胃蒸馏水(10mL/kg·bw),二甲双胍阳性组灌胃200mg/kg·bw剂量的二甲双胍,三个APSP剂量组分别灌胃50、100、200mg/kg·bw剂量的APSP,连续7周.测定大鼠血糖值、血肌酐(Cr)、血尿素氮(BUN)、肾脏总抗氧化能力(T-AOC)和丙二醛(MDA)水平,常规制作石蜡切片,PAS染色观察肾组织糖原状况.结果:灌胃7周,APSP能明显降低大鼠血糖值、血清Cr、BUN及肾

  2. Study on Chemical Constituents and Antioxidant Activity of Anthocyanins from Ipomoea batatas L.(purple sweet potato)%紫甘薯花色苷的组分及抗氧化活性研究

    Institute of Scientific and Technical Information of China (English)

    朱洪梅; 赵猛

    2009-01-01

    Anthocyanins extracted from purple sweet potatoes (Ipomoea batatas L.) were purified through AB-8 resin column. The extract contains 11 kinds of anthocyanins by HPLC-DAD analysis. The majority of the anthocyanins are acylated cyanidin and peonidin. The objective of this study was to investigate the antioxidant activities of anthocyanins from purple sweet potatoes by different analytical methods: the α,α-diphenyl-β-picrylhydrazyl (DPPH) radical-scavenging effect and superoxide anions radical-scavenging effect, reducing power and antioxidant effect on lipid peroxidation in a linoleic acid model system. At a concentration of 0.5g/L, the reducing power of anthocyanins, L-ascorbic acid (L-AA) and butylated hydroxytoluene (BHT) reached 0.572, 0.460 and 0.121, respectively. The result displayed that anthocyanins possessed excellent reducing power. The fact that half inhibition concentrations (IC50) of anthocyanins scavenging DPPH radical and superoxide anions radical were 6.94 and 3.68mg/Lrespectively indicates that anthocyanins were effective in scavenging DPPH and superoxide anions radical. In addition, anthocyanins could significantly inhibit the peroxidation of lipid.%对紫甘薯花色苷的化学成分和抗氧化活性进行了研究.研究采用大孔树脂AB-8纯化紫甘薯花色苷,高效液相色谱-2极管阵列法(HPLC-DAD)分析表明,纯化后的提取物中共含有11种花色苷,其中主要成分为酰化的矢车菊素和芍药素.并测定了紫甘薯总花色苷在DPPH自由基清除体系、超氧阴离子体系、还原力和亚油酸体系的抗氧化活性.在质量浓度均为0.5g/L时,花色苷、L-AA和 BHT的还原力分别为0.572、0.460 和0.121,花色苷的清除DPPH自由基的半数抑制浓度(IC50)和清除超氧阴离子IC50分别为6.94和3.68mg/L,表明花色苷还原能力强,并能有效地清除DPPH自由基和超氧阴离子.此外,紫甘薯花色苷能较好地抑制脂质过氧化.

  3. Probiotic-fermented purple sweet potato yogurt activates compensatory IGF‑IR/PI3K/Akt survival pathways and attenuates cardiac apoptosis in the hearts of spontaneously hypertensive rats.

    Science.gov (United States)

    Lin, Pei-Pei; Hsieh, You-Miin; Kuo, Wei-Wen; Lin, Yueh-Min; Yeh, Yu-Lan; Lin, Chien-Chung; Tsai, Fuu-Jen; Tsai, Chang-Hai; Huang, Chih-Yang; Tsai, Cheng-Chih

    2013-12-01

    Apoptosis is recognized as a predictor of adverse outcomes in subjects with cardiac diseases. The aim of this study was to explore the effects of probiotic-fermented purple sweet potato yogurt (PSPY) with high γ-aminobutyric acid (GABA) content on cardiac apoptosis in spontaneously hypertensive rat (SHR) hearts. The rats were orally adminsitered with 2 different concentrations of PSPY (10 and 100%) or captopril, 15.6 mg/kg, body weight (BW)/day. The control group was administered distilled water. DAPI and TUNEL staining were used to detect the numbers of apoptotic cells. A decrease in the number of TUNEL-positive cardiac myocytes was observed in the SHR-PSPY (10 and 100%) groups. In addition, the levels of key components of the Fas receptor- and mitochondrial-dependent apoptotic pathways were determined by western blot analysis. The results revealed that the levels of the key components of the Fas receptor- and mitochondrial-dependent apoptotic pathway were significantly decreased in the SHR-captopril, and 10 and 100% PSPY groups. Additionally, the levels of phosphorylated insulin-like growth factor‑I receptor (p-IGF‑IR) were increased in SHR hearts from the SHR-control group; however, no recovery in the levels of downstream signaling components was observed. In addition, the levels of components of the compensatory IGF-IR-dependent survival pathway (p-PI3K and p-Akt) were all highly enhanced in the left ventricles in the hearts form the SHR-10 and 100% PSPY groups. Therefore, the oral administration of PSPY may attenuate cardiomyocyte apoptosis in SHR hearts by activating IGF‑IR-dependent survival signaling pathways.

  4. Effect of Heat Moisture Treatment on Functional Properties and Microstuctural Profiles of Sweet Potato Flour

    Directory of Open Access Journals (Sweden)

    Widya Dwi Rukmi Putri

    2014-05-01

    Full Text Available Heat moisture treatment is the physical method of modification to give sweet potato flour desired physical properties for application in the manufacture of flour based products. Two varieties of sweet potato flour were characterized to understand the changes of physicochemical properties and micro-structural profile upon heat moisture treatment. Sweet potato flours were analyzed its pasting properties, crystallinity characteristics and starch granule structure by using Rapid Visco Analyzer, X-ray Diffraction and Scanning Electron Microscopy, respectively. The results indicated that the heat moisture treatment affected characteristics of all sweet potato flour were treated at, moderate and high temperature. There were a decreasing in peak viscosity and an increase in cold paste viscosity following heat-moisture treatment compare to native sweet potato. The changes differ between yellow sweet potato and purple sweet potato. This indicates that different starches may respond differently to physical modification. The diffractograph of flour samples showed the main peak mainly in 15°, 16°, 17°, 22° and 23°, that correspond to the spacing-d in 5, 8, 5, 3, 4, 9 and 3, 8 Å, respectively. This reflection indicates the presence of a A-type crystalline.

  5. Agronomic performance of locally adapted sweet potato (Ipomoea ...

    African Journals Online (AJOL)

    SERVER

    limited fertility and inadequate moisture (Bioethics, 2004). Despite sweet potato having a high ... the susceptibility of sweet potato to virus diseases which has caused substantial yield reduction of up to 80%. (Karyeija et al., 2000; Odame et al., ...

  6. Sweet Potato Ketchup: Feasibility, Acceptability, and Production ...

    African Journals Online (AJOL)

    product, in which up to 80% tomatoes were substituted with sweet potato, was found to be organoleptically ... formulation had little influence on the final pH, which ranged from 3.8 to 4.1. Titratable acidity ... system to add value to their produce;.

  7. Effect of heat treatment to sweet potato flour on dough properties and characteristics of sweet potato-wheat bread.

    Science.gov (United States)

    Pérez, Isela Carballo; Mu, Tai-Hua; Zhang, Miao; Ji, Lei-Lei

    2017-01-01

    The effect of heat treatment at 90, 100, 110 and 120 ℃ for 20 min to sweet potato flour on dough properties and characteristics of sweet potato-wheat bread was investigated. The lightness (L*) and a* of sweet potato flour samples after heat treatment were increased, while the b* were decreased significantly, as well as the particle size, volume and area mean diameter ( p dough with sweet potato flour increased significantly from 1199 ml without heat treatment to 1214 ml at 90 ℃ ( p < 0.05). In addition, specific loaf volume of sweet potato-wheat bread with sweet potato flour after heat treatment increased significantly, which was the largest at 90 ℃ (2.53 cm(3)/g) ( p < 0.05). Thus, heat treatment at 90 ℃ to sweet potato flour could be potentially used in wheat bread production.

  8. Effect of processing techniques on color and active components amount of sweet potato (Ipomoea Batatas l) flakes

    Science.gov (United States)

    Rahmawati, Y.; Mahmudatussa'adah, A.; Yogha, S.

    2016-04-01

    Sweet potato processing is limited, such as flour, snacks, cystic, or chips. Flakes as pre-cooked meals are made through the stages of making pasta and drying. The purpose of this study was to optimize the production of sweet potato flakes at the stage of making pasta and drying. Making the pasta is done through techniques steamed or baked. Pasta drying using tools a drum dryer or cabinet dryer. As an indicator of optimization is the total of monomeric anthocyanins, β-carotene and color the resulting flakes. The results showed that the amount of anthocyanin monomeric flakes by using steam, and drum dryer (3.83 ± 0.03 mg CYE/g db), flakes by the technique of steam, and cabinet dryer (3.03 ± 0.02 mg CYE/g db), flakes with techniques bake, drum dryer (2.49 ± 0.05 CYE mg/g db), flakes with bake technique, cabinet dryer (1.98 ± 0.03 mg CYE/g db). The Color of purple sweet potato flakes produced through steamed techniques bright purple, while the color purple sweet potato flakes produced through techniques roast give a brownish purple color. The amount of β-carotene yellow flakes sweet potato with stages of cooking steamed, drum dryer (152±0.5 mg/Kg db), grilled drum dryer (136±0.4 mg/Kg db), flakes of yellow sweet potato with stages of roasted and cabinet dryer (140±0.8 mg/Kg db), and grilled stage with cabinet dryer (122±0.3 mg/Kg db). In conclusion sweet potato flakes production techniques through the stages of steam process, and used drum dryers have a number of anthocyanins or β-carotene bigger and brighter colors than the baked flakes techniques and used cabinet dryer.

  9. Analysis of Eco-origin Protection of Agricultural Products---Taking GuanYang Purple Sweet Potato Products as Examples%农产品生态原产地保护分析研究--以灌阳紫甘薯制品为例

    Institute of Scientific and Technical Information of China (English)

    苏悦娟; 孔祥军; 刘馨磊

    2014-01-01

    分析了灌阳紫甘薯制品生态原产地保护的关键要素,为加快我国农产品生态原产地保护提供了分析框架。本文采用层次分析法对灌阳紫甘薯制品的生态要素、原产地要素、综合要素进行评价,认为我国生态原产地保护,是当前全球资源约束趋紧、环境污染严重、生态系统退化的严峻形势下,依靠科技创新驱动,走绿色发展、可持续发展道路,推动经济转型升级的战略选择。文章认为要通过生态原产地保护给农产品追加竞争优势,地方政府也应出台配套环境保护制度、产业政策、科技政策、财税政策,加快制定《紫甘薯制品生态原产地保护评定细则》,并且加快与欧美日韩等国家和地区开展农产品生态标签制度互认。%This article analyses the essence of Eco-origin Protection of Guan Yang Purple Sweet Potato Products and supplies an analytical framework of Eco-origin Protection of Agricultural Products. The article uses Analytic hierarchy process to appraise ecological factors , Eco-origin factors and comprehensive factors of Guan Yang Purple Sweet Potato Products. To this article , Eco-origin Protection in China is a strategic choice to take the road of green development and sustainable development based on technological innovation in the grim situation of serious pollution and degenerative ecosystems. In order to gain the additional competitive advantage of agricultural production by Eco-origin Protection , local governments should publish coordinated regulations of environmental protection, industrial policy, technical policy and finance and taxation policy and speed up the formulation of the Rubrics of Eco-origin Protection of Guan Yang Purple Sweet Potato Products and the mutual recognition on ecological label of agricultural products with nations and regions including Europe, US, Japan and Korea.

  10. A review of therapeutic potentials of sweet potato: Pharmacological ...

    African Journals Online (AJOL)

    of a plant may inherently differ in their nutritional .... the skin of sweet potato root tubers are also rich source of ..... Diabetes Care. 2004; 27: 436- .... Evid Based Complement. Alternat Med ... potato in the presence of food preservatives. Food Sci.

  11. Effects of co-pigments on enhancing stability of red pigment from purple sweet potato%辅色剂提高紫甘薯红色素的稳定性研究

    Institute of Scientific and Technical Information of China (English)

    孙晓侠; 马龙; 王改玲; 吴珊珊; 许晖

    2013-01-01

    利用辅色作用提高紫甘薯红色素的稳定性通过预选实验筛选3种辅色效果较好的辅色剂,然后采用正交实验对辅色剂组合和用量进行了优化,并研究了加入辅色剂后色素对热、光照和食品添加剂的稳定性.结果表明,辅色效果较好的3种辅色剂依次为盐酸-L-半胱氨酸、单宁酸和柠檬酸,正交实验优化的色素辅色剂最佳配方为盐酸-L-半胱氨酸0.6g/L、单宁酸0.2g/L、柠檬酸3g/L.加入最佳配方辅色剂后,显著地提高了色素对热和光照的耐受性,增强了Fe3+和Al3+的对色素的增色效果,减弱了Fe2+和Cu2+对色素的不良影响,对防腐剂苯甲酸钠、氧化剂H2O2、还原剂Na2SO3 的耐受性均稍有增加.使用辅色剂对紫甘薯红色素的稳定性有了较大地改进和提高,大大提高了其应用价值.%Co-pigment method was used for enhancing the stability of red pigment from purple sweet potato (PSPP). Preliminary experiment was carried on selecting three co-pigments with better effects, and orthogonal test design was adopted to determine the best combination and adding contents, also the stability of the pigment on heat,light and food additives after adding co-pigments was studied. The results indicated that: three co-pigments with better effects were orderly listed as L-cysteine hydrochloride,tannin,citric acid. The optimum co-pigments parameters were as follows:L-cysteine hydrochloride 0.6g/L,tannin 0.2g/L,citric acid 3g/L. Using the optimum co-pigments parameters, the resistance of the pigment to heat and light was obviously improved. Co-pigment effects of Fe3+ and Al3+ were enhanced,and bad effects of Fe2+ and Cu2+ were reduced. The resistance to benzoate sodium, H2O2, Na2SC3 were all increased slightly. The stability of PSPP was largely improved and enhanced after adding co-pigments, and its application value was greatly improved.

  12. 响应面法优化紫薯片的微波干制工艺%Optimize of microwave drying technology of purple sweet potato slices by response surface methodology

    Institute of Scientific and Technical Information of China (English)

    黄艳斌; 李星琪; 陈厚荣

    2015-01-01

    The fresh purple sweet potato was used as raw material and the characteristics of microwave drying and Optimizing of the drying were studied.The thickness and weight of slice, as well as the power of microwave on the influence of moisture content and drying rate and energy consumption were investigated by single factor experiment to get reasonable scope of various factors.On the basis of single factor experiment, water loss rate, energy consumption and the color value were chosen as the evaluation indexes.Optimal technological conditions were studied by the regression model established by three factors and three levels of response surface analysis.The results show that the weight and the dry power were the main factors affecting the rate of water loss and power consumption and the color difference value.Taking the greatest value of water loss, and smallest value of energy consumption and the color difference as factors, using the Design-Expert analysis software, the optimized conditions were: 2 mm thickness chips, weight 55.36g, microwave power 650 W, the water loss rate 17.215 8%/min, the power consumption 2.548 5 (kW · h)/ min, and the color difference 32.837 6.Under the same conditions, the validated experiments showed: water loss 17.103 8%/min,the power consumption 2.832 9 (kW · h)/min, the color difference 32.837 6.The experimental value is very close to the predicted value.%以新鲜紫薯为原料,研究其微波干燥特性并优化其干燥工艺参数.在单因素试验中,研究了切片厚度、载重量、微波功率对含水率、能耗及干燥速率的影响,得出各因素的合理范围.在单因素试验基础上,以失水速率、能耗、色差值为评价指标,利用三因素三水平的响应面分析法,优化了微波干燥工艺条件并建立了回归模型.结果表明:载重量、干燥功率是影响失水速率、耗电率、色差值的主要因素.通过对失水速率取极大值、能耗及色差取极小值,用Design

  13. Studies for Somatic Embryogenesis in Sweet Potato

    Science.gov (United States)

    Bennett, J. Rasheed; Prakash, C. S.

    1997-01-01

    The purpose of this study was to improve the somatic embryo (SE) system for plant production of sweet potato (Ipomoea batatas L(Lam)). Explants isolated from SE-derived sweet potato plants were compared with control (non SE-derived) plants for their competency for SE production. Leaf explants were cultured on Murashige-Skoog (MS) medium with 2,4-dichlorophenoxy acetic acid (0.2 mg/L) and 6-benzylaminopurine (2.5 mg/L) for 2 weeks in darkness and transferred to MS medium with abscisic acid (2.5 mg/L). Explants isolated from those plants developed through somatic embryogenesis produced new somatic embryos rapidly and in higher frequency than those isolated from control plants They also appeared to grow faster in tissue culture than the control plants. Current studies in the laboratory are examining whether plants derived from a cyclical embryogenesis system (five cycles) would have any further positive impact on the rapidity and frequency of somatic embryo development. More detailed studies using electron microscopy are expected to show the point of origin of the embryos and to allow determination of their quality throughout the cyclical process. This study may facilitate improved plant micropropagation, gene transfer and germplasm conservation in sweet potato.

  14. WATER EXTRACT OF SWEET POTATO LEAF IMPROVED LIPID PROFILE AND BLOOD SOD CONTENT OF RATS WITH HIGH CHOLESTEROL DIET

    Directory of Open Access Journals (Sweden)

    I Wayan Sumardika

    2013-04-01

    Full Text Available Food stuffs with high flavonoids content  are believed to prevent various diseases caused by oxidative stress because of its antioxidants effect.  Purple sweet potato leaves have been proved containing high flavonoids, and can be developed very easily. To prove antioxidant and hypolipidemic properties of the water extract of purple sweet potato leaves, one research was conducted in the Department of Pharmacology, Faculty of Medicine, Udayana University. The study design was randomized control group pre- and post-test.  Twenty adult male wistar rats were divided into two groups of 10 rats. Both groups of rats were given high-cholesterol diet for three months to induce dyslipidemia. Control group of 10 rats were given only high-cholesterol diet alone, whereas the treatment group also treated with purple sweet potato leaf water extract with a dose of 6 cc per day divided into two doses. Before treatment and after treatment, lipid profile and blood SOD levels were measured. The results showed a decrease in total cholesterol, triglycerides and LDL cholesterol significantly in the treated group (P = 0.0001. In the treatment group there was also an increase in HDL cholesterol and blood SOD which was significantly differ than the control group (P = 0.0001. From the results of this study, it can be concluded that administration of water extract of purple sweet potato leaves can improve the lipid profile and increase blood SOD of rat given high-cholesterol diet.

  15. Characteristics of New Variety of Purple Sweet Potato Zhezishu No.1 on Early Mature Cultivation%甘薯浙紫薯1号早收栽培的特征特性

    Institute of Scientific and Technical Information of China (English)

    刘伟明; 吴列宏; 沈升法; 朱新颖

    2013-01-01

    Test for observing the characteristics of early mature cultivation of Zhezishu No.1 was conducted to ensure the feasibility of Zhezishu No.1 being cultured as mini-sweet potato and provide basis for its efficient cultivation.The results showed that Zhezishu No.1 produces tuber early and enlarges fast at prophase,has 6 tuber number per plant and few crude fiber in small tuber and good fresh taste,is suitable for been cultivated as a early mature mini-sweet potato.%为了明确甘薯(Ipomoea batatas L.)浙紫薯1号作为迷你甘薯种植的可行性,并为高效栽培提供依据,开展了浙紫薯1号早收栽培的特征特性观察试验.结果表明,浙紫薯1号结薯早,单株结薯数6个左右,前期薯块膨大快,小薯的粗纤维也较少,食味好,适宜作为迷你甘薯种植.

  16. Genetic diversity and population structure of begomoviruses infecting sweet potato

    Science.gov (United States)

    Begomoviruses infecting sweet potatoes (Ipomoea batatas) exhibit high genetic diversity, and approximately eight species including Sweet potato leaf curl virus (SPLCV) have been described from different regions around the world. In this study, the complete genomic sequences of 17 geographically dist...

  17. An Insight into Sweet Potato Weevils Management: A Review

    Directory of Open Access Journals (Sweden)

    Seow-Mun Hue

    2015-01-01

    Full Text Available Sweet potato is an important food crop that is grown widely in tropical and subtropical regions. Sweet potato weevil is the most disastrous pest affecting sweet potato plantations, causing millions of dollars losses annually. An effective integrated pest management (IPM method will help to prevent economic losses, and it is crucial to understand the factors that contribute to weevil infestation and strategies that are available to overcome them. This review summarizes the (1 mechanisms of action of weevil on sweet potato and (2 contributing factors in weevil infestation, followed by (3 discussion on current IPM practices used in the different regions, including intercropping, entomopathogenic fungi and bacteria, sex pheromones, and pesticides. Lastly, it also focuses on (4 applications of advanced biotechnology and genomics strategies towards reducing weevil’s infestation in sweet potato plantation.

  18. Effects of Several Purple Potato Additions on Bread Quality

    Directory of Open Access Journals (Sweden)

    Bădărău Carmen Liliana

    2016-04-01

    Full Text Available Potato cultivars with purple flesh represent an efficient and natural source of antioxidants, this vegetable having high content in polyphenols (especially anthocyanin pigments. The research goal of this work was to evaluate the anthocyanin and polyphenols content of several Romanian potato varieties (Albastru-Violet de Gălănești and Christian and the effects of these potatoes (add to dough in different proportions on several bread quality indicators. The bread quality depends on physical and chemical properties and on several signs like: flavor and taste, external appearance, crumb porosity and texture, bread’s volume. In this research experiment, beside the total polyphenols and anthocyanin content, the analysis performed on bread (prepared using different potatoes addition 5%, 15% and 30% were sensorial and physic chemical analysis (product volume, crumb porosity, height/diameter ratio, moist and acidity. Experimental results indicated that 15% purple potato cultivar added on the dough was the most indicate proportion to be used in bread processing.

  19. 7 CFR 318.13-24 - Sweet potatoes from Puerto Rico.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 5 2010-01-01 2010-01-01 false Sweet potatoes from Puerto Rico. 318.13-24 Section 318... Articles From Hawaii and the Territories § 318.13-24 Sweet potatoes from Puerto Rico. Sweet potatoes from... met: (a) The sweet potatoes must be certified by an inspector of Puerto Rico as having been grown...

  20. Rheological properties of sweet potato starch before and after denaturalization

    Institute of Scientific and Technical Information of China (English)

    肖华西; 林亲录; 夏新剑; 李丽辉; 林利忠; 吴卫国

    2008-01-01

    Based on the sweet potato starch,cationic starch,acetic starch and cationic-acetic compoundedly modified starch were made through chemical denaturalization.The above three kinds of static rheological parameter and dynamic rheological parameter were measured,respectively.The experimental result reveals that the thermal stability of starchy viscosity increases after chemical denaturalization.Under the condition of identical shearing rate,the shear stress of cationic-acetic ester compoundedly modified sweet potato starch paste is the largest among these kinds of sweet potato starch.This attributes to a phenomenon of shearing thinning.Furthermore,raw sweet potato starch has a larger gel intensity than that of modified starch.

  1. Resource Use Efficiency in Sweet Potato Production in Kwara State ...

    African Journals Online (AJOL)

    Open Access DOWNLOAD FULL TEXT Subscription or Fee ... Primary data were collected from one hundred sweet potato farmers who were selected from the two local government areas during the 2003/2004 farming season. The data was ...

  2. Genetic diversity of sweet potatoes collection from Northeastern Brazil

    African Journals Online (AJOL)

    Ana Veruska Cruz da Silva Muniz

    2014-02-24

    Feb 24, 2014 ... The sweet potato, Ipomoea batatas (L.) Lam has its origin in Tropical America. ... breeders to compare the phenotypic effects of genes or ... developmental and environmental variations. ..... Crop Evolution 45:271-277.

  3. IN VITRO PRODUCTION OF VIRUS-FREE SWEET POTATO ...

    African Journals Online (AJOL)

    Preferred Customer

    There was 100% sweet potato virus elimination from all the three varieties by meristem culture as observed by using ... cultivar, stage of infection and environmental ... genotypes. ..... variety interaction on shoot multiplication. ..... MSc thesis,.

  4. Weather Shocks, Sweet Potatoes and Peasant Revolts in Historical China

    OpenAIRE

    Ruixue Jia

    2011-01-01

    Does production technology adoption affect conflict? This paper studies this question with yearly historical data on weather, peasant revolts and the diffusion of sweet potatoes in China between 1470 and 1900. It shows that droughts increased peasant revolts by about 10% whereas the effect of floods was not significant. Moreover, the diffusion of a new crop, sweet potatoes, mitigated the effects of droughts on revolts.

  5. Thermal Diffusivity of Sweet Potato Flour Measured Using Dickerson Method

    Directory of Open Access Journals (Sweden)

    I.K. Tastra

    2006-08-01

    Full Text Available Sweet potato (Ipmoea batatas I. is one the carbohydrate sources in indonesia that can be used both for food and industry purposes. To support the utilization of sweet potato as flour, it is imperative to develop a drying system that can improve its quality. A preliminary study using an improved variety, namely Sari, was conducted to determine its floure thermal diffusivity ( , an imprortant parameter in developing drying process. The experiment was run according to Dickerson method using sweet potato flour at different levels of moisture content (5.05-5.97% wet basis and temperatures (23.7 -40.9 oC this method used an apparatus based on transient heat transfer condition requiring only a time- temperature data. At the levels of moisture and temperature studied, the thermal diffusivity of sweet potato flour could be expressed using a linear regression model, = 10-9 M.T + 9X 10-9( R2=0.9779. the average value of the thermal diffusivity sweet potato flour was 1.72 x 10-7 m2/s at a moisture level of 5.51 % wet basis and temperature of 29.58 oC. Similar studies are needed for different varieties or cultivars of sweet potato as well at a wide range of moisture content and temperature content and temperature levels.

  6. Effect of Different Drying Methods on Drying Efficiency and Quality of Purple Sweet Potato%不同干燥方法对紫薯干燥效率及品质的影响

    Institute of Scientific and Technical Information of China (English)

    李文峰; 肖旭霖

    2014-01-01

    Objective]In order to improve the drying efficiency and drying quality of purple sweet potato (PSP), the effect of different drying methods on moisture lost, value of color difference, anthocyanins, polyphenol and antioxidant of PSP were studied.[Method]The PSP were dried by hot air cross-flow drying, forced air drying, air-impingement jet drying and hypoxia air-impingement jet drying. Firstly, the effect of the three kinds of drying methods including hot air cross-flow drying, forced air drying and air-impingement jet drying on drying curves, drying rate curves and effective moisture diffusion coefficient under the conditions of drying temperature of 70℃,slice thickness of 1.93 mm and microwave pre-treatment for 3 min was studied. Secondly, the effect of four kinds of drying methods including hot air cross-flow drying, forced air drying, air-impingement jet drying and hypoxia air-impingement jet drying on color, total anthocyanins content, total polyphenol content and DPPH· scavenging activity of PSP was analyzed under the conditions of drying temperature of 70℃of ,1s.9li3cemthmicakndessmicrowave pre-treatment for 3 min. Furthermore, the influence of four factors including air temperature, air velocity, nozzle distance and slice thickness of hypoxia air-impingement jet drying on the color, total anthocyanins content, total polyphenol content and DPPH· scavenging activity of PSP were studied. [Result]According to the experimental data, there was a similarity law in water loss of PSP, compared with the most results of food material drying test. Forced air drying, hot air cross-flow drying and air-impingement jet drying of PSP mainly occurred in the falling rate drying period. There was no stage of constant rate drying in the drying process. The drying rate of air-impingement jet drying was 84.04%higher than the forced air drying, and it was also 61.60%higher than hot air cross-flow drying. The moisture content of PSP decreased very fast during the first 40 min

  7. Sweepoviruses cause disease in sweet potato and related Ipomoea spp.: fulfilling Koch's postulates for a divergent group in the genus begomovirus.

    Directory of Open Access Journals (Sweden)

    Helena P Trenado

    Full Text Available Sweet potato (Ipomoea batatas and related Ipomoea species are frequently infected by monopartite begomoviruses (genus Begomovirus, family Geminiviridae, known as sweepoviruses. Unlike other geminiviruses, the genomes of sweepoviruses have been recalcitrant to rendering infectious clones to date. Thus, Koch's postulates have not been fullfilled for any of the viruses in this group. Three novel species of sweepoviruses have recently been described in Spain: Sweet potato leaf curl Lanzarote virus (SPLCLaV, Sweet potato leaf curl Spain virus (SPLCSV and Sweet potato leaf curl Canary virus (SPLCCaV. Here we describe the generation of the first infectious clone of an isolate (ES:MAL:BG30:06 of SPLCLaV. The clone consisted of a complete tandem dimeric viral genome in a binary vector. Successful infection by agroinoculation of several species of Ipomoea (including sweet potato and Nicotiana benthamiana was confirmed by PCR, dot blot and Southern blot hybridization. Symptoms observed in infected plants consisted of leaf curl, yellowing, growth reduction and vein yellowing. Two varieties of sweet potato, 'Beauregard' and 'Promesa', were infected by agroinoculation, and symptoms of leaf curl and interveinal loss of purple colouration were observed, respectively. The virus present in agroinfected plants was readily transmitted by the whitefly Bemisia tabaci to I. setosa plants. The progeny virus population present in agroinfected I. setosa and sweet potato plants was isolated and identity to the original isolate was confirmed by sequencing. Therefore, Koch's postulates were fulfilled for the first time for a sweepovirus.

  8. SWOT Analysis and Countermeasures on Development of Sweet Potato Industry in Ziyun County

    Institute of Scientific and Technical Information of China (English)

    Shuang; YU1; Xiaoshan; YANG; Guang; LI

    2013-01-01

    According to the actual situation of sweet potato industry development in Ziyun County, we use SWOT analysis method to conduct strategic analysis on strengths and weaknesses of the internal environment and the opportunities and challenges of the external environment of the sweet potato industry, to explore correct strategic countermeasures suitable for the future development of sweet potato industry in Ziyun County and provide reference for the sweet potato industry to maintain sustainable competitiveness.

  9. The use of potato and sweet potato starches affects white salted noodle quality

    NARCIS (Netherlands)

    Chen, Z.; Schols, H.A.; Voragen, A.G.J.

    2003-01-01

    Potato and sweet potato starches and derivatives thereof were used to substitute part of the wheat flour in white salted noodle (WSN) manufacture. The quality of the WSN obtained was compared with the quality of WSN made from wheat flour only. When up to 20% of wheat flour was replaced by acetylated

  10. Substituent distribution within cross-linked and hydroxypropylated sweet potato starch and potato starch

    NARCIS (Netherlands)

    Zhao, J.; Schols, H.A.; Chen Zenghong,; Jin Zhengyu,; Buwalda, P.L.; Gruppen, H.

    2012-01-01

    Revealing the substituents distribution within starch can help to understand the changes of starch properties after modification. The distribution of substituents over cross-linked and hydroxypropylated sweet potato starch was investigated and compared with modified potato starch. The starches were

  11. BIHON TYPE NOODLES FROM HEAT MOISTURE TREATED STARCH OF FOUR VARIETIES OF SWEET POTATO [Mi Tipe Bihun dari Pati Heat Moisture Treatment dari Empat Varietas Ubi Jalar

    Directory of Open Access Journals (Sweden)

    Vera Apryana Lase

    2013-06-01

    Full Text Available Sweet potato starch has limited uses in food industry, but modification of its properties may make it more suitable for use especially for starch based food such as bihon type noodle. The objective of this research was to study the effect of heat moisture treated starch from 4 varieties of sweet potato on the quality of its bihon type noodle. Four different varieties of sweet potato i.e. white, yellow, orange and purple tuber were treated with heat moisture treatment (HMT. The HMT was performed by exposing the starch to high temperature (110°C for 3 hours at a moisture content of 25%. The HMT modified sweet potato starch was then processed into bihon type noodle. As a control, a commercial bihon type noodle made from rice starch was used. Parameters evaluated were the modified starch and bihon properties. The results showed that the modification of starch with HMT could increase the peak viscosity, setback viscosity, final viscosity and gelatinization temperature but lower the value of the breakdown viscosity. The best bihon from the four varieties of sweet potatoes was that made from white sweet potato starch because it has low cooking losses, low fat, but has high color/brightness and is preferred by panelist.

  12. Resource use Efficiency in Sweet Potato Production in Odeda Local ...

    African Journals Online (AJOL)

    supplementary pig forage (Yen, 1991). The leaves are ... anyone or a combination of the farmer's objectives can ... the farmers' ability to achieve the optimal mix, having the right and ... grown in the area are yam, sweet potato, maize, cassava ...

  13. Transmission of Sweet Potato Leaf Curl Virus by Bemisia tabaci

    Science.gov (United States)

    Sweetpotato, Ipomoea batatas (L.) Lam. (Solanales: Convolvulaceae), is an important world food crop, and Asia is the focal production region. Because it is vegetatively propagated, sweetpotato is especially prone to accumulate infections by several viruses. Sweet potato leaf curl virus (SPLCV) (ss...

  14. Assessment of genetic diversity of sweet potato in Puerto Rico

    Science.gov (United States)

    Sweet potato (Ipomoea batatas L.) is the seventh most important food crop due to its distinct advantages, such as adaptability to different environmental conditions and high nutritional value. Assessing the genetic diversity of this important crop is necessary due to the constant increase of demand ...

  15. Improvement of sweet potato yield using mixtures of ground fish bone and plant residues

    OpenAIRE

    A C Novianantya; N K Fardany; N. Nuraini

    2017-01-01

    The Indonesian government begins to promote food diversification program. The government expects the Indonesian people can consume food crops other than rice, such as wheat, potatoes and sweet potatoes. While, the level of production of sweet potato production decreased in the period of 2012-2015 with total production of only 2,218,992 t/ha. In an effort to increase the production of sweet potato, improvements are needed through application of organic fertilizers like composts. The purpose of...

  16. Peter Wilcox: A new purple-skin, yellow flesh fresh market potato cultivar

    Science.gov (United States)

    Peter Wilcox is a new, medium-maturing, purple-skin, yellow-flesh potato cultivar for fresh market. Peter Wilcox also produces light-colored chips, although it is being released primarily as a fresh market potato because of its skin and flesh colors. Tubers of Peter Wilcox are attractive, smooth, wi...

  17. Control strategies for sweet potato virus disease in Africa.

    Science.gov (United States)

    Gibson, Richard W; Aritua, Valentine; Byamukama, Emmanuel; Mpembe, Isaac; Kayongo, James

    2004-03-01

    Sweet potato virus disease (SPVD), caused by dual infection with the whitefly-borne Sweet potato chlorotic stunt virus (SPCSV) and the aphid-borne Sweet potato feathery mottle virus (SPFMV), is the most serious disease of sweet potato in Africa. SPVD has been known there since at least the 1940s, although it took several decades to elucidate its aetiology. It occurs throughout Africa and is particularly prevalent in the Great Lakes region. Production of sweet potato is largely by resource-poor farmers, growing mostly local landraces and for home consumption and so control strategies need to be appropriate to these circumstances. Most high yielding and/or early maturing landraces in Uganda are susceptible to SPVD and most resistant landraces are low-yielding, forcing farmers to compromise between the conflicting requirements of large and/or early yields, and food security. Accordingly, two strategies were tested to avoid the disadvantages associated with such compromises. These were deploying high-yielding SPVD-resistant cultivars and phytosanitation practices to enable susceptible landraces to be grown successfully. In on-farm trials in Masaka and Rakai Districts of Uganda, some SPVD-resistant cultivars bred at Namulonge Agricultural and Animal Research Station (NAARI), in Wakiso District, out-yielded local landraces. Other trials at NAARI and at nearby farms showed that roguing diseased cuttings within 1 month of planting and isolation from diseased crops, even by as little as 15m, can considerably decrease spread of SPVD to susceptible cultivars. This indicates that phytosanitation can protect desirable susceptible cultivars, even if adopted only locally. A dual approach of deploying both resistant varieties and phytosanitation provides farmers with a valuable increase in their choice of control strategies for SPVD.

  18. The Application of Embedding Technique in Purple Sweet Potato Powder Instant Beverage%包埋技术在速溶紫薯粉饮料生产中的应用

    Institute of Scientific and Technical Information of China (English)

    于学娟; 陈英乡; 李银塔; 丛培杰

    2012-01-01

    Microencapsulation technology was used in the preparation of instant powder of Purple Sweetpotato.The process conditions were optimized.Spray drying was chosen in the preparation of instant powder of Purple Sweetpotato.By single factor and orthogonal experiment,the best condition for spray drying was: embedding agent the amount of β-cyclodextrin is 0.25% of the total weight,spray drying wind speed in 1 m~3/min,4 L/h,inlet temperature 130 ℃.%利用微胶囊包埋技术制备速溶紫薯粉,并确定了工艺条件。通过喷雾干燥制取速溶紫薯粉,采用单因素对比试验以及正交试验最终确定喷雾干燥的适宜工艺条件:包埋剂β-环状糊精添加量为总质量的0.25%;喷雾干燥工艺条件为:风速1 m3/min、进料量4 L/h、进口温度为130℃。

  19. Changes in sugar composition during baking and their effects on sensory attributes of baked sweet potatoes.

    Science.gov (United States)

    Chan, Chin-Feng; Chiang, Chih-Ming; Lai, Yung-Chang; Huang, Che-Lun; Kao, Shu-Chen; Liao, Wayne C

    2014-12-01

    The objective of this study was to evaluate the influence of sugar composition on the sensory attributes of seven baked sweet potatoes. The sugar composition was analyzed using high performance liquid chromatography. Results showed that the total sugar content of baked sweet potatoes increased significantly because of the formation of maltose. The maltose content dramatically increased after baking, and became the major sugar component of baked sweet potatoes. On the other hand, baked sweet potatoes were evaluated on a 7-point hedonic scale for sensory analysis. Overall acceptability results showed that the panelists preferred baked CYY95-26 and TNG66 over the other baked varieties. Because the correlation between overall acceptability and sweetness was the highest (r = 0.69, p baked sweet potatoes. Although sugar composition changed on baking, the overall acceptability of baked sweet potatoes was highly associated with the sucrose content.

  20. Physicochemical properties of starches obtained from three varieties of Chinese sweet potatoes.

    NARCIS (Netherlands)

    Chen Zenghong,; Schols, H.A.; Voragen, A.G.J.

    2003-01-01

    Starches isolated from 3 typical types of Chinese sweet potato varieties (XuShu18, SuShu2, and SuShu8) were characterized and compared with starches isolated from potato and mung bean. The 3 sweet potato starches differed in granule size; particle size distribution; protein, lipid, and phosphorus co

  1. Bioethanol production from sweet potato using Saccharomyces diastaticus

    Science.gov (United States)

    Abdullah, Suryani, Irma; Pradia Paundradewa, J.

    2015-12-01

    Sweet potato contains about 16 to 40% dry matter and about 70-90% of the dry matter is a carbohydrate made up of starch, sugar, cellulose, hemicellulose and pectin so suitable for used as raw material for bioethanol. In this study focused on the manufacture of bioethanol with changes in temperature and concentration variations of yeast with sweet potato raw materials used yeast Saccharomyces diastaticus. Operating variables used are at a temperature of 30°C; 31,475°C; 35°C; 38,525°C; and 40°C with a yeast concentration of 25.9%; 30%; 40%; 50% and 54.1%. The experimental results obtained, the optimum conditions of ethanol fermentation with yeast Saccharomyces diastaticus on 36,67 °C temperature and yeast concentration of 43,43 % v / v.

  2. Fertilization for High Yields in Corn-Sweet Potato-Wheat Rotation: A Systematic Approach to Nutrient Limiting Factors of Soils in Chongqing, China

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    A systematic approach was adopted to investigate the nutrient limiting factors in gray-brown purple soils and yellow soils derived from limestone in Chongqing, China, to study balanced fertilization for corn, sweet potato and wheat in rotation. The results showed that N, P and K were deficient in both soils, Cu, Mn, S andZn in the gray-brown purple soils and Ca, Mg, Mo and Zn for the yellow soils. Balanced fertilizer application increased yields of corn, sweet potato and wheat by 28.4%, 28.7% and 4.4%, respectively, as compared to the local farmers' practice. The systematic approach can be considered as one of the most efficient and reliable methods in fertility study.

  3. Microbial deterioration of white variety sweet potato (Ipomoea batatas under different storage structures

    Directory of Open Access Journals (Sweden)

    Wisdom Amoa-Awua

    2010-01-01

    Full Text Available Post-harvest protection of white variety sweet potato (Ipomoea batatas has been dealt with rarely in the past, although it is comparatively easy to grow and has high consumer acceptability in Ghana. Microbial deterioration of sweet potato roots stored in three different storage structures was studied. The sweet potato roots initially cured for 7 and 14 days were stored in traditional, pit, and clamp storage structures for a maximum of 28 days. For the 7 days-cured sweet potato roots, the bac­teria population in the three different storage structures increased by 1.2-2.3 log cfu/g whereas for the 14 days-cured roots, the bacteria population was 0.1-1.0 log cfu/g within 28 days of storage. The fungal population in the 14 days-cured sweet potato roots was higher than in the 7 days-cured sweet potato roots by 0.6-1.6 log cfu/g for 28 days of storage. For both the 7 and 14 days-cured sweet potato roots, the sweet potato roots stored for 28 days in the three different storage structures had a higher microbial count compared to the sweet potato roots stored for 14 days. Aspergillus flavus was the most dominant fungal species occurring in all of the three different storage structures followed by A. niger, Rhizopus stolonifer, Tricho-derma viride, Fusarium oxysporum, Penicillium digitatum, Cladosporium herbarum,and Aspergillus ochraceus, in that order.

  4. Production of purple potato mackerel balls%紫薯鲐鱼鱼丸的制作

    Institute of Scientific and Technical Information of China (English)

    王岩

    2015-01-01

    Fish ball is popular among consumers for its deliciousness, nutritiousness and conven-ience. The mackerel and purple potato were taken as main raw materials to make fish balls. Through the quality evaluation,the effect of purple potato mackerel ball was satisfying.%鱼丸以其美味、营养与便捷倍受消费者青睐. 本文以紫薯和鲐鱼为主要原料试制紫薯鲐鱼丸,紫薯鲐鱼丸产品经质量评价,效果令人满意.

  5. 植物乳杆菌发酵紫薯粉对酸面团面包的抗氧化特性及品质影响%Antioxidant Properties of Bread Made from Purple Sweet Potato Powder (PSP) Sourdough Fermented by Lactobacillus plantarum

    Institute of Scientific and Technical Information of China (English)

    王宏兹; 王凤; 黄卫宁; RAYAS-DUARTE Patricia; 姚远

    2012-01-01

    采用紫薯粉和植物乳杆菌发酵紫薯粉制作富含花青素的面包,通过对比研究乳酸菌发酵紫薯粉对面包品质的影响;并探讨乳酸菌发酵紫薯粉对面包中花青素含量、总酚含量以及DPPH自由基清除率的影响。结果表明:相比紫薯粉面包,乳酸菌发酵紫薯粉使得面包pH值降低,总酸度(TTA)增加,面包比容有所减小,面包色度C*值增加而色相日。值减小,面包色泽由原来的浅紫色变为浅红色。感官评定的结果显示,采用紫薯粉或乳酸菌发酵紫薯粉制作的面包都为消费者所喜爱。同时,与紫薯粉面包相比,乳酸菌发酵紫薯粉面包的总酚含量和DPPH自由基清除率分别增加了90.8%和6.1%,增强了面包的抗氧化性。%Purple sweet potato powder (PSP) and Lactobacillus plantarum fermented PSP were separately used to prepare bread in this study. The effect of lactic acid bacteria (LAB) fermentation for PSP on the quality of bread make from PSP, anthocyanins content, total phenolic content and DPPH radical-scavenging activity was explored. The results showed that the bread made from LAB-fermented PSP had lower pH and higher TTA, and its specific volume revealed a decrease compared to that made from non-fermented PSP. After LAB fermentation, the color of PSP was changed from light purple to pink, and the chroma (C*) of the bread with LAB-fermented PSP increased while the hue (H*) decreased. Sensory evaluation of both bread samples could be accepted by consumers. The bread made from LAB-fermented PSP revealed an increase in total phenolic content and DPPH radical-scavenging activity by 90.8% and 6.1%, respectively compared to that made from non-fermented PSP. Therefore, LAB fermentation can enhance the antioxidant activity of PSP bread.

  6. Modeling of mass transfer performance of hot-air drying of sweet potato (Ipomoea Batatas L.) slices

    National Research Council Canada - National Science Library

    Zhu Aishi; Jiang Feiyan

    2014-01-01

    ... velocity and thickness of sweet potato slice on the drying process. The experimental data of moisture ratio of sweet potato slices were used to fit the mathematical models, and the effective diffusion coefficients were calculated...

  7. Development of biomarkers and a diagnostic tool for investigation of coinfections by and interactions between potato purple top and potato witches’-broom phytoplasmas in tomato

    Science.gov (United States)

    Columbia Basin potato purple top (PPT) phytoplasma and Alaska potato witches’-broom (PWB) phytoplasma are two closely-related but mutually distinct pathogenic bacteria that infect potato and other vegetable crops. Inhabiting phloem sieve elements and being transmitted by phloem-feeding insect vecto...

  8. Potential of Heterorhabditis indica to control Cylas formicarius in field culled sweet potato roots

    Science.gov (United States)

    Sweet potato weevil, Cylas formicarius, is one of the most destructive insect pests of sweet potato in Hawaii. The larvae feed and tunnel inside the root causing malformation and a bitter taste that makes the product unmarketable. During harvest, farmers leave off-grade roots in the field which se...

  9. Intercropping of two Leucaena spp. with sweet potato: yield, growth rate and biomass

    Energy Technology Data Exchange (ETDEWEB)

    Swift, J.F.

    1982-01-01

    Results of trials with Leucaena leucocephala and Leucaena diversifolia at Wau, Papua New Guinea, showed potential benefits of the agroforestry cropping system. The total biomass yield (sweet potato plus firewood and green manure) was considerably greater than the yield per unit area of sweet potato alone. 3 references.

  10. Chemical optimization of protein extraction from sweet potato (Ipomoea batatas) peel

    Science.gov (United States)

    Proteins isolated from sweet potatoes (Ipomoea batatas) have been shown to possess antidiabetic, antioxidant, and antiproliferative properties. The objective of this study was to chemically optimize a process for extracting proteins from sweet potato peel. The extraction procedure involved mixing pe...

  11. Life-cycle energy efficiency and environmental impacts of bioethanol production from sweet potato.

    Science.gov (United States)

    Wang, Mingxin; Shi, Yu; Xia, Xunfeng; Li, Dinglong; Chen, Qun

    2013-04-01

    Life-cycle assessment (LCA) was used to evaluate the energy efficiency and environmental impacts of sweet potato-based bioethanol production. The scope covered all stages in the life cycle of bioethanol production, including the cultivation and treatment, transport, as well as bioethanol conversion of sweet potato. Results show that the net energy ratio of sweet potato-based bioethanol is 1.48 and the net energy gain is 6.55 MJ/L. Eutrophication is identified as the most significant environmental impact category, followed by acidification, global warming, human toxicity, and photochemical oxidation. Sensitivity analysis reveals that steam consumption during bioethanol conversion exerts the most effect on the results, followed by sweet potato yields and fertilizers input. It is suggested that substituting coal with cleaner energy for steam generation in bioethanol conversion stage and promotion of better management practices in sweet potato cultivation stage could lead to a significant improvement of energy and environmental performance.

  12. Effects of Drying Processes on the Antioxidant Properties in Sweet Potatoes

    Institute of Scientific and Technical Information of China (English)

    YANG Jing; CHEN Jin-feng; ZHAO Yu-ying; MAO Lin-chun

    2010-01-01

    The effects of different drying methods (hot-air drying, microwave drying and vacuum-freeze drying) on the antioxidant activity and antioxidants in sweet potato (Ipomoea batatas L. Lam.) tubers were investigated to determine the potential drying process. Sweet potato tubers were cut into 5 mm thick slices, steamed at 100~C for 10 rain, then dried in either hot-air, microwave, or vacuum-freeze. The dried sweet potatoes in microwave possessed the highest antioxidant activity,while the lowest activity was observed in hot-air dried samples. The phenolic contents were positively correlated with scavenging activity and reducing power of DPPH+. The microwave drying retains the highest antioxidant activity with the highest content of phenolic compounds in dried sweet potatoes. β-carotene and ascorbic acid showed minor contribution to the antioxidant activity in dried sweet potatoes.

  13. Consumers Preferences to Sweet Potato Flakes (Spf from Sweet Potato Pasta as A Raw Material, with Enrichment Mung Bean Flour as Source Protein

    Directory of Open Access Journals (Sweden)

    Noveria Sjafrina

    2014-01-01

    Full Text Available Sweet potato flakes as an alternative food and a source of carbohydrates as breakfast cereals food. To meet the nutritional needs of sweet potato flakes contained in the primarily source of protein. The purpose of the research was a source of enrichment of protein contained in sweet potato flakes (SPF with the addition of mung bean flour.  And to get an optimal result of consumer preferences with the addition of mung bean flour optimal still be accepted by consumers based on organoleptic test. This study consists of several stages, namely the stage of making sweet potato pasta base material, formulation, manufacture flakes and organoleptic product. Experimental design using a completely randomized design, 5 treatment composition of sweet potato pasta and mung bean flour were (95 : 5%, (90 : 10%,(85 : 15%,(80: 20% and(75: 25% with 3 replications. The best formula will be determined by organoleptic and physical and chemical analysis. Data were collected for chroma color, moisture content, proximat, crispness (texture and resistance crisp during the presentation of the milk solution. Sweet potato flakes was getting a balanced nutritional content and better nutrional content after enrichment with mung bean flour protein content  Sweet potato flakes which become water content 5.6713% - 6.2435%, ash content 2.7501% - 3.0858%, 4.4765% protein content up to 9,0908%, carbohydrate content of 80.2744% - 85.7119%. The level of enrichment of proteins by the addition of mung bean flour to sweet potato flakes most preferred and acceptable panelists as consumer to the addition of 10% mung bean flour.

  14. Study on Response Surface Optimization Purple Potato Rice Wine Fermentation%响应面法优化紫薯糯米酒发酵研究

    Institute of Scientific and Technical Information of China (English)

    曹德玉

    2015-01-01

    In this experiment, we partially replaced purple sweet potato with glutinous rice, mixed them together and fermented, through which a new and nutritious rice wine with a unique color could be created. Eveluated with a standard of sweetness, acidity, alcohol content of fermented sweet wine as well as sensory index, Box-Behnken experiment to determine the best formula for the added amount of purple potato (X1) 25%by single factor and response surface, add the amount of koji (X2) was 1.26%and fermentation time (X3) for 70 h. At this point the wine has a rich, sweet, sweet and refreshing taste of alcohol, nutrient-rich.%将紫薯替代部分糯米混合后,经发酵制得一种具有独特色泽、营养价值高的新型甜米酒。以发酵后甜酒的糖度,酸度,酒精度及感官指标为标准,通过单因素和响应面中Box-Behnken试验确定最佳配方为紫薯添加量(X1)25%,酒曲添加量(X2)为1.26%和发酵时间(X3)为70 h。此时的米酒具有浓郁的甜香,口感醇甜爽口,营养丰富。

  15. PHYSICOCHEMICAL CHARACTERISTICS OF TUBERS FROM ORGANIC SWEET POTATO ROOTS

    Directory of Open Access Journals (Sweden)

    KAMILA DE OLIVEIRA DO NASCIMENTO

    2015-01-01

    Full Text Available This work aimed to determine instead at determining chemical composition, nutritional aspects and morphological characteristic of tubers from sweet potato roots (Ipomoea batatas L. of cultivars Rosinha de Verdan, Capivara and orange-fleshed produced under the organic system. The chemical composition of flours from sweet potato (SP roots was different among cultivars. The starch content for SP cultivar ranged from 26-33 % (d. b., and the orange-fleshed roots presented 3182 μg of β-carotene/100 g. The flour yield ob-tained for SPF processing was higher in Rosinha de Verdan (25.40%, and the starch content of roots ranged from 12.48-27.63 % (d.b.. The processing condition modified the starch granular characteristics of the flours and reduced 31% the carotene content and vitamin A value of the orange-fleshed flour. The orange-fleshed flour presented higher levels of carbohydrate, starch and total energy value (TEV than others white fleshed flour. The consumption of serving size of orange-fleshed roots and flour provided higher provitamin A require-ments for children.

  16. Reaction of sweet pepper to the potato virus y (PVYm

    Directory of Open Access Journals (Sweden)

    Echer Márcia de Moraes

    2002-01-01

    Full Text Available Traditional sweet pepper cultivars showing susceptibility to the Potato virus Y (PVY are being replaced by resistant hybrids with higher commercial value. Despite of much information about resistance source reaction and their inheritance, there is no knowledge about the genetic background of commercial resistant hybrids. Reaction of sweet pepper (Capsicum annuum L. hybrids to the Potato virus Y (PVYm such as Acuario, Magali R, Nathalie and their respective generations F2 and F3 as well as hybrids Amanda, Corteso W208, CPC-6272, Dagmar, Elisa, Magali, Margarita, Monteiro, Quantum, Vivo W205 was evaluated. Reaction to PVYm was evaluated as resistant or susceptible. Magali R and Nathalie hybrid did not show any mosaic symptoms. Magali R and Nathalie hybrids resistance is due to a single dominant gene indicating resistant versus susceptible parental lines crossing pedigree. Amanda, Acuario, Corteso W208, Dagmar, Elisa, Margarita, Monteiro, Quantum and Vivo W205, considered resistant to PVY, were highly susceptibility to PVY strain m. Hybrids, claimed as resistant to the Pepper mottle virus (PepMoV, were also resistant to PVYm.

  17. Modification of Cilembu sweet potato starch with ethanoic acid

    Science.gov (United States)

    Mahmudatussa'adah, A.; Rahmawati, Y.; Sudewi

    2016-04-01

    Cilembu sweet potato harvest was abundant, its use was still limited. Starch was required by various industries. Starch is generally beige, and requires a long time for the drying process. The purpose of this research was to produce a modified starch with ethanoic acid. The method used in this study was the experimental method. The results showed acid modified starch yield was 18%, with the color characteristics of L*: 96.38 ± 0.82; a*: -0.70±0.02 b*: 2.70±0.03 C: 2.79±0.02. Native starch yield was 16%, with the color characteristics of L*: 93.55 ± 0.91; a*: -0.86±0.06 b*: 2.93±0.04 C: 3.05±0.03. The conclusion of this study was modified starch of Cilembu sweet potato using ethanoic acid have higher yield and more white bright than native starch.

  18. Starch digestibility and predicted glycemic index of fried sweet potato cultivars

    OpenAIRE

    2012-01-01

    Background: Sweet potato (Ipomoea batatas L.) is a very rich source of starch. There is increased interest in starch digestibility and the prevention and management of metabolic diseases.Objective: The aim of this study was to evaluate the levels of starch fractions and predicted glycemic index of different cultivars of sweet potato. Material and Method: French fries produced from five cultivars of sweet potato (‘Ginseng Red’, ‘Beauregard’, ‘White Travis’, ‘Georgia Jet clone #2010’ and ‘G...

  19. The Potency and Utilization of Cassava and Sweet Potato Leaves as Feed Resources for Small Ruminant

    OpenAIRE

    Juniar Sirait; K Simanihuruk

    2010-01-01

    Cassava and sweet potato leaves are agricultural byproducts which are potential to be utilized as feed for small ruminants. In year 2009, it is assumed that dry matter productions of cassava and sweet potato leaves are 2,590,929 and 348,008 tons, respectively. Cassava and sweet potato leaves, both contain high level of protein (> 20%) so that they are good protein sources for goats. Cassava leaves, however, contain cyanide acid (HCN) that varied depended on the age and require wilting process...

  20. Mechanical properties of sweet potato vine and stalk during harvest%甘薯收获期藤蔓茎秆的机械特性

    Institute of Scientific and Technical Information of China (English)

    胡良龙; 王公仆; 凌小燕; 王冰; 王伯凯; 游兆延

    2015-01-01

    be combined, in order to prove mechanical properties of sweet potato vine and stalk during harvest and working quality of sweet potato vine crushing and returning testing machine. In this paper, the types of fresh purple sweet potato Ningzi 1 and Ningzi 2 in Nanjing, Jiangsu Province were regarded as the tested subject, the electronic universal testing machine, electric drying oven with forced convection, and sweet potato vine crushing and returning testing machine etc. were applied, and the change of moisture percentage and shear strength of sweet potato stalk during harvest were studied. The results showed that at the beginning of experience harvest period, when the percentage of moisture were 81.5% and 78.1%, the shear force were 90.1 and 94.8 N, respectively, during 18 testing days the moisture percentage of sweet potato stalk reduced by 14.8% and 13.97%, respectively, but the shear force of stalk increased by 36.3 and 37.5 N respectively, which showed that the moisture percentage of sweet potato stalk was lower and the shear force was larger as the growth time of plants went on. The internal relations between mechanical crushing quality and percentage of moisture, shear strength were revealed: during the testing period of 18 days, the qualified rates of vine’s crushing length for sweet potato type Ningzi 1 and Ningzi 2 dropped by 6.3% and 6.7% respectively, stubble length on top ridge increased by 3.6 and 4.4 cm respectively, which showed that with the increasing of the growth period and the rising of stalk’s shear force, the working quality of sweet potato vine crushing and returning machine declined. The quadratic function regression equations on the change between shearing force and moisture percentage of the two types of fresh purple sweet potatoes’ stalk were obtained with Matlab when the percentage of moisture was 86.92%-70.08%, and the fitting coefficient of determinationR2 both reached above 0.99. From the point of increasing the quality of

  1. Improvement of sweet potato yield using mixtures of ground fish bone and plant residues

    Directory of Open Access Journals (Sweden)

    A C Novianantya

    2017-01-01

    Full Text Available The Indonesian government begins to promote food diversification program. The government expects the Indonesian people can consume food crops other than rice, such as wheat, potatoes and sweet potatoes. While, the level of production of sweet potato production decreased in the period of 2012-2015 with total production of only 2,218,992 t/ha. In an effort to increase the production of sweet potato, improvements are needed through application of organic fertilizers like composts. The purpose of this study was to explore the effect of composted manure with ground fish bone, legume residues, and Tithonia on soil chemical properties and sweet potato production includes tuber weight and levels of starch sweet potato crops.The results showedthat application of 5 t compost/ha and 35 kg Trichoderma biofertilizer/ha increased pH, water content, organic carbon, total N, available P, total Kl, CEC,exchangeable Ca, plant height, tuber weight and levels of sweet potato starc

  2. Anti-ulcer activity of Ipomoea batatas tubers (sweet potato

    Directory of Open Access Journals (Sweden)

    Vandana Panda

    2012-04-01

    Full Text Available Background: Peptic ulcers occur in that part of the gastrointestinal tract which is exposed to gastric acid and pepsin, i.e., the stomach and duodenum. Gastric and duodenal ulcers are common pathologies that may be induced by a variety of factors such as stress, smoking and noxious agents including non-steroidal anti-inflammatory drugs. Ipomoea batatas tubers (sweet potato contain ample amounts of antioxidants. It has been proven already by many scientific studies that antioxidants have ulcer healing properties. In reference to this, we tried assessing the ulcer healing effect of Ipomoea batatas tubers. Methods: The anti-ulcer activity of the tubers of Ipomoea batatas (sweet potato was studied in cold stress and aspirin-induced gastric ulcers in Wistar rats. Methanolic extracts of Ipomoea batatas tubers (TE at two doses, viz., 400 and 800 mg /kg were evaluated in cold stress and aspirin-induced gastric ulcer models using cimetidine and omeprazole respectively as standards. The standard drugs and the test drugs were administered orally for 7 days in the cold stressmodel and for 1 day in the aspirin-induced gastric ulcer model. Gastroprotective potential, status of the antioxidant enzymes {superoxide dismutase (SOD, catalase (CAT, glutathione peroxidase (GPx and glutathione reductase(GR} along with GSH, and lipid peroxidation were studied in both models. Results: The results of the present study showed that TE possessed gastroprotective activity as evidenced by its significant inhibition of mean ulcer score and ulcer index and a marked increase in GSH, SOD, CAT, GPx, and GR levels and reduction in lipid peroxidation in a dose dependant manner.Conclusion: The present experimental findings suggest that tubers of Ipomoea batatas may be useful for treating peptic ulcers.

  3. Microbial Growth and the Effects of Mild Acidification and Preservatives in Refrigerated Sweet Potato Puree

    National Research Council Canada - National Science Library

    Perez-Diaz, Ilenys M; Truong, Van-Den; Webber, Ashlee; McFeeters, Roger F

    2008-01-01

    .... Because the puree was made by comminuting steam-cooked sweet potatoes before refrigeration, no naturally occurring vegetative bacterial cells were detected during a 4-week period of refrigerated storage at 4°C...

  4. and Boiling on Pro-Vitamin A Content in Sweet Potato (Ipomoea

    African Journals Online (AJOL)

    To maximize the availability of pro-vitamin A carotenoids in sweet potato and to recommend the appropriate start of piecemeal ..... sufficicnt levels of retinol equivalents to meet this criteria. .... molecular weight fragments associated with further ...

  5. The effects of electrolysis at room temperature on retrogradation of sweet potato starch.

    Science.gov (United States)

    Xijun, Lian; Kunsheng, Zhang; Qingfeng, Luo; Xu, Zhang; Shuyi, Zhao

    2012-01-01

    The effects of electrolysis at room temperature on formation of sweet potato retrograded starch were studied by photographic method in the paper. The optimal parameters of electrolytic preparation of sweet potato retrograded starch were determined. The ratio between sweet potato starch and water was 10 g/100 mL with addition of NaCl 1.0 g/100 mL, pH value of the solution was 6.0 and the solution was electrolyzed for 30 min at 90 V at room temperature, then it was stored at 4°C for 24h after being autoclaved for 30 min at 120°C, the retrogradation rate of sweet potato starch at this condition was 33.1%, which is 138% higher than that of control group. Four possible reasons are put forward to explain the results.

  6. Malt hydrolysis of sweet-potatoes and eddoes for ethanol production

    Energy Technology Data Exchange (ETDEWEB)

    Hosein, Rhonda; Mellowes, W.A. (University of the West Indies, St. Augustine, Trinidad. Dept. of Chemical Engineering)

    1989-01-01

    In the Caribbean the main root crops produced are cassava, sweet-potatoes, eddoes, dasheen and yam. The production of ethanol from these starchy substrates first requires the hydrolysis of the starch into simpler sugars. Hydrolysis can be performed enzymatically or by means of acids. The root crops selected for study were sweet-potatoes (Ipomoea batatas) and eddoes (Colocasia antiquorum esculenta var. globulifera). They were hydrolysed using the enzymes contained in malt. The sugars obtained under the above conditions were 5.6 and 5.4% (w/v) for sweet-potatoes and eddoes, respectively. The corresponding starch conversions were 88 and 92%. Fermentation of the above hydrolysates gave alcohol in the region of 2.3 and 2.2% (v/v) for sweet-potatoes and eddoes, respectively. The conversion of sugar to alcohol was 91 and 89%. (author).

  7. Genetic dissimilarity among sweet potato genotypes using morphological and molecular descriptors

    Directory of Open Access Journals (Sweden)

    Elisângela Knoblauch Viega de Andrade

    2017-08-01

    Full Text Available This study aimed to evaluate the genetic dissimilarity among sweet potato genotypes using morphological and molecular descriptors. The experiment was conducted in the Olericulture Sector at Federal University of Jequitinhonha and Mucuri Valleys (UFVJM and evaluated 60 sweet potato genotypes. For morphological characterization, 24 descriptors were used. For molecular characterization, 11 microsatellite primers specific for sweet potatoes were used, obtaining 210 polymorphic bands. Morphological and molecular diversity was obtained by dissimilarity matrices based on the coefficient of simple matching and the Jaccard index for morphological and molecular data, respectively. From these matrices, dendrograms were built. There is a large amount of genetic variability among sweet potato genotypes of the germplasm bank at UFVJM based on morphological and molecular characterizations. There was no duplicate suspicion or strong association between morphological and molecular analyses. Divergent accessions have been identified by molecular and morphological analyses, which can be used as parents in breeding programmes to produce progenies with high genetic variability.

  8. Molecular Characterization of Five Potyviruses Infecting Korean Sweet Potatoes Based on Analyses of Complete Genome Sequences

    Directory of Open Access Journals (Sweden)

    Hae-Ryun Kwak

    2015-12-01

    Full Text Available Sweet potatoes (Ipomea batatas L. are grown extensively, in tropical and temperate regions, and are important food crops worldwide. In Korea, potyviruses, including Sweet potato feathery mottle virus (SPFMV, Sweet potato virus C (SPVC, Sweet potato virus G (SPVG, Sweet potato virus 2 (SPV2, and Sweet potato latent virus (SPLV, have been detected in sweet potato fields at a high (~95% incidence. In the present work, complete genome sequences of 18 isolates, representing the five potyviruses mentioned above, were compared with previously reported genome sequences. The complete genomes consisted of 10,081 to 10,830 nucleotides, excluding the poly-A tails. Their genomic organizations were typical of the Potyvirus genus, including one target open reading frame coding for a putative polyprotein. Based on phylogenetic analyses and sequence comparisons, the Korean SPFMV isolates belonged to the strains RC and O with >98% nucleotide sequence identity. Korean SPVC isolates had 99% identity to the Japanese isolate SPVC-Bungo and 70% identity to the SPFMV isolates. The Korean SPVG isolates showed 99% identity to the three previously reported SPVG isolates. Korean SPV2 isolates had 97% identity to the SPV2 GWB-2 isolate from the USA. Korean SPLV isolates had a relatively low (88% nucleotide sequence identity with the Taiwanese SPLV-TW isolates, and they were phylogenetically distantly related to SPFMV isolates. Recombination analysis revealed that possible recombination events occurred in the P1, HC-Pro and NIa-NIb regions of SPFMV and SPLV isolates and these regions were identified as hotspots for recombination in the sweet potato potyviruses.

  9. Characterization of silage made from sweet potato vines using corn meal as additive

    OpenAIRE

    A. A. Corrêa; BACKES, A. A.; Fagundes,J. L.; BARBOSA, L. T.; SOUSA, B. M. de L.; OLIVEIRA, V. de S.; Moreira, A L

    2016-01-01

    The objective of this study was to investigate the fermentative and nutritional characteristics of sweet potato (Ipomoea batatas) vine silage using different levels of corn meal as additive. A completely randomized design consisting of seven levels of the additive (0, 5, 10, 15, 20, 25 and 30% corn meal) and four replicates was used, totaling 28 laboratory mini-silos (experimental units). The different levels of additive in sweet potato vine silage exerted quadratic effects on the content of ...

  10. Agroinfection of sweet potato by vacuum inifltration of an infectious sweepovirus

    Institute of Scientific and Technical Information of China (English)

    Huiping Bi; Peng Zhang

    2014-01-01

    Sweepovirus is an important monopartite begomovirus that infects plants of the genus Ipomoea worldwide. Development of artiifcial infection methods for sweepovirus using agroinoculation is a highly efficient means of studying infectivity in sweet potato. Unlike other begomoviruses, it has proven difficult to infect sweet potato plants with sweepoviruses using infectious clones. A novel sweepovirus, called Sweet potato leaf curl virus-Jiangsu (SPLCV-JS), was recently identiifed in China. In addition, the infectivity of the SPLCV-JS clone has been demonstrated in Nicotiana benthamiana. Here we describe the agroinfection of the sweet potato cultivar Xushu 22 with the SPLCV-JS infectious clone using vacuum inifltration. Yellowing symptoms were observed in newly emerged leaves. Molecular analysis confirmed successful inoculation by the detection of viral DNA. A synergistic effect of SPLCV-JS and the heterologous betasatellite DNA-βof Tomato yellow leaf curl China virus isolate Y10 (TYLCCNV-Y10) on enhanced symptom severity and viral DNA accumulation was conifrmed. The development of a routine agroinoculation system in sweet potato with SPLCV-JS using vacuum inifltration should facilitate the molecular study of sweepovirus in this host and permit the evaluation of virus resistance of sweet potato plants in breeding programs.

  11. Adding sweet potato vines improve the quality of rice straw silage.

    Science.gov (United States)

    Li, Ping; Ji, Shuren; Wang, Qian; Qin, Mengzhen; Hou, Chen; Shen, Yixin

    2016-08-23

    Rice straw and sweet potato vines are the main by-products of agricultural crops, and their disposal creates problems for the environment in the south of China. In order to establish an easy method for making rice straw silage successfully, experiments were conduct to evaluate fermentation quality and nutritive value of rice straw silages ensiled with or without sweet potato vine. Paddy rice straw (PR) and upland rice straw (UP) were ensiled alone or with sweet potato vines (SP) by a ratio of 1:1 (fresh matter basis), over 3 years. Compared with rice straw silages ensiled alone, the mixed-material silages (PR + SP, UR + SP) showed higher fermentation quality with lower propionic acid content and NH3 -N ratio of total N, and higher (P straw and sweet potato vines in the regions where rice and sweet potato are harvested at same season, and the sweet potato vines have the potential to improve rice straw fermentation quality with low water soluble carbohydrate content in south of China.

  12. Role of nematodes, nematicides, and crop rotation on the productivity and quality of potato, sweet potato, peanut, and grain sorghum.

    Science.gov (United States)

    Johnson, A W; Dowler, C C; Glaze, N C; Handoo, Z A

    1996-09-01

    The objective of this experiment was to determine the effects of fenamiphos 15G and short-cycle potato (PO)-sweet potato (SP) grown continuously and in rotation with peanut (PE)-grain sorghum (GS) on yield, crop quality, and mixed nematode population densities of Meloidogyne arenaria, M. hapla, M. incognita, and Mesocriconema ornatum. Greater root-gall indices and damage by M. hapla and M. incognita occurred on potato than other crops. Most crop yields were higher and root-gall indices lower from fenamiphos-treated plots than untreated plots. The total yield of potato in the PO-SP and PO-SP-PE-GS sequences increased from 1983 to 1985 in plots infested with M. hapla or M. arenaria and M. incognita in combination and decreased in 1986 to 1987 when root-knot nematode populations shifted to M. incognita. The total yields of sweet potato in the PO-SP-PE-GS sequence were similar in 1983 and 1985, and declined each year in the PO-SP sequence as a consequence of M. incognita population density increase in the soil. Yield of peanut from soil infested with M. hapla increased 82% in fenamiphos-treated plots compared to untreated plots. Fenamiphos treatment increased yield of grain sorghum from 5% to 45% over untreated controls. The declining yields of potato and sweet potato observed with both the PO-SP and PO-SP-PE-GS sequences indicate that these crop systems should not be used longer than 3 years in soil infested with M. incognita, M. arenaria, or M. hapla. Under these conditions, these two cropping systems promote a population shift in favor of M. incognita, which is more damaging to potato and sweet potato than M. arenaria and M. hapla.

  13. Sweet potato weevil (Cylas formicarius) incidence in the humid lowlands of Papua New Guinea

    NARCIS (Netherlands)

    Powell, K.S.; Hartemink, A.E.; Eganae, J.F.; Walo, C.; Poloma, S.

    2001-01-01

    Sweet potato is the main staple crop in PNG and this paper presents a study from the humid lowlands of the Morobe Province. Three experiments were carried out at two locations (Hobu and Unitech) to evaluate the effect of inorganic fertiliser inputs and fallow vegetation on the incidence of sweet

  14. Sweet potato weevil (Cylas formicarius) incidence in the humid lowlands of Papua New Guinea

    NARCIS (Netherlands)

    Powell, K.S.; Hartemink, A.E.; Eganae, J.F.; Walo, C.; Poloma, S.

    2001-01-01

    Sweet potato is the main staple crop in PNG and this paper presents a study from the humid lowlands of the Morobe Province. Three experiments were carried out at two locations (Hobu and Unitech) to evaluate the effect of inorganic fertiliser inputs and fallow vegetation on the incidence of sweet pot

  15. Carotenoid profile and retention in yellow-, purple- and red-fleshed potatoes after thermal processing.

    Science.gov (United States)

    Kotíková, Zora; Šulc, Miloslav; Lachman, Jaromír; Pivec, Vladimír; Orsák, Matyáš; Hamouz, Karel

    2016-04-15

    This research aimed to investigate the effect of thermal processing on carotenoid profile, quantity and stability in 22 colour-fleshed potato cultivars grown in the Czech Republic. The total of nine carotenoids was analysed by HPLC using a C30 column and PDA detection. The total carotenoid content for all cultivars ranged from 1.44 to 40.13 μg/g DM. Yellow cultivars showed a much higher average total carotenoid content (26.22 μg/g DM) when compared to red/purple-fleshed potatoes (5.69 μg/g DM). Yellow cultivars were dominated by antheraxanthin, whereas neoxanthin was the main carotenoid in red/purple cultivars. Thermal processing significantly impacted all potato cultivars. Boiling decreased the total carotenoids by 92% compared to baking (88%). Lutein was the most stable carotenoid against thermal processing (decreased by 24-43%) followed by β-carotene (decreased by 78-83%); other carotenoids were degraded nearly completely. Increased formation of (Z)-isomers by thermal processing has not been confirmed.

  16. Field evaluation of yield effects on the U.S.A. heirloom sweet potato cultivars infected by sweet potato leaf curl virus

    Science.gov (United States)

    The incidence of Sweet potato leaf curl virus (SPLCV), a Begomovirus, infection of sweetpotato Ipomoea batatas (L.) Lam. (Convolvulaceae) in South Carolina, USA has increased rapidly in recent years. This is likely due to the use of infected propagating materials and the increasing population of it...

  17. EVALUATION OF NUTRITION AND GLYCEMIC INDEX OF SWEET POTATOES AND ITS APPROPRIATE PROCESSING TO HYPOGLYCEMIC FOODS

    Directory of Open Access Journals (Sweden)

    Made Astawana

    2011-04-01

    Full Text Available Indonesia placed the fourth biggest diabetics in the world after India, China, and the USA with prevalence amounting to 8.6% of the population. Diabetes is an abnormal carbohydrate metabolism. Therefore, nutrition plays a key role in the management of the disease. This study aimed to find hypoglycemic sweet potatoes and appropriate processing to create low glycemic foods. Eight Indonesian sweet potato varieties/clones were used in this experiment, i.e. Kidal, Sukuh, Sari, Ungu, Jago, BB00105.10, B0464, and BB00106.18. Samples were firstly analyzed for their physicochemical and nutritional properties, which then followed by evaluation of their hypoglycemic responses. The selected variety was processed into three different basic processing methods, i.e. boiling, baking, and frying, and then their glycemic indexes (GI were evaluated. Result showed that among eight sweet potato varieties/clones studied, BB00105.10 clone indicated the best hypoglycemic response. The highest hypoglycemic activity was supported with the highest resistant starch content (3.8%, protein content (5.47%, and low starch digestibility (51.4%. The sweet potato tubers contained medium to high amylose (24.94%. Processing methods influenced the GI value of foods. Fried sweet potatoes had the lowest GI (47, followed by the boiled one (GI = 62 and the baked one (GI = 80.

  18. Preparation and evaluation of sweet potato starch-blended sodium alginate microbeads

    Directory of Open Access Journals (Sweden)

    Jha Antesh

    2009-01-01

    Full Text Available The design of effective drug delivery systems has recently become an integral part of the development of new medicines. Hence, research continuously keeps searching for ways to deliver drugs over an extended period of time with a well- controlled release profile. The ionotropic gelation method was used to prepare sweet potato starch-blended controlled release alginate microbeads of ibuprofen. Sweet potato is an important crop in many developing countries. Although sweet potato originated from Central America, its ability to adapt to a wide variety of climatic conditions allows it to grow both in tropical and in moderate temperature regions of Africa, Asia and the Americas. The influence of various formulation factors such as in vitro drug release, entrapment efficiency, swelling study and micrometric properties was investigated. Other variables included sweet potato starch concentration, percentage drug loading, curing time, cross-linking agent and stirring speed during the microencapsulation process. The entrapment efficiencies were found in the range of 71.85 ± 2.04 - 94.53 ± 1.02%. The particle sizes were found in the range of 0.82 ± 0.006 - 1.08 ± 0.009 mm. This suggested that the ionotropic gelation method was successful in producing sweet potato starch-blended alginate microbeads.

  19. Examining the impact of climate change and variability on sweet potatoes in East Africa

    Science.gov (United States)

    Ddumba, S. D.; Andresen, J.; Moore, N. J.; Olson, J.; Snapp, S.; Winkler, J. A.

    2013-12-01

    Climate change is one of the biggest challenges to food security for the rapidly increasing population of East Africa. Rainfall is becoming more variable and temperatures are rising, consequently leading to increased occurrence of droughts and floods, and, changes in the timing and length of growing seasons. These changes have serious implications on crop production with the greatest impact likely to be on C4 crops such as cereals compared to C3 crops such as root tubers. Sweet potatoes is one the four most important food crops in East Africa owing to its high nutrition and calorie content, and, high tolerance to heat and drought, but little is known about how the crop will be affected by climate change. This study identifies the major climatic constraints to sweet potato production and examines the impact of projected future climates on sweet potato production in East Africa during the next 10 to 30 years. A process-based Sweet POTato COMputer Simulation (SPOTCOMS) model is used to assess four sweet potato cultivars; Naspot 1, Naspot 10, Naspot 11 and SPK 004-Ejumula. This is work in progress but preliminary results from the crop modeling experiments and the strength and weakness of the crop model will be presented.

  20. Utilization of sweet potatoes in controlled ecological life support systems (CELSS).

    Science.gov (United States)

    Hill, W A; Loretan, P A; Bonsi, C K; Morris, C E; Lu, J Y; Ogbuehi, C

    1989-01-01

    A number of studies have selected the sweet potato as a potentially important crop for CELSS. Most hydroponic studies of sweet potatoes have been short term (hydroponic systems were needed to understand the physiology of storage root enlargement and to evaluate sweet potato production potential for CELSS. Early and late maturing sweet potato varieties were crown in hydroponic systems of different types--static with periodic replacement, flowing with and without recirculation, aggregate, and non-aggregate. In a flowing system with recirculation designed at Tuskegee University using the nutrient film technique (NFT), storage root yields as high as 1790 g were produced with an edible growth rate of up to 66 g m-2 d-1 and a harvest index as high as 89% under greenhouse conditions. Preliminary experiments indicated high yields can be obtained in controlled environmental chambers. Significant cultivar differences were found in all systems studied. Nutritive composition of storage roots and foliage were similar to field-grown plants. The results indicate great potential for sweet potato in CELSS.

  1. Postharvest Quality and Physiological Behavior of Sweet Potato (Ipomoea batatas Lam.) Leaf Stalks Under Three Temperatures

    Institute of Scientific and Technical Information of China (English)

    PENG Yan; XU Yong-quan; DUAN Dao-fu; MAO Lin-chun

    2009-01-01

    Sweet potato (lpomoea batatas Lam.) leaf stalks were cut into 20 cm length, and stored at 20, 6, and 2℃. The respiration rate, ethylene production, ascorbic acid, free amino acid, total chlorophyll content, freshness, and shelf life were determined during storage to investigate the effect of storage temperatures on the quality and physiological responses in sweet potato leaf stalks. Wound responses were observed as high respiration rate and ethylene production immediately after cutting. Sweet potato leaf stalks were found to be sensitive to chilling injury manifested as browning and water-soaking on the surface at 2℃. In contrast, sweet potato leaf stalks were susceptible to senescence, exhibited by etiolating and yellowing, at 20℃. Loss in weight and chlorophyll was minimized under low temperatures. High temperatures also caused the accumulation of amino acids with a significant loss of ascorbic acid and chlorophyll. Sweet potato leaf stalks had a storage life of 16 days at 6℃, 8 days at 2℃, and 6 days at 20℃, respectively.

  2. Sweet potato (Ipomoea batatas) attenuates diet-induced aortic stiffening independent of changes in body composition.

    Science.gov (United States)

    Garner, Tyler; Ouyang, An; Berrones, Adam J; Campbell, Marilyn S; Du, Bing; Fleenor, Bradley S

    2017-08-01

    We hypothesized a sweet potato intervention would prevent high-fat (HF) diet-induced aortic stiffness, which would be associated with decreased arterial oxidative stress and increased mitochondrial uncoupling. Young (8-week old) C57BL/6J mice were randomly divided into 4 groups: low fat (LF; 10% fat), HF (60% fat), low-fat sweet potato (LFSP; 10% fat containing 260.3 μg/kcal sweet potato), or high-fat sweet potato diet (HFSP; 60% fat containing 260.3 μg/kcal sweet potato) for 16 weeks. Compared with LF and LFSP, HF- and HFSP-fed mice had increased body mass and percent fat mass with lower percent lean mass (all, P 0.05). Arterial stiffness, assessed by aortic pulse wave velocity and ex vivo mechanical testing of the elastin region elastic modulus (EEM) was greater in HF compared with LF and HFSP animals (all, P mitochondrial uncoupler, for 72 h reduced the EEM of HF arteries compared with nontreated HF segments (P mitochondrial uncoupling.

  3. Simultaneous Saccharification and Fermentation of Overnight Soaked Sweet Potato for Ethyl Alcohol Fermentation

    Directory of Open Access Journals (Sweden)

    B.K. Mishra

    2012-04-01

    Full Text Available The aim of the study is to develop an efficient method of production of ethyl alcohol by fermentation of sweet potato powder. The method emphasized on enhancement of "-amylase accessibility by overnight soaking of sweet potato powder and decreasing unwanted bacterial fermentation by utilizing simultaneous saccharification and fermentation. The crystalline structure of starch limits the accessibility of "-amylase to starch during enzymatic hydrolysis and thus reduces hydrolysis rate. This might be the reason for longer hydrolysis time. Effect of overnight soaking in water on eight variety of sweet potato was investigated followed by Simultaneous Saccharification and Fermentation (SSF. The result reflected the advantage of overnight soaking on "-amylase accessibility to starch, which favor higher hydrolysis rate. Implementing SSF, the fermentation process become efficient due to less free sugar at an instant and maximum efficiency of 96.7% was achieved in a 64.65% starch containing substrate.

  4. Effect of starch isolation method on properties of sweet potato starch

    Directory of Open Access Journals (Sweden)

    A. SURENDRA BABU

    2014-08-01

    Full Text Available Isolation method of starch with different agents influences starch properties, which provide attention for studying the most appropriate method for isolation of starch. In the present study sweet potato starch was isolated by Sodium metabisulphate (M1, Sodium chloride (M2, and Distilled water (M3 methods and these were assessed for functional, chemical, pasting and structural properties. M3 yielded the greatest recovery of starch (10.20%. Isolation methods significantly changed swelling power and pasting properties but starches exhibited similar chemical properties. Sweet potato starches possessed C-type diffraction pattern. Small size granules of 2.90 μm were noticed in SEM of M3 starch. A high degree positive correlation was found between ash, amylose, and total starch content. The study concluded that isolation methods brought changes in yield, pasting and structural properties of sweet potato starch.

  5. Sweet potato for closed ecological life support systems using the nutrient film technique

    Science.gov (United States)

    Loretan, P. A.; Hill, W. A.; Bonsi, C. K.; Morris, C. E.; Lu, J. Y.; Ogbuehi, C. R. A.; Mortley, D. G.

    1990-01-01

    Sweet potatoes were grown hydroponically using the nutrient film technique (NFT) in support of the Closed Ecological Life Support System (CELSS) program. Experiments in the greenhouse with the TI-155 sweet potato cultivar produced up to 1790 g/plant of fresh storage roots. Studies with both TI-155 and Georgia Jet cultivars resulted in an edible biomass index of approximately 60 percent, with edible biomass linear growth rates of 12.1 to 66.0 g m(exp -2)d(exp -1) in 0.05 to 0.13 sq meters in 105 to 130 days. Additional experimental results are given. All studies indicate good potential for sweet potatoes in CELSS.

  6. Development Characteristics,Problems and Recommendations of Sweet Potato Industry in Fuyang City

    Institute of Scientific and Technical Information of China (English)

    Zemin; FAN; Xinliang; LIU; Yuling; ZHU; Xiumei; WANG; Xiaolu; JIANG; Fengwu; XING

    2013-01-01

    The development of sweet potato industry in Fuyang City takes on following characteristics:increase in planting area of specialized households and professional cooperatives;increase in production input and yield;constant optimization of planting varieties;diversified planting modes.Sweet potato industry has made significant contribution to Fuyang City:(1)enriching types of agricultural products and promoting healthy diet;(2)driving development of agricultural product processing industry and increasing the employment rate of rural labor;(3)increasing financial revenue and rate of export-making foreign exchange of agricultural products;(4)increasing farmers’income and promoting new socialist countryside construction.In line with comparative advantages and existing problems of sweet potato industry in Fuyang City,it presents corresponding industrial development recommendations.

  7. Induction and use of artificial mutants in sweet potato

    Energy Technology Data Exchange (ETDEWEB)

    Marumine, Shokichi

    1984-03-01

    X-ray, ethylene imine, TSP and WCo were used as mutagen for sweet potato mutation breeding and visible variations were observed for all mutagen. In the case of WCo irradiation, mutation rate of skin color is 0.5-1.3% based on cutting. Direction and variation of dry matter and tuber yield of mutants which were induced by TSP and/or WCo irradiation showed more deteriorative variation than progressive variation but some induced mutant lines show same or superior characters than original line. In the case of TSP irradiation to tuber, obstruction is not so much up to dese of 10,000 ci per tuber but treatment of 330 ci per cutting approximate to LD50. By tuber treatment with WCo gamma rays, suppression of sprouting occurred in dose of 30kR. Tendency to increase a variation was not observed at higher doses. 50-200 ci per cutting or 300-500 ci per tuber in TSP treatment and 15 kR in WCo gamma-irradiation for tuber seemed to be optimum dosages. Hybrid seed of mutant selected for dry matter content was compared with that of original line and it was concluded that the variation of selected line was genetic. Mutant induced by TSP and WCo treatment was used as a parental material and progeny of the cross was selected for practical characters. As a result, a line of higher starch yield with high resistance to pest and disease was selected and this line was used as parental material of further breeding. (author).

  8. Scanning of transposable elements and analyzing expression of transposase genes of sweet potato [Ipomoea batatas].

    Directory of Open Access Journals (Sweden)

    Lang Yan

    Full Text Available BACKGROUND: Transposable elements (TEs are the most abundant genomic components in eukaryotes and affect the genome by their replications and movements to generate genetic plasticity. Sweet potato performs asexual reproduction generally and the TEs may be an important genetic factor for genome reorganization. Complete identification of TEs is essential for the study of genome evolution. However, the TEs of sweet potato are still poorly understood because of its complex hexaploid genome and difficulty in genome sequencing. The recent availability of the sweet potato transcriptome databases provides an opportunity for discovering and characterizing the expressed TEs. METHODOLOGY/PRINCIPAL FINDINGS: We first established the integrated-transcriptome database by de novo assembling four published sweet potato transcriptome databases from three cultivars in China. Using sequence-similarity search and analysis, a total of 1,405 TEs including 883 retrotransposons and 522 DNA transposons were predicted and categorized. Depending on mapping sets of RNA-Seq raw short reads to the predicted TEs, we compared the quantities, classifications and expression activities of TEs inter- and intra-cultivars. Moreover, the differential expressions of TEs in seven tissues of Xushu 18 cultivar were analyzed by using Illumina digital gene expression (DGE tag profiling. It was found that 417 TEs were expressed in one or more tissues and 107 in all seven tissues. Furthermore, the copy number of 11 transposase genes was determined to be 1-3 copies in the genome of sweet potato by Real-time PCR-based absolute quantification. CONCLUSIONS/SIGNIFICANCE: Our result provides a new method for TE searching on species with transcriptome sequences while lacking genome information. The searching, identification and expression analysis of TEs will provide useful TE information in sweet potato, which are valuable for the further studies of TE-mediated gene mutation and optimization in

  9. Sweet potato growth parameters, yield components and nutritive value for CELSS applications

    Science.gov (United States)

    Loretan, P. A.; Bonsi, C. K.; Hill, W. A.; Ogbuehi, C. R.; Mortley, D. G.

    1989-01-01

    Sweet potatoes have been grown hydroponically using the nutrient film technique (NFT) to provide a potential food source for long-term manned space missions. Experiments in both sand and NFT cultivars have produced up to 1790 g/plant of fresh storage root with an edible biomass index ranging from 60-89 percent and edible biomass linear growth rates of 39-66 g/sq m day in 105 to 130 days. Experiments with different cultivars, nutrient solution compositions, application rates, air and root temperatures, photoperiods, and light intensities indicate good potential for sweet potatoes in CELSS.

  10. Sweet potato growth parameters, yield components and nutritive value for CELSS applications

    Science.gov (United States)

    Loretan, P. A.; Bonsi, C. K.; Hill, W. A.; Ogbuehi, C. R.; Mortley, D. G.

    1989-01-01

    Sweet potatoes have been grown hydroponically using the nutrient film technique (NFT) to provide a potential food source for long-term manned space missions. Experiments in both sand and NFT cultivars have produced up to 1790 g/plant of fresh storage root with an edible biomass index ranging from 60-89 percent and edible biomass linear growth rates of 39-66 g/sq m day in 105 to 130 days. Experiments with different cultivars, nutrient solution compositions, application rates, air and root temperatures, photoperiods, and light intensities indicate good potential for sweet potatoes in CELSS.

  11. Ethanol fermentation of uncooked sweet potato with the application of enzymes

    Energy Technology Data Exchange (ETDEWEB)

    Svendsby, O. (Mahidol Univ., Bangkok, Thailand); Kakutani, K.; Matsumura, Y.; Iizuka, M.; Yamamoto, T.

    1981-01-01

    An attempt was made to simplify the ethanol fermentation of sweet potato tubers by using enzymes. The potato tubers were sterilized with acid, minced, and incubated at room temperature with enzymes and yeast. The ethanol fermentation of the mash proceeded along with saccharification of starch, and the ethanol produced after 5 days of incubation was estimated to be 100 g by weight per kg potato tubers. Pectin depolymerase was observed to allow glucoamylase to act easily on starch by reducing the viscosity of the incubation mash.

  12. [Nutritional evaluation of sweet potato cultivars Ipomea batata (L.) Lam used in bread as partial substitute of wheat flour].

    Science.gov (United States)

    Cárdenas, H; Kalinowski, J; Huaman, Z; Scott, G

    1993-12-01

    Four hundred and forty entries of sweet potato tubers from the International Potato Center were evaluated for chemical characteristics related to nutritional value. Dry matter range in the group was 15 to 45g/100g. The native entries DLP 2393, DLP 1120, DLP 2312, DLP 1908 and the foreign RCB 361F were selected for use in bread manufacture. Their average dry matter and crude protein was 38.5 and 9.2% respectively. Sweet potato bread was made replacing 30% of wheat flour with grinded sweet potato tubers. This bread had 11.0% crude protein in dry matter basis which were the same for bread made of wheat flour. There were no differences in organoleptic characteristics or protein quality (Apparent biological value: 37 vs 42%; apparent digestibility: 81 vs 80%; net protein utilization: 33 vs 39%) between sweet potato or full wheat flour breads respectively.

  13. Investigating the Skoog-Miller Model for Organogenesis Using Sweet Potato Root Explants.

    Science.gov (United States)

    Delany, William; And Others

    1994-01-01

    Describes an experiment in which groups of students in a plant tissue culture course worked together to test application of the Skoog-Miller model (developed by Skoog and Miller in regeneration of tobacco experiments to demonstrate organogenesis) to sweet potato root explants. (ZWH)

  14. Vacuolar invertases in sweet potato: molecular cloning, characterization, and analysis of gene expression.

    Science.gov (United States)

    Wang, Li-Ting; Wang, Ai-Yu; Hsieh, Chang-Wen; Chen, Chih-Yu; Sung, Hsien-Yi

    2005-05-01

    Two cDNAs (Ib beta fruct2 and Ib beta fruct3) encoding vacuolar invertases were cloned from sweet potato leaves, expressed in Pichia pastoris, and the recombinant proteins were purified by ammonium sulfate fractionation and chromatography on Ni-NTA agarose. The deduced amino acid sequences encoded by the cDNAs contained characteristic conserved elements of vacuolar invertases, including the sequence R[G/A/P]xxxGVS[E/D/M]K[S/T/A/R], located in the prepeptide region, Wxxx[M/I/V]LxWQ, located around the starting site of the mature protein, and an intact beta-fructosidase motif. The pH optimum, the substrate specificity, and the apparent K(m) values for sucrose exhibited by the recombinant proteins were similar to those of vacuolar invertases purified from sweet potato leaves and cell suspensions, thus confirming that the proteins encoded by Ib beta fruct2 and Ib beta fruct3 are vacuolar invertases. Moreover, northern analysis revealed that the expression of the two genes was differentially regulated. With the exception of mature leaves and sprouting storage roots, Ib beta fruct2 mRNA is widely expressed among the tissues of the sweet potato and is more abundant in young sink tissues. By contrast, Ib beta fruct3 mRNA was only detected in shoots and in young and mature leaves. It appears, therefore, that these two vacuolar invertases play different physiological roles during the development of the sweet potato plant.

  15. Investigating the Skoog-Miller Model for Organogenesis Using Sweet Potato Root Explants.

    Science.gov (United States)

    Delany, William; And Others

    1994-01-01

    Describes an experiment in which groups of students in a plant tissue culture course worked together to test application of the Skoog-Miller model (developed by Skoog and Miller in regeneration of tobacco experiments to demonstrate organogenesis) to sweet potato root explants. (ZWH)

  16. Improving properties of sweet potato composite flour: Influence of lactic fermentation

    Science.gov (United States)

    Yuliana, Neti; Nurdjanah, Siti; Setyani, Sri; Novianti, Dini

    2017-06-01

    The use of locally grown crops such as sweet potato as raw material for composite flour is considered advantageous as it reduces the importation of wheat flour. However the use of native sweetpotato flour has drawback properties when applied in the food. This study was aimed to modify sweet potato flour through six methods of lactic fermentation (spontaneous, pickle brine, Lb plantarum, Lc mesentereoides, a mixed of Lb plantarum and Lc mesentereoides, and mixed of Lb plantarum, Lc mesentereoides and yeast) to increase its properties in composite flour. Composite flours were obtained after fermentation of sweet potato slices for 48h in the proportion of 50% sweet potatoes flour and 50% wheat flour. pH, moisture content, swelling power, solubility, and pasting properties were determined for the fermented and unfermented composite flours. The results indicated that the composite fermented flours had better properties than those of non fermented flour. Fermentation increased swelling power, moisture content, meanwhile, solubility, and pH, deacresed. Amylose leaching, however, was not significantly affected by the fermentation process.

  17. Physicochemical properties of sweet potato starches and their application in noodle products

    NARCIS (Netherlands)

    Chen Zenghong,

    2003-01-01

    Starches isolated from 3 Chinese sweet potato varieties (XuShu18, SuShu2, and SuShu8) differed in granule size and particle size distribution as well as in protein, lipid and phosphorus contents but theamylosecontents were similar for these starches (19.3-20.0%). The pastin

  18. In vivo wound healing and antiulcer properties of white sweet potato (Ipomoea batatas

    Directory of Open Access Journals (Sweden)

    Daniele Hermes

    2013-07-01

    Full Text Available The potential of tuber flour of Ipomoea batatas (L. Lam. cv. Brazlândia Branca (white sweet potato as wound healing and antiulcerogenic agent was investigated in vivo in animal model. Excision on the back of Wistar rats was performed to induce wounds that were topically treated with Beeler’s base containing tuber flour of white sweet potato at 2.5%. Number of cells undergoing metaphase and the degree of tissue re-epithelialization were investigated 4, 7 and 10 days post-treatment. The protective effect of aqueous suspension of tuber flour (75 and 100 mg/kg animal weight on gastric mucosa of Wistar rats was also studied by using the ethanol-induced ulceration model. Ointment based on white sweet potato at 2.5% effectively triggered the healing of cutaneous wound as attested by the increased number of cells undergoing metaphase and tissue re-epithelialization regardless the time of wound treatment. Tuber flour potentially prevented ethanol-induced gastric ulceration by suppressing edema formation and partly protecting gastric mucosa wrinkles. Crude extracts also exhibited potential as free radical scavengers. The results from animal model experiments indicate the potential of tuber flour of white sweet potato to heal wounds.

  19. PRODUK EKSTRUSI BERBASIS TEPUNG UBI JALAR [Extrusion product made from sweet potato

    Directory of Open Access Journals (Sweden)

    Umar Santoso1

    2007-06-01

    Full Text Available The objective of the research was to develop a method to prepare extruted product from sweet potato and rice flour with addition of karabenguk as the protein source. The ratio of sweet potato and rice flour were 90:10; 75:25; and 55:45, and the addition of korobenguk flour varied from 0.5;1.0to 1.5 % (on the mixture basis. The first step was to determine the optimum condition for extrusion process. The extruded product was evaluated for its chemical, physical, and sensory properties. The results showed that the extruded products can be produced from sweet potato and rice flour in all ratios experimented. The addition of korobenguk flour appeared to increase protein, fat, and ash contents but decrease the extension degree the extension degree, crispness, and water absorption index. Based on the sensory evaluation, the most preferred product was that prepared from 55% sweet potato flour, 45% rice flour, and addition of 0.5% korobenguk flour (on the basis of the dough with moisture content of 15 %.

  20. Integrated nutrient management research with sweet potato in Papua New Guinea

    NARCIS (Netherlands)

    Hartemink, A.E.

    2003-01-01

    This paper summarizes a series of field experiments that investigated the effects of organic and inorganic nutrients on sweet potato tuber yield in the humid lowlands of Papua New Guinea. In the first experiment, plots were planted with Piper aduncum, Gliricidia sepium and Imperata cylindrica, which

  1. Physiological Indices and Selection of Methods on Rapid Identification for Sweet Potato Drought Resistance

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    The relationships between the changes of relative water content (RWC), malondialdehyde (MDA) contents, superoxide dismutase (SOD) activity and free proline contents in sweet potato leaves, and drought resistant ability under different concentration of polyethylene glycol (PEG) treatment applied at rhizosphere of sweet potato seedlings were studied. A highly positive correlation between RWC and drought resistance (r =0.783, P<0.01), a highly negative correlation between MDA contents and drought resistance (r = -0.848, P<0.01), a highly positive correlation between SOD activity and drought resistance (r = 0.777, P<0.01) was observed. Free proline contents in leaves was not related obviously to the sweet potato drought resistance under 25% PEG treatment. The stronger the drought resistance of variety, the less decrease of RWC and increase of MDA contents, the more increase of SOD activity. By determining these physiological indices in sweet potato leaves under 25% PEG treatment, rapid identification of drought resistant ability of different varietiescan be obtained in the lab.

  2. Nitrogen Use Efficiency of taro and sweet potato in the humid lowlands of Papua New Guinea

    NARCIS (Netherlands)

    Hartemink, A.E.; Johnston, M.; O'Sullivan, J.N.; Poloma, S.

    2000-01-01

    Root crops are an important staple food in the Pacific region. Yields are generally low and inorganic fertilizers are deemed an option to increase root crop production. The effects of inorganic N fertilizers on upland taro (Colocasia esculenta (L.) Schott) and sweet potato (Ipomoea batatas (L.) Lam.

  3. Physicochemical properties of sweet potato starches and their application in noodle products

    NARCIS (Netherlands)

    Chen Zenghong,

    2003-01-01

    Starches isolated from 3 Chinese sweet potato varieties (XuShu18, SuShu2, and SuShu8) differed in granule size and particle size distribution as well as in protein, lipid and phosphorus contents but theamylosecontents were similar for these starches (19.3-20.0%). The pastin

  4. Is the begomovirus, sweet potato leaf curl virus, really seed transmitted in sweetpotato?

    Science.gov (United States)

    Sweetpotato is one of the major root crops in the world and is also widely grown in the southern United States. Sweet potato leaf curl virus (SPLCV) is a begomovirus posing a serious threat to sweetpotato production worldwide and is primarily transmitted by whitefly (Bemisia tabaci) or through veget...

  5. Quality evaluation of functional chicken nuggets incorporated with ground carrot and mashed sweet potato.

    Science.gov (United States)

    Bhosale, S S; Biswas, A K; Sahoo, J; Chatli, M K; Sharma, D K; Sikka, S S

    2011-06-01

    This study was envisaged to evaluate the effect of ground raw carrot (0%, 5%, 10% and 15%) and mashed sweet potato (0%, 5%, 10% and 15%) as functional ingredients on the quality of chicken meat nuggets. The products were evaluated for physicochemical quality, proximate composition, nutritive value, sensory quality as well as color and texture profile analyses. Additions of either raw carrot or mashed sweet potato represent an improvement in the nutritional value and have some beneficial effects due to the presence of dietary fibers and β-carotene. They were also found to be effective in sustaining the desired cooking yield and emulsion stability. Treated samples showed lower (p > 0.05) protein, fat and ash contents but higher (p < 0.05) moisture content than control. There were differences among the nugget samples with respect to sensory qualities, and control samples as well as samples with 10% added carrot/sweet potato had higher overall acceptability scores. Hunter color values (L*, a* and b* values) were higher (p < 0.05) for both the formulated products, while their textural parameters were nearly unchanged. In conclusion, carrot and sweet potato at 10% added level have greater potential as good source of dietary fibers and β-carotene and may find their way in meat industry.

  6. Intersterility, morphology and taxonomy of Ceratocystis fimbriata on sweet potato, cacao and sycamore.

    Science.gov (United States)

    Engelbrecht, Christine J Baker; Harrington, Thomas C

    2005-01-01

    Ceratocystis fimbriata is a large, diverse complex of species that cause wilt-type diseases of many economically important plants. Previous studies have shown that isolates in three monophyletic lineages within the Latin American clade of C. fimbriata are host-specialized to cacao (Theobroma cacao), sweet potato (Ipomoea batatas) and sycamore (Platanus spp.), respectively. We paired testers of opposite mating type from isolates of these lineages to find intersterility groups. Two intersterility groups corresponded to the sweet potato and sycamore lineages, respectively. The cacao lineage contained two intersterility groups, corresponding to two genetic sublineages centered in western Ecuador and Brazil/Costa Rica/Colombia. Six isolates from cacao that were not members of the cacao lineage and were not pathogenic to cacao in an earlier study also were intersterile with members of the two cacao intersterility groups. Some pairings between testers from different lineages or sublineages yielded perithecia from which a few abnormal progeny could be recovered, typical of interspecific hybrids. These progeny showed abnormal segregation of the MAT-2 gene and mycelial morphology, showing that they were indeed the result of crosses. Isolates of the sweet potato, cacao, and sycamore lineages were indistinguishable morphologically except for the presence or absence of a doliform (barrel-shaped) conidial state and minor differences in size of perithecial bases and necks and ascospores. C. fimbriata originally was described from sweet potato. We describe the cacao pathogen as a new species, Ceratocystis cacaofunesta and we raise the sycamore pathogen from a form to species Ceratocystis platani.

  7. Whitefly transmission of Sweet potato leaf curl virus in sweetpotato germplasm

    Science.gov (United States)

    Sweetpotato, Ipomoea batatas (L.) Lam., is among an extensive number of plant species attacked by Bemisia tabaci (Gennadius). Because this important world food crop is vegetatively propagated, it can conveniently accumulate infections by several viruses. Sweet potato leaf curl virus (SPLCV) (ssDNA...

  8. Insecticidal Activity of Some Reducing Sugars Against the Sweet Potato Whitefly, Bemisia tabaci, Biotype B

    Science.gov (United States)

    The effects of 15 sugars on sweet potato whitefly (Bemisia tabaci) survival were determined using bioassays. Arabinose, mannose, ribose and xylose were strongly inhibitory to both nymphal and adult survival. When 10% mannose was added to the diet, 10.5%, 1.0% and 0% of nymphs developed to the 2nd, ...

  9. Physiological responses of sweet potato (Ipomoea batatas L. plants due to different copper concentrations

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    Cristina Copstein Cuchiara

    2015-12-01

    Full Text Available At low concentrations, Cu is considered as an essential micronutrient for plants and as a constituent and activator of several enzymes. However, when in excess, Cu can negatively affect plant growth and metabolism. Therefore, the aim of this study was to evaluate physiological responses of sweet potato plants at different Cu concentrations by measuring morphological parameters, antioxidant metabolism, stomatal characteristics, and mineral profile. For this purpose, sweet potato plants were grown hydroponically in complete nutrient solution for six days. Then, the plants were transferred to solutions containing different Cu concentrations, 0.041 (control, 0.082, and 0.164 mM, and maintained for nine days. The main effect of increased Cu concentration was observed in the roots. The sweet potato plants grown in 0.082 mM Cu solution showed increased activity of antioxidant enzymes and no changes in growth parameters. However, at a concentration of 0.164 mM, Cu was transported from the roots to the shoots. This concentration altered morpho-anatomical characteristics and activated the antioxidant system because of the stress generated by excess Cu. On the basis of the results, it can be concluded that the sweet potato plants were able to tolerate Cu toxicity until 0.082 mM.

  10. Evaluation of Animal Dungs and Organomineral Fertilizer for the Control of Meloidogyne incognita on Sweet Potato

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    Oluremi Solomon Osunlola

    2015-01-01

    Full Text Available Root-knot nematode, Meloidogyne incognita, is an important animate pathogen causing major damage and severe reductions in the growth, yield, and quality of sweet potato. Nematicides are expensive and their application also causes environmental pollution. A field experiment was therefore conducted to evaluate the effectiveness of poultry dung (10 or 20 t/ha, cow dung (10 or 20 t/ha, horse dung (10 or 20 t/ha, goat dung (10 or 20 t/ha, organomineral fertilizer (2 or 4 t/ha, and carbofuran (3 kg a.i/ha in the management of M. incognita on sweet potato using a randomized complete block design. The unamended plots served as control. Data were analysed using ANOVA (p≤0.05. All organic materials and carbofuran significantly (p≤0.05 reduced nematode reproduction and root damage compared with control. Poultry dung (10 and 20 t/ha and carbofuran were, however, more efficient in nematode control than other organic materials. Sweet potato plants that were grown on soil treated with organomineral fertilizer had the highest mean number of vines and fresh shoot weight, while poultry dung improved sweet potato quality and yield. It is therefore recommended that the use of poultry dung be employed in combination with other nematode control strategies to achieve sustainable, economic, and environment-friendly nematode management.

  11. Characterization of silage made from sweet potato vines using corn meal as additive

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    A. A. Corrêa

    2016-12-01

    Full Text Available The objective of this study was to investigate the fermentative and nutritional characteristics of sweet potato (Ipomoea batatas vine silage using different levels of corn meal as additive. A completely randomized design consisting of seven levels of the additive (0, 5, 10, 15, 20, 25 and 30% corn meal and four replicates was used, totaling 28 laboratory mini-silos (experimental units. The different levels of additive in sweet potato vine silage exerted quadratic effects on the content of dry matter (DM, crude protein (CP, neutral detergent insoluble protein (NDIP, acid detergent insoluble protein (ADIP, and total carbohydrates. There was an increase in DM content with inclusion of the additive and CP was reduced from 11.23% (no additive to 9.46% (30% additive in sweet potato vine silage. NDIP and ADIP content was lower in sweet potato vine silage containing 30% additive (1.15% and 0.70%, respectively. No significant differences in organic matter, ashes, ether extract, neutral detergent fiber, acid detergent fiber, or total digestible nutrients were observed between the different levels of additive. Regarding fermentative parameters, a quadratic effect of sweet potato vine silage containing different additive levels was observed on pH, ammoniacal nitrogen as a percentage of total nitrogen [N-NH3 (%NT], and losses from gases and effluent. A lower pH was observed at a level of the additive of 15% (3.31 and higher values at levels of 20%, 25% and 30% (3.88, 3.89 and 3.88, respectively. The  N-NH3 values (%NT ranged from 2.84% (no additive to 3.59% (15% additive, and the lowest loss from gases and effluents was 2.38% DM and 199 kg/t in sweet potato vine silages containing 30% and 10% additive, respectively. Sweet potato vine is a good-quality roughage alternative that can be stored as silage, as along as a water-absorbing additive such as corn meal is used at a level no less than 20%.

  12. Glucose Content and In Vitro Bioaccessibility in Sweet Potato and Winter Squash Varieties during Storage

    Science.gov (United States)

    Zaccari, Fernanda; Cabrera, María Cristina; Saadoun, Ali

    2017-01-01

    Glucose content and in vitro bioaccessibility were determined in raw and cooked pulp of Arapey, Cuabé, and Beauregard sweet potato varieties, as well as Maravilla del Mercado and Atlas winter squash, after zero, two, four, and six months of storage (14 °C, 80% relative humidity (RH)). The total glucose content in 100 g of raw pulp was, for Arapey, 17.7 g; Beauregard, 13.2 g; Cuabé, 12.6 g; Atlas, 4.0 g; and in Maravilla del Mercado, 4.1 g. These contents were reduced by cooking process and storage time, 1.1 to 1.5 times, respectively, depending on the sweet potato variety. In winter squash varieties, the total glucose content was not modified by cooking, while the storage increased glucose content 2.8 times in the second month. After in vitro digestion, the glucose content released was 7.0 times higher in sweet potato (6.4 g) than in winter squash (0.91 g) varieties. Glucose released by in vitro digestion for sweet potato stored for six months did not change, but in winter squashes, stored Atlas released glucose content increased 1.6 times. In conclusion, in sweet potato and winter squash, the glucose content and the released glucose during digestive simulation depends on the variety and the storage time. These factors strongly affect the supply of glucose for human nutrition and should be taken into account for adjusting a diet according to consumer needs. PMID:28665302

  13. Arbuscular mycorrhiza Symbiosis Induces a Major Transcriptional Reprogramming of the Potato SWEET Sugar Transporter Family.

    Science.gov (United States)

    Manck-Götzenberger, Jasmin; Requena, Natalia

    2016-01-01

    Biotrophic microbes feeding on plants must obtain carbon from their hosts without killing the cells. The symbiotic Arbuscular mycorrhizal (AM) fungi colonizing plant roots do so by inducing major transcriptional changes in the host that ultimately also reprogram the whole carbon partitioning of the plant. AM fungi obtain carbohydrates from the root cortex apoplast, in particular from the periarbuscular space that surrounds arbuscules. However, the mechanisms by which cortical cells export sugars into the apoplast for fungal nutrition are unknown. Recently a novel type of sugar transporter, the SWEET, able to perform not only uptake but also efflux from cells was identified. Plant SWEETs have been shown to be involved in the feeding of pathogenic microbes and are, therefore, good candidates to play a similar role in symbiotic associations. Here we have carried out the first phylogenetic and expression analyses of the potato SWEET family and investigated its role during mycorrhiza symbiosis. The potato genome contains 35 SWEETs that cluster into the same four clades defined in Arabidopsis. Colonization of potato roots by the AM fungus Rhizophagus irregularis imposes major transcriptional rewiring of the SWEET family involving, only in roots, changes in 22 of the 35 members. None of the SWEETs showed mycorrhiza-exclusive induction and most of the 12 induced genes belong to the putative hexose transporters of clade I and II, while only two are putative sucrose transporters from clade III. In contrast, most of the repressed transcripts (10) corresponded to clade III SWEETs. Promoter-reporter assays for three of the induced genes, each from one cluster, showed re-localization of expression to arbuscule-containing cells, supporting a role for SWEETs in the supply of sugars at biotrophic interfaces. The complex transcriptional regulation of SWEETs in roots in response to AM fungal colonization supports a model in which symplastic sucrose in cortical cells could be cleaved

  14. Arbuscular mycorrhiza symbiosis induces a major transcriptional reprogramming of the potato SWEET sugar transporter family

    Directory of Open Access Journals (Sweden)

    Jasmin eManck-Götzenberger

    2016-04-01

    Full Text Available Biotrophic microbes feeding on plants must obtain carbon from their hosts without killing the cells. The symbiotic arbuscular mycorrhizal (AM fungi colonizing plant roots do so by inducing major transcriptional changes in the host that ultimately also reprogram the whole carbon partitioning of the plant. AM fungi obtain carbohydrates from the root cortex apoplast, in particular from the periarbuscular space that surrounds arbuscules. However, the mechanisms by which cortical cells export sugars into the apoplast for fungal nutrition are unknown. Recently a novel type of sugar transporter, the SWEET, able to perform not only uptake but also efflux from cells was identified. Plant SWEETs have been shown to be involved in the feeding of pathogenic microbes and are, therefore, good candidates to play a similar role in symbiotic associations. Here we have carried out the first phylogenetic and expression analyses of the potato SWEET family and investigated its role during mycorrhiza symbiosis. The potato genome contains 35 SWEETs that cluster into the same four clades defined in Arabidopsis. Colonization of potato roots by the AM fungus Rhizophagus irregularis imposes major transcriptional rewiring of the SWEET family involving, only in roots, changes in 22 of the 35 members. None of the SWEETs showed mycorrhiza-exclusive induction and most of the twelve induced genes belong to the putative hexose transporters of clade I and II, while only two are putative sucrose transporters from clade III. In contrast, most of the repressed transcripts (10 corresponded to clade III SWEETs. Promoter-reporter assays for three of the induced genes, each from one cluster, showed re-localization of expression to arbuscule-containing cells, supporting a role for SWEETs in the supply of sugars at biotrophic interfaces. The complex transcriptional regulation of SWEETs in roots in response to AM fungal colonization supports a model in which symplastic sucrose in cortical

  15. Color of single-screw extruded blends of soy-sweet potato flour --a response surface analysis.

    Science.gov (United States)

    Iwe, M O; van Zuilichem, D J; Ngoddy, P O

    2000-01-01

    Blends of defatted soy flour and sweet potato flour were extruded in a single-screw extruder run at varying pre-set rotational speeds. Die diameter of the extruder was also varied. A central composite, rotatable nearly orthogonal response surface design was used in studying the interactive effects of extrusion variables on color of the extrudates. Color of raw and processed samples was determined on a DRLANGE Tricolor LFM3 instrument. Measurements were made in duplicates to obtain the CIELAB L*a*b* values. Results showed that whiteness (L*) decreased with increase in sweet potato in the blends during extrusion. Reduction in whiteness (darkening) evidenced in decreased L* values of samples was only affected by increase in sweet potatoes in the blends. Redness (a*) significantly increased as sweet potatoes content increased, which confirmed the decrease in whiteness. Yellowness (b*) also increased considerably, but as a result of the die diameter.

  16. Novel value-added uses for sweet potato juice and flour in polyphenol- and protein-enriched functional food ingredients

    Science.gov (United States)

    Blackcurrant, blueberry, and muscadine grape juices were efficiently sorbed, concentrated, and stabilized into dry granular ingredient matrices which combined anti-inflammatory and antioxidant fruit polyphenols with sweet potato functional constituents (carotenoids, vitamins, polyphenols, fibers). T...

  17. Expressed nifH Genes of Endophytic Bacteria Detected in Field-Grown Sweet Potatoes (Ipomoea batatas L.).

    Science.gov (United States)

    Terakado-Tonooka, Junko; Ohwaki, Yoshinari; Yamakawa, Hiromoto; Tanaka, Fukuyo; Yoneyama, Tadakatsu; Fujihara, Shinsuke

    2008-01-01

    We examined the nitrogenase reductase (nifH) genes of endophytic diazotrophic bacteria expressed in field-grown sweet potatoes (Ipomoea batatas L.) by reverse transcription (RT)-PCR. Gene fragments corresponding to nifH were amplified from mRNA obtained from the stems and storage roots of field-grown sweet potatoes several months after planting. Sequence analysis revealed that these clones were homologous to the nifH sequences of Bradyrhizobium, Pelomonas, and Bacillus sp. in the DNA database. Investigation of the nifH genes amplified from the genomic DNA extracted from these sweet potatoes also showed high similarity to various α-proteobacteria including Bradyrhizobium, β-proteobacteria, and cyanobacteria. These results suggest that bradyrhizobia colonize and express nifH genes not only in the root nodules of leguminous plants but also in sweet potatoes as diazotrophic endophytes.

  18. Type utilization of baked-smashed sweet potato and vegetables on patisserie product

    Science.gov (United States)

    Ana; Subekti, S.; Sudewi; Perdani, E. N.; Hanum, F.; Suciani, T.; Tania, V.

    2016-04-01

    The research was an experimental study in Green Skill Patisserie Course using Project-Based Learning model. It aims to complete the project development of pie named guramnis rainbow pie. Several experiments were carried out to produce a pie dough crust mixed with baked-smashed sweet potato and added with vegetables extract as the food coloring. The experiment method in order to make a better appearance or an attractive shape and to have more nutrition. In addition, the pie was filled with a mixture of sweet and sour gurame as Indonesian traditional food. By applying an organoleptic test to 10 respondents, the result shows that pie dough recipe using flour substituted by baked-smashed sweet potato with 2:1 of a ratio. Coloring pie dough adding extract vegetables (carrots, beets and celery) as color. We found that pie dough has more interesting pie color (90%) and the texture of the pie with a quite level of crispness (60%). Moreover, the pie taste is fairly (70%) and tasty (70%). Nutritional analysis results show that per size, serving guramnis rainbow pie contains energy as much as 81.72 calories, carbohydrates 12.5 grams, fat 2.32 grams and 2.77 grams of protein. The main findings are the pie appearance and taste was different compared to the previous pies because of the pie was served with gurame asam manis as the filling and had flour and cilembu sweet potato as the basic ingredients. The color of guramnis rainbow pie was resulted not only from food coloring but also from vegetables extract namely carrot (orange), bit (red), and salary (green). Thus, it had many benefits for health and adds the nutrition. The researchers recommend a further study in order to make pie dough with baked sweet potato and vegetables extract having an optimal level of crispness.

  19. Effect of Soybean Flour on Physico-chemical, Functional, and Rheological Properties of Composite Flour from Rice, Sweet Potato, and Potato

    OpenAIRE

    Julianti, Elisa; Rusmarilin, Herla; Ridwansyah,; Yusraini, Era

    2016-01-01

    Three composite flours were prepared by combining rice flour, potato starch, sweet potato flour, soybean flour, and xanthan gum in the ratio of 30: 15: 50: 4.5: 0.5; 30: 15: 45: 9.5: 0.5; and 30: 15: 40: 14.5: 0.5, were analysed for selected physical, chemical, functional, and rheological properties. Fat, protein, ash, and crude fibre content were found to increase with increase in the ratio of soybean flour and decrease in the ratio of sweet potato flour in the mixture. The composite flours ...

  20. Studies on sweet potatoes. Pt. 2. Isolation and characterization of starch

    Energy Technology Data Exchange (ETDEWEB)

    Madhusudhan, B.; Susheelamma, N.S.; Tharanathan, R.N. (Central Food Technological Research Inst., Mysore (India). Dept. of Food Chemistry)

    1993-01-01

    By differntial sedimentation and centrifugation steps four starch isolates were recovered from sun dried sweet potato flour. The granules in these isolates were of different size, shape and population characteristics, and were anionic in nature. They showed a single stage swelling with 30 to 35% solubility in water and only [proportional to]30% solubility in DMSO even after 72 h. Their starch content varied from [proportional to]48 to 88%. The presence of thermostable amylases in sweet potato resulted in considerable decrease in Brabender viscosity values as amylographic studies in the presence of HgCl[sub 2] showed significant increase in peak (PV) and setback (SBV) viscosities. The starch isolate I had 25% higher PV as compared to the isolate II but retrogradation was much low in this. Susceptibility to glucoamylase digestion showed a decreasing trend from the isolate I to the IV on solid basis, but comparable on starch basis. (orig.).

  1. Use of slow-release fertilizer on the production of sweet potatoes plantlets in tray

    Directory of Open Access Journals (Sweden)

    Amarílis Beraldo Rós

    2013-12-01

    Full Text Available The production of plantlets in containers generally requires the use of fertilizers. The aim of this study was to evaluate the production of sweet potato in styrofoam trays using slow-release fertilizer. The experiment was carried out, under a screen-protected nursery, in a factorial scheme 5x5, with five doses of slow-release fertilizer NPK 19-06-10 (0, 50, 100, 150 e 200 g per 25 kg de substrate and five times of plantlets permanence in tray (14, 28, 42, 56 and 70 days after planting the cuttings. The number and dry matter of roots and leaves were evaluated. The number of roots was not influenced by fertilizer addition. In general, there is not damage to plantlets growth until the highest dose used. Therefore, the fertilizer addition increases the sweet potato plants growth and the dose of 200 g per 25 kg of substrate is responsible for the best results.

  2. Effect of Hydroxypropylation on Functional Properties of Different Cultivars of Sweet Potato Starch in Sri Lanka

    Science.gov (United States)

    Senanayake, Suraji; Gunaratne, Anil; Ranaweera, K. K. D. S.; Bamunuarachchi, Arthur

    2014-01-01

    Starches obtained from different cultivars of sweet potatoes commonly consumed in Sri Lanka, were chemically modified with hydroxypropyl substitution, to analyze the changes in the physicochemical properties. Significant changes (P gelatinization and retrogradation enthalpies as well as gelatinization temperature were observed for derivatized starches compared to the native starch. Low levels of pasting stability with increased levels of breakdown and reduced cold paste viscosity were observed in the hydroxypropylated starch samples except for the Malaysian cultivar (S5). Chemically modified starch gels stored under cold storage did not show a syneresis for two weeks in the cycle and the frozen storage showed much improved stability in the starch gels within the four-week cycle. Chemical modification of sweet potato starch with hydroxyl propyl substitution can enhance the functional characteristics of the native starch which will improve its potential application in the food industry. PMID:26904619

  3. Statistical optimization of process parameters for exopolysaccharide production by Aureobasidium pullulans using sweet potato based medium

    OpenAIRE

    Padmanaban, Sethuraman; Balaji, Nagarajan; Muthukumaran, Chandrasekaran; Tamilarasan, Krishnamurthi

    2015-01-01

    Statistical experimental designs were applied to optimize the fermentation medium for exopolysaccharide (EPS) production. Plackett–Burman design was applied to identify the significance of seven medium variables, in which sweet potato and yeast extract were found to be the significant variables for EPS production. Central composite design was applied to evaluate the optimum condition of the selected variables. Maximum EPS production of 9.3 g/L was obtained with the predicted optimal level of ...

  4. Quality evaluation of yoghurt stabilized with sweet potato (Ipomoea batatas) and taro (Colocassia esculenta) starch

    OpenAIRE

    Aysha Sameen; Muhammad Issa Khan; Muhammad Umair Sattar; Asma Javid; Aimen Ayub

    2016-01-01

    Stabilizers are important component in manufactured products such as yoghurt. The addition of stabilizers improves body, texture, appearance, mouth feel and prevents technical defects such as synersis in yoghurts. In this study starch was extracted from plant sources (sweet potato, taro) with and without use of chemicals. Yoghurt was enriched with different levels of extracted starch. Yoghurt samples were analyzed for physicochemical and functional attributes such as pH, acidity, synersis, wa...

  5. Starch digestibility and predicted glycemic index of fried sweet potato cultivars

    Directory of Open Access Journals (Sweden)

    Amaka Odenigbo

    2012-07-01

    Full Text Available Background: Sweet potato (Ipomoea batatas L. is a very rich source of starch. There is increased interest in starch digestibility and the prevention and management of metabolic diseases.Objective: The aim of this study was to evaluate the levels of starch fractions and predicted glycemic index of different cultivars of sweet potato. Material and Method: French fries produced from five cultivars of sweet potato (‘Ginseng Red’, ‘Beauregard’, ‘White Travis’, ‘Georgia Jet clone #2010’ and ‘Georgia Jet’ were used. The level of total starch (TS, resistant starch (RS, digestible starch (DS, and starch digestion index starch digestion index in the samples were evaluated. In vitro starch hydrolysis at 30, 90, and 120 min were determined enzymatically for calculation of rapidly digestible starch (RDS, predicted glycemic index (pGI and slowly digestible starch (SDS respectively. Results: The RS content in all samples had an inversely significant correlation with pGI (-0.52; P<0.05 while RDS had positive and significant influence on both pGI (r=0.55; P<0.05 and SDI (r= 0.94; P<0.01. ‘White Travis’ and ‘Ginseng Red’ had higher levels of beneficial starch fractions (RS and SDS with low pGI and starch digestion Index (SDI, despite their higher TS content. Generally, all the cultivars had products with low to moderate GI values. Conclusion: The glycemic index of these food products highlights the health promoting characteristics of sweet potato cultivars.

  6. Iron Bioavailability and Provitamin A from Sweet Potato- and Cereal-Based Complementary Foods

    Science.gov (United States)

    Christides, Tatiana; Amagloh, Francis Kweku; Coad, Jane

    2015-01-01

    Iron and vitamin A deficiencies in childhood are public health problems in the developing world. Introduction of cereal-based complementary foods, that are often poor sources of both vitamin A and bioavailable iron, increases the risk of deficiency in young children. Alternative foods with higher levels of vitamin A and bioavailable iron could help alleviate these micronutrient deficiencies. The objective of this study was to compare iron bioavailability of β-carotene-rich sweet potato-based complementary foods (orange-flesh based sweet potato (OFSP) ComFa and cream-flesh sweet potato based (CFSP) ComFa with a household cereal-based complementary food (Weanimix) and a commercial cereal (Cerelac®), using the in vitro digestion/Caco-2 cell model. Iron bioavailability relative to total iron, concentrations of iron-uptake inhibitors (fibre, phytates, and polyphenols), and enhancers (ascorbic acid, ß-carotene and fructose) was also evaluated. All foods contained similar amounts of iron, but bioavailability varied: Cerelac® had the highest, followed by OFSP ComFa and Weanimix, which had equivalent bioavailable iron; CFSP ComFa had the lowest bioavailability. The high iron bioavailability from Cerelac® was associated with the highest levels of ascorbic acid, and the lowest levels of inhibitors; polyphenols appeared to limit sweet potato-based food iron bioavailability. Taken together, the results do not support that CFSP- and OFSP ComFa are better sources of bioavailable iron compared with non-commercial/household cereal-based weaning foods; however, they may be a good source of provitamin A in the form of β-carotene.

  7. Iron Bioavailability and Provitamin A from Sweet Potato- and Cereal-Based Complementary Foods

    Directory of Open Access Journals (Sweden)

    Tatiana Christides

    2015-09-01

    Full Text Available Iron and vitamin A deficiencies in childhood are public health problems in the developing world. Introduction of cereal-based complementary foods, that are often poor sources of both vitamin A and bioavailable iron, increases the risk of deficiency in young children. Alternative foods with higher levels of vitamin A and bioavailable iron could help alleviate these micronutrient deficiencies. The objective of this study was to compare iron bioavailability of β-carotene-rich sweet potato-based complementary foods (orange-flesh based sweet potato (OFSP ComFa and cream-flesh sweet potato based (CFSP ComFa with a household cereal-based complementary food (Weanimix and a commercial cereal (Cerelac®, using the in vitro digestion/Caco-2 cell model. Iron bioavailability relative to total iron, concentrations of iron-uptake inhibitors (fibre, phytates, and polyphenols, and enhancers (ascorbic acid, ß-carotene and fructose was also evaluated. All foods contained similar amounts of iron, but bioavailability varied: Cerelac® had the highest, followed by OFSP ComFa and Weanimix, which had equivalent bioavailable iron; CFSP ComFa had the lowest bioavailability. The high iron bioavailability from Cerelac® was associated with the highest levels of ascorbic acid, and the lowest levels of inhibitors; polyphenols appeared to limit sweet potato-based food iron bioavailability. Taken together, the results do not support that CFSP- and OFSP ComFa are better sources of bioavailable iron compared with non-commercial/household cereal-based weaning foods; however, they may be a good source of provitamin A in the form of β-carotene.

  8. Iron Bioavailability and Provitamin A from Sweet Potato- and Cereal-Based Complementary Foods

    OpenAIRE

    Tatiana Christides; Francis Kweku Amagloh; Jane Coad

    2015-01-01

    Iron and vitamin A deficiencies in childhood are public health problems in the developing world. Introduction of cereal-based complementary foods, that are often poor sources of both vitamin A and bioavailable iron, increases the risk of deficiency in young children. Alternative foods with higher levels of vitamin A and bioavailable iron could help alleviate these micronutrient deficiencies. The objective of this study was to compare iron bioavailability of β-carotene-rich sweet potato-based ...

  9. Effects of drying on caffeoylquinic acid derivative content and antioxidant capacity of sweet potato leaves

    Directory of Open Access Journals (Sweden)

    Toong Long Jeng

    2015-12-01

    Full Text Available Caffeoylquinic acid (CQA derivatives are known to possess antioxidative potential and have many beneficial effects on human health. The present study compared the CQA contents and antioxidant activities of aerial parts of sweet potato plants. The effects of drying methods (freeze drying, and drying at 30°C, 70°C, and 100°C on these two parameters of the first fully expanded leaves were also assessed. The results indicated that the CQA derivatives were detectable in leaves, stem, and flowers of sweet potato plants (varied from 39.34 mg/g dry weight to 154.05 mg/g dry weight, with the leaves (particularly expanding and first fully expanded leaves containing more CQA derivatives than other aerial plant parts. The expanding and first fully expanded leaves also exhibited greater antioxidant activities than other aerial plant parts, possibly due to their higher contents of CQA derivatives. Drying method significantly affected the content of CQA derivatives in dried sweet potato leaf tissues. Drying treatments at both 70°C and 100°C significantly reduced the CQA derivative content and antioxidant activity in the first fully expanded leaves. Among the tested drying methods, the freeze-drying method demonstrated the preservation of the highest amount of CQA derivatives (147.84 mg/g and antioxidant property. However, 30°C cool air drying was also a desirable choice (total CQA derivative content was reduced to only 129.52 mg/g, compared to 70°C and 100°C hot air drying, for commercial-scale processing of sweet potato leaves, if the higher operation cost of freeze drying was a major concern.

  10. Studies on sweet potatoes. Pt. 1. Changes in the carbohydrates during processing

    Energy Technology Data Exchange (ETDEWEB)

    Susheelamma, N.S.; Changala Reddy, G.; Rukmani, C.S.; Tharanathan, R.N. (Central Food Technological Research Inst., Mysore (India). Dept. of Food Chemistry)

    1992-05-01

    The qualitative and quantitative changes in the nature of different carbohydrate fractions of sweet potatoes (hard and soft cooking types), after dry (baking and toasting) and wet (steaming) processing have been studied. Maltose, glucose and fructose were the predominant sugars in the ethanol soluble fraction. The total sugar and amylose contents significantly decreased in the ethanol insoluble residues. This was supported by the decrease in blue value and the absorption maxima of the iodine complex. (orig.).

  11. Evaluation of starch noodles made from three typical Chinese sweet-potato starches

    NARCIS (Netherlands)

    Chen, Z.; Sagis, L.M.C.; Legger, A.; Linssen, J.P.H.; Schols, H.A.; Voragen, A.G.J.

    2002-01-01

    The physical properties of starches from 3 typical Chinese sweet potato varieties (SuShu2, SuShu8, and XuShu18) were studied in relation to their noodle-making performance. The starch gel properties of SuShu2 differed from those of SuShu8 and XuShu18. As determined by both instrumental and sensory a

  12. Analyses of the complete genome and gene expression of chloroplast of sweet potato [Ipomoea batata].

    Science.gov (United States)

    Yan, Lang; Lai, Xianjun; Li, Xuedan; Wei, Changhe; Tan, Xuemei; Zhang, Yizheng

    2015-01-01

    Sweet potato [Ipomoea batatas (L.) Lam] ranks among the top seven most important food crops cultivated worldwide and is hexaploid plant (2n=6x=90) in the Convolvulaceae family with a genome size between 2,200 to 3,000 Mb. The genomic resources for this crop are deficient due to its complicated genetic structure. Here, we report the complete nucleotide sequence of the chloroplast (cp) genome of sweet potato, which is a circular molecule of 161,303 bp in the typical quadripartite structure with large (LSC) and small (SSC) single-copy regions separated by a pair of inverted repeats (IRs). The chloroplast DNA contains a total of 145 genes, including 94 protein-encoding genes of which there are 72 single-copy and 11 double-copy genes. The organization and structure of the chloroplast genome (gene content and order, IR expansion/contraction, random repeating sequences, structural rearrangement) of sweet potato were compared with those of Ipomoea (L.) species and some basal important angiosperms, respectively. Some boundary gene-flow and gene gain-and-loss events were identified at intra- and inter-species levels. In addition, by comparing with the transcriptome sequences of sweet potato, the RNA editing events and differential expressions of the chloroplast functional-genes were detected. Moreover, phylogenetic analysis was conducted based on 77 protein-coding genes from 33 taxa and the result may contribute to a better understanding of the evolution progress of the genus Ipomoea (L.), including phylogenetic relationships, intraspecific differentiation and interspecific introgression.

  13. Anthocyanins and flavonols are responsible for purple color of Lablab purpureus (L.) sweet pods.

    Science.gov (United States)

    Cui, Baolu; Hu, Zongli; Zhang, Yanjie; Hu, Jingtao; Yin, Wencheng; Feng, Ye; Xie, Qiaoli; Chen, Guoping

    2016-06-01

    Lablab pods, as dietary vegetable, have high nutritional values similar to most of edible legumes. Moreover, our studies confirmed that purple lablab pods contain the natural pigments of anthocyanins and flavonols. Compared to green pods, five kinds of anthocyanins (malvidin, delphinidin and petunidin derivatives) were found in purple pods by HPLC-ESI-MS/MS and the major contents were delphinidin derivatives. Besides, nine kinds of polyphenol derivatives (quercetin, myricetin, kaempferol and apigenin derivatives) were detected by UPLC-ESI-MS/MS and the major components were quercetin and myricetin derivatives. In order to discover their molecular mechanism, expression patterns of biosynthesis and regulatory gens of anthocyanins and flavonols were investigated. Experimental results showed that LpPAL, LpF3H, LpF3'H, LpDFR, LpANS and LpPAP1 expressions were significantly induced in purple pods compared to green ones. Meanwhile, transcripts of LpFLS were more abundant in purple pods than green or yellow ones, suggestind that co-pigments of anthocyanins and flavonols are accumulated in purple pods. Under continuously dark condition, no anthocyanin accumulation was detected in purple pods and transcripts of LpCHS, LpANS, LpFLS and LpPAP1 were remarkably repressed, indicating that anthocyanins and flavonols biosynthesis in purple pods was regulated in light-dependent manner. These results indicate that co-pigments of anthocyanins and flavonols contribute to purple pigmentations of pods.

  14. Sugar Profile, Mineral Content, and Rheological and Thermal Properties of an Isomerized Sweet Potato Starch Syrup.

    Science.gov (United States)

    Dominque, Brunson; Gichuhi, Peter N; Rangari, Vijay; Bovell-Benjamin, Adelia C

    2013-01-01

    Currently, corn is used to produce more than 85% of the world's high fructose syrup (HFS). There is a search for alternative HFS substrates because of increased food demand and shrinking economies, especially in the developing world. The sweet potato is a feasible, alternative raw material. This study isomerized a high glucose sweet potato starch syrup (SPSS) and determined its sugar profile, mineral content, and rheological and thermal properties. Rheological and thermal properties were measured using a rheometer and DSC, respectively. Sweet potato starch was hydrolyzed to syrup with a mean fructose content of 7.6 ± 0.4%. The SPSS had significantly higher (P SPSS acted as a non-Newtonian, shear-thinning liquid in which the viscosity decreased as shear stress increased. Water loss temperature of the SPSS continually decreased during storage, while pancake and ginger syrups' peak water loss temperature decreased initially and then increased. Further and more detailed studies should be designed to further enhance the fructose content of the syrup and observe its stability beyond 70 days. The SPSS has the potential to be used in human food systems in space and on Earth.

  15. Sugar Profile, Mineral Content, and Rheological and Thermal Properties of an Isomerized Sweet Potato Starch Syrup

    Directory of Open Access Journals (Sweden)

    Brunson Dominque

    2013-01-01

    Full Text Available Currently, corn is used to produce more than 85% of the world’s high fructose syrup (HFS. There is a search for alternative HFS substrates because of increased food demand and shrinking economies, especially in the developing world. The sweet potato is a feasible, alternative raw material. This study isomerized a high glucose sweet potato starch syrup (SPSS and determined its sugar profile, mineral content, and rheological and thermal properties. Rheological and thermal properties were measured using a rheometer and DSC, respectively. Sweet potato starch was hydrolyzed to syrup with a mean fructose content of 7.6±0.4%. The SPSS had significantly higher (P<0.05 mineral content when compared to commercial ginger and pancake syrups. During 70 days of storage, the SPSS acted as a non-Newtonian, shear-thinning liquid in which the viscosity decreased as shear stress increased. Water loss temperature of the SPSS continually decreased during storage, while pancake and ginger syrups’ peak water loss temperature decreased initially and then increased. Further and more detailed studies should be designed to further enhance the fructose content of the syrup and observe its stability beyond 70 days. The SPSS has the potential to be used in human food systems in space and on Earth.

  16. Quality evaluation of yoghurt stabilized with sweet potato (Ipomoea batatas and taro (Colocassia esculenta starch

    Directory of Open Access Journals (Sweden)

    Aysha Sameen

    2016-08-01

    Full Text Available Stabilizers are important component in manufactured products such as yoghurt. The addition of stabilizers improves body, texture, appearance, mouth feel and prevents technical defects such as synersis in yoghurts. In this study starch was extracted from plant sources (sweet potato, taro with and without use of chemicals. Yoghurt was enriched with different levels of extracted starch. Yoghurt samples were analyzed for physicochemical and functional attributes such as pH, acidity, synersis, water holding capacity, viscosity, total solids and sensory profile. Use of chemically extracted starches at the level of 0.3-0.4% (Sweet potato and 0.2-0.3% (Taro   in yoghurt manufacturing showed better  results  in  terms  of  lowering synersis, increasing water holding capacity, viscosity and overall acceptability as compared to the yoghurt containing stabilizer i.e. gelatin 0.5% w/w. Use of starches did not significantly affect the sensory attributes. Yoghurt that contains sweet potato and taro starch at 0.5% gave excellent results for water holding capacity, viscosity and for all sensory attributes as compared to gelatin

  17. Effect of citric acid concentration and hydrolysis time on physicochemical properties of sweet potato starches.

    Science.gov (United States)

    Surendra Babu, Ayenampudi; Parimalavalli, Ramanathan; Rudra, Shalini Gaur

    2015-09-01

    Physicochemical properties of citric acid treated sweet potato starches were investigated in the present study. Sweet potato starch was hydrolyzed using citric acid with different concentrations (1 and 5%) and time periods (1 and 11 h) at 45 °C and was denoted as citric acid treated starch (CTS1 to CTS4) based on their experimental conditions. The recovery yield of acid treated starches was above 85%. The CTS4 sample displayed the highest amylose (around 31%) and water holding capacity its melting temperature was 47.66 °C. The digestibility rate was slightly increased for 78.58% for the CTS3 and CTS4. The gel strength of acid modified starches ranged from 0.27 kg to 1.11 kg. RVA results of acid thinned starches confirmed a low viscosity profile. CTS3 starch illustrated lower enthalpy compared to all other modified starches. All starch samples exhibited a shear-thinning behavior. SEM analysis revealed that the extent of visible degradation was increased at higher hydrolysis time and acid concentration. The CTS3 satisfied the criteria required for starch to act as a fat mimetic. Overall results conveyed that the citric acid treatment of sweet potato starch with 5% acid concentration and 11h period was an ideal condition for the preparation of a fat replacer.

  18. Pulsed-electric-field-assisted extraction of anthocyanins from purple-fleshed potato.

    Science.gov (United States)

    Puértolas, Eduardo; Cregenzán, Oliver; Luengo, Elisa; Alvarez, Ignacio; Raso, Javier

    2013-02-15

    The influence of pulsed electric field (PEF) treatment on the anthocyanin extraction yield (AEY) from purple-fleshed potato (PFP) at different extraction times (60-480 min) and temperatures (10-40°C) using water and ethanol (48% and 96%) as solvents has been investigated. Response surface methodology was used to determine optimal PEF treatment and optimise anthocyanin extraction. A PEF treatment of 3.4 kV/cm and 105 μs (35 pulses of 3 μs) resulted in the highest cell disintegration index (Z(p)=1) at the lowest specific energy requirements (8.92 kJ/kg). This PEF treatment increased the AEY, the effect being higher at lower extraction temperature with water as solvent. After 480 min at 40°C, the AEY obtained for the untreated sample using 96% ethanol as the solvent (63.9 mg/100 g fw) was similar to that obtained in the PEF-treated sample using water (65.8 mg/100 g fw). Therefore, PEF was possible with water, a more environmental-friendly solvent than ethanol, without decreasing the AEY from PFP.

  19. Solanum americanum: reservoir for Potato virus Y and Cucumber mosaic virus in sweet pepper crops

    Directory of Open Access Journals (Sweden)

    Monika Fecury Moura

    2014-03-01

    Full Text Available Weeds can act as important reservoirs for viruses. Solanum americanum (Black nightshade is a common weed in Brazil and samples showing mosaic were collected from sweet pepper crops to verify the presence of viruses. One sample showed mixed infection between Cucumber mosaic virus (CMV and Potato virus Y (PVY and one sample showed simple infection by PVY. Both virus species were transmitted by plant extract and caused mosaic in tomato (Solanum lycopersicum cv. Santa Clara, sweet pepper (Capsicum annuum cv. Magda, Nicotiana benthamiana and N. tabaccum TNN, and local lesions on Chenopodium quinoa, C. murale and C. amaranticolor. The coat protein sequences for CMV and PVY found in S. americanum are phylogenetically more related to isolates from tomato. We conclude that S. americanum can act as a reservoir for different viruses during and between sweet pepper crop seasons.

  20. Improved tolerance to various abiotic stresses in transgenic sweet potato (Ipomoea batatas expressing spinach betaine aldehyde dehydrogenase.

    Directory of Open Access Journals (Sweden)

    Weijuan Fan

    Full Text Available Abiotic stresses are critical delimiters for the increased productivity and cultivation expansion of sweet potato (Ipomoea batatas, a root crop with worldwide importance. The increased production of glycine betaine (GB improves plant tolerance to various abiotic stresses without strong phenotypic changes, providing a feasible approach to improve stable yield production under unfavorable conditions. The gene encoding betaine aldehyde dehydrogenase (BADH is involved in the biosynthesis of GB in plants, and the accumulation of GB by the heterologous overexpression of BADH improves abiotic stress tolerance in plants. This study is to improve sweet potato, a GB accumulator, resistant to multiple abiotic stresses by promoted GB biosynthesis. A chloroplastic BADH gene from Spinacia oleracea (SoBADH was introduced into the sweet potato cultivar Sushu-2 via Agrobacterium-mediated transformation. The overexpression of SoBADH in the transgenic sweet potato improved tolerance to various abiotic stresses, including salt, oxidative stress, and low temperature. The increased BADH activity and GB accumulation in the transgenic plant lines under normal and multiple environmental stresses resulted in increased protection against cell damage through the maintenance of cell membrane integrity, stronger photosynthetic activity, reduced reactive oxygen species (ROS production, and induction or activation of ROS scavenging by the increased activity of free radical-scavenging enzymes. The increased proline accumulation and systemic upregulation of many ROS-scavenging genes in stress-treated transgenic plants also indicated that GB accumulation might stimulate the ROS-scavenging system and proline biosynthesis via an integrative mechanism. This study demonstrates that the enhancement of GB biosynthesis in sweet potato is an effective and feasible approach to improve its tolerance to multiple abiotic stresses without causing phenotypic defects. This strategy for trait

  1. Historical collections reveal patterns of diffusion of sweet potato in Oceania obscured by modern plant movements and recombination.

    Science.gov (United States)

    Roullier, Caroline; Benoit, Laure; McKey, Doyle B; Lebot, Vincent

    2013-02-05

    The history of sweet potato in the Pacific has long been an enigma. Archaeological, linguistic, and ethnobotanical data suggest that prehistoric human-mediated dispersal events contributed to the distribution in Oceania of this American domesticate. According to the "tripartite hypothesis," sweet potato was introduced into Oceania from South America in pre-Columbian times and was then later newly introduced, and diffused widely across the Pacific, by Europeans via two historically documented routes from Mexico and the Caribbean. Although sweet potato is the most convincing example of putative pre-Columbian connections between human occupants of Polynesia and South America, the search for genetic evidence of pre-Columbian dispersal of sweet potato into Oceania has been inconclusive. Our study attempts to fill this gap. Using complementary sets of markers (chloroplast and nuclear microsatellites) and both modern and herbarium samples, we test the tripartite hypothesis. Our results provide strong support for prehistoric transfer(s) of sweet potato from South America (Peru-Ecuador region) into Polynesia. Our results also document a temporal shift in the pattern of distribution of genetic variation in sweet potato in Oceania. Later reintroductions, accompanied by recombination between distinct sweet potato gene pools, have reshuffled the crop's initial genetic base, obscuring primary patterns of diffusion and, at the same time, giving rise to an impressive number of local variants. Moreover, our study shows that phenotypes, names, and neutral genes do not necessarily share completely parallel evolutionary histories. Multidisciplinary approaches, thus, appear necessary for accurate reconstruction of the intertwined histories of plants and humans.

  2. Development of a pilot system for converting sweet potato starch into glucose syrup

    Science.gov (United States)

    Silayo, Valerian C K.; Lu, John Y.; Aglan, Heshmat A.; Bovell-Benjamin, A. C. (Principal Investigator)

    2003-01-01

    Sweet potato has been chosen as one of NASA's crops to support human beings in future space missions. One of the possible uses is to make syrup that can be used as a general sweetener. In this work a simple engineering system for converting sweet potato starch into glucose syrup was studied on a laboratory scale. The system comprises the following main units: a blender, continuous stirred tank reactor (CSTR), centrifugal and vacuum filters, deionization column and vacuum evaporator. The system was tested by carrying out conversion processes from fresh sweet potato roots. The roots were pealed, sliced, homogenized, heated and hydrolyzed by diastase of malt and Dextrozyme C (Novo Nordisk BioChem, North America, Inc.) enzymes in the CSTR. After hydrolysis the slurry was filtered, de-ionized and concentrated to get glucose syrup. The performance of the system was evaluated based on the quality of the conversion. The main factor was the level of reducing sugars except for the deionization where ash content and color were the main factors. Through careful control of the system units, good heating performance in the CSTR was obtained and the hydrolysis process attained sufficient conversion. The filtration process that incorporated the centrifuge was faster than when it was by-passed to the vacuum filter but losses in sugars were higher. Deionization removed more than 90% of the ash and reduced pigmentation, with probable insignificant losses in sugars during the deionization process. Recovery levels when the centrifuge was used and when it was by-passed could reach about 65% and 78%, respectively. These correspond to reducing sugar concentration of 259 and 310 mg/ml in 150-ml syrups from 300 g of sweet potatoes in each process. However, from concentration trials, syrups with volumes of 100 and 70 ml with the respective dextrose equivalence of 281 and 213 mg/ml were obtained. The syrups obtained were brownish in color and the process that employed centrifugal filtration

  3. Comparative analysis of phytochemicals and nutrient availability in two contrasting cultivars of sweet potato (Ipomoea batatas L.).

    Science.gov (United States)

    Shekhar, Shubhendu; Mishra, Divya; Buragohain, Alak Kumar; Chakraborty, Subhra; Chakraborty, Niranjan

    2015-04-15

    Sweet potato ranks as the world's seventh most important food crop, and has major contribution to energy and phytochemical source of nutrition. To unravel the molecular basis for differential nutrient availability, and to exploit the natural genetic variation(s) of sweet potato, a series of physiochemical and proteomics experiment was conducted using two contrasting cultivars, an orange-fleshed sweet potato (OFSP) and a white-fleshed sweet potato (WFSP). Phytochemical screening revealed high percentage of carbohydrate, reducing sugar and phenolics in WFSP, whereas OFSP showed increased levels of total protein, flavonoids, anthocyanins, and carotenoids. The rate of starch and cellulose degradation was found to be less in OFSP during storage, indicating tight regulation of gene(s) responsible for starch-degradation. Comparative proteomics displayed a cultivar-dependent expression of proteins along with evolutionarily conserved proteins. These results suggest that cultivar-specific expression of proteins and/or their interacting partners might play a crucial role for nutrient acquisition in sweet potato.

  4. Effects of Moringa oleifera LAM, Leguminous Plants and NPK Fertilizer Comparatively on Orange Fleshed Sweet Potato in Alley Cropping System

    Directory of Open Access Journals (Sweden)

    IN Abdullahi

    2014-09-01

    Full Text Available The research work conducted at the Teaching and Research Farm of University of Abuja was aimed at assessing the effect of Moringa oleifera, selected leguminous plants and inorganic fertilizer on the performance of orange fleshed sweet potato in Alley Cropping System. Randomized Complete Block Design (RCBD using five treatments with three replications was applied. Data collected include: percentage survival of sweet potato, length per vine (cm, number of leaves per vine, leaf area of sweet potato, weed dry matter (g/m2, yield of sweet potato roots. Highest number of leaves (28 per plant was recorded in the control plot while the plots with NPK fertilizer had the highest length per vine (94.55cm though not significantly (p>0.05 different from others. Higher percent survival (88% of sweet potato was recorded from control plots. Stands grown in Arachis hypogeae plots produced the highest leaf area (0.202m2 while plots in which NPK fertilizer was applied experienced highest weed dry matter (4.083g/m2 although highest root yield (1.2t/ha was recorded from the plots with NPK fertilizer. DOI: http://dx.doi.org/10.3126/ije.v3i3.11061 International Journal of Environment Vol.3(3 2014: 24-35

  5. Effect of Soybean Flour on Physico-chemical, Functional, and Rheological Properties of Composite Flour from Rice, Sweet Potato, and Potato.

    Science.gov (United States)

    Julianti, Elisa; Rusmarilin, Herla; Ridwansyah; Yusraini, Era

    2016-11-01

    Three composite flours were prepared by combining rice flour, potato starch, sweet potato flour, soybean flour, and xanthan gum in the ratio of 30: 15: 50: 4.5: 0.5; 30: 15: 45: 9.5: 0.5; and 30: 15: 40: 14.5: 0.5, were analysed for selected physical, chemical, functional, and rheological properties. Fat, protein, ash, and crude fibre content were found to increase with increase in the ratio of soybean flour and decrease in the ratio of sweet potato flour in the mixture. The composite flours were not significantly different in water and oil absorption capacity, swelling power, and baking expansion. There was a tendency for the relative viscosities of the composite flours to increase significantly with increasing proportion of the soybean flour and decreasing proportion of sweet potato flour in the mixture. Pasting viscosity measurements of the composite flours gave maximum (peak) viscosity values ranging from 582.00-668.67 cP. The pasting analysis results indicated increased level of setback and final viscosity, pasting temperature, setback and stability ratio while peak viscosity decreased with increasing proportion of soybean flour and decreasing proportion of sweet potato flour in the mixture.

  6. Arsenic, Pb, Cu, Zn, and P accumulation by sweet potato grown on broiler litter ash amended Pb and As contaminated soils

    Science.gov (United States)

    Sweet potato [Ipomoea batatas (L) Lam] is an important food crop grown in tropical and subtropical areas of the world. It is generally grown for its carbohydrates rich tuber. Sweet potato leaves rich in vitamin B, ß-carotene, iron, calcium, zinc and protein have been used as leafy vegetables in diff...

  7. Relationship Between Changes of Endogenous Hormone in Sweet Potato Under Water Stress and Variety Drought-resistance

    Institute of Scientific and Technical Information of China (English)

    ZHANG Ming-sheng; XIE Bo; TAN Feng

    2002-01-01

    The IAA, GA3, iPA, ZR and ABA contents in sweet potato leaves under drought conditions were determined by the method of ELISA, and the relationship between these endogenous hormones and drought resistance of different sweet potato varieties were studied. The results showed the IAA, GA3, iPA and ZR contents in sweet potato leaves decreased, but ABA contents increased obviously. The stronger the drought resistance of the variety was, the more IAA, GA3, iPA and ZR contents decreased and the less ABA contents increased. Their relative contents correlated significantly negatively(r were - 0.9070, - 0.9493, - 0.9509,- 0.8674 and - 0.9117 respectively) to drought-resistability.

  8. Sweet potato cysteine proteases SPAE and SPCP2 participate in sporamin degradation during storage root sprouting.

    Science.gov (United States)

    Chen, Hsien-Jung; Liang, Shu-Hao; Huang, Guan-Jhong; Lin, Yaw-Huei

    2015-08-15

    Sweet potato sporamins are trypsin inhibitors and exhibit strong resistance to digestion by pepsin, trypsin and chymotrypsin. In addition, they constitute the major storage proteins in the sweet potato and, after degradation, provide nitrogen as a nutrient for seedling regrowth in sprouting storage roots. In this report, four cysteine proteases-one asparaginyl endopeptidase (SPAE), two papain-like cysteine proteases (SPCP1 and SPCP2), and one granulin-containing cysteine protease (SPCP3)-were studied to determine their association with sporamin degradation in sprouting storage roots. Sporamin degradation became significant in the flesh of storage roots starting from week 4 after sprouting and this correlated with expression levels of SPAE and SPCP2, but not of SPCP1 and SPCP3. In the outer flesh near the skin, sporamin degradation was more evident and occurred earlier than in the inner flesh of storage roots. Degradation of sporamins in the outer flesh was inversely correlated with the distance of the storage root from the sprout. Exogenous application of SPAE and SPCP2, but not SPCP3, fusion proteins to crude extracts of the outer flesh (i.e., extracted from a depth of 0.3cm and within 2cm of one-week-old sprouts) promoted in vitro sporamin degradation in a dose-dependent manner. Pre-treatment of SPAE and SPCP2 fusion proteins at 95°C for 5min prior to their application to the crude extracts reduced sporamin degradation. These data show that sweet potato asparaginyl endopeptidase SPAE and papain-like cysteine protease SPCP2 participate in sporamin degradation during storage root sprouting.

  9. An evaluation of cassava, sweet potato and field corn as potential carbohydrate sources for bioethanol production in Alabama and Maryland

    Energy Technology Data Exchange (ETDEWEB)

    Ziska, Lewis H.; Tomecek, Martha; Sicher, Richard [United States Department of Agriculture, Agricultural Research Service, Crop Systems and Global Change Lab, 10300 Baltimore Avenue, Building 1, Beltsville, MD 20705 (United States); Runion, G. Brett; Prior, Stephen A.; Torbet, H. Allen [United States Department of Agriculture, Agricultural Research Service, National Soil Dynamics Laboratory, 411 South Donahue Drive, Auburn, AL 36832 (United States)

    2009-11-15

    The recent emphasis on corn production to meet the increasing demand for bioethanol has resulted in trepidation regarding the sustainability of the global food supply. To assess the potential of alternative crops as sources of bioethanol production, we grew sweet potato (Ipomoea batatas) and cassava (Manihot esculentum) at locations near Auburn, Alabama and Beltsville, Maryland in order to measure root carbohydrate (starch, sucrose, glucose) and root biomass. Averaged for both locations, sweet potato yielded the highest concentration of root carbohydrate (ca 80%), primarily in the form of starch (ca 50%) and sucrose (ca 30%); whereas cassava had root carbohydrate concentrations of (ca 55%), almost entirely as starch. For sweet potato, overall carbohydrate production was 9.4 and 12.7 Mg ha{sup -1} for the Alabama and Maryland sites, respectively. For cassava, carbohydrate production in Maryland was poor, yielding only 2.9 Mg ha{sup -1}. However, in Alabama, carbohydrate production from cassava averaged {proportional_to}10 Mg ha{sup -1}. Relative to carbohydrate production from corn in each location, sweet potato and cassava yielded approximately 1.5 x and 1.6 x as much carbohydrate as corn in Alabama; 2.3 x and 0.5 x for the Maryland site. If economical harvesting and processing techniques could be developed, these data suggest that sweet potato in Maryland, and sweet potato and cassava in Alabama, have greater potential as ethanol sources than existing corn systems, and as such, could be used to replace or offset corn as a source of biofuels. (author)

  10. Nematode population densities and yield of sweet potato and onion as affected by nematicides and time of application.

    Science.gov (United States)

    Hall, M R; Johnson, A W; Smittle, D A

    1988-10-01

    Nematode population densities and yield of sweet potato and onion as affected by nematicides and time of application were determined in a 3-year test. Population densities of Meloidogyne incognita race 1 in untreated plots of sweet potato increased each year, but Helicotylenchus dihystera and Criconemella ornata did not. Ethoprop (6.8 kg a.i./ha) incorporated broadcast in the top 15-cm soil layer each spring before planting sweet potato reduced population densities of nematodes in the soil and increased marketable yield in 1982, but not in 1983 and 1984. When DD, fenamiphos, and aldicarb were applied just before planting either sweet potato or onion, nematode population densities at harvest were lower in treated than in untreated plots. No additional benefits resulted when the nematicides were applied immediately before planting both sweet potato and onion. Correlation coefficients (P sweet potato storage roots vs. densities of M. incognita juveniles in the soil at harvest among years ranged from r = -0.33 to r = -0.54 and r = 0.31 to r = 0.54 (P

  11. Thin-layer drying characteristics of sweet potato slices and mathematical modelling

    Science.gov (United States)

    Doymaz, Ibrahim

    2011-03-01

    The effect of blanching and drying temperature (50, 60 and 70°C) on drying kinetics and rehydration ratio of sweet potatoes was investigated. It was observed that both the drying temperature and blanching affected the drying time and rehydration ratio. The logarithmic model showed the best fit to experimental drying data. The values of effective moisture diffusivity and activation energy ranged from 9.32 × 10-11 to 1.75 × 10-10 m2/s, and 22.7-23.2 kJ/mol, respectively.

  12. Effects of Soil Aeration on Sweet Potato Yield and Its Physiological Mechanism

    Institute of Scientific and Technical Information of China (English)

    SHI Chun-yu; WANG Zhen-lin; YU Song-lie

    2002-01-01

    The effects of soil aeration on physiological characters and root tuber yield of Ipomoea batatas (L.) Lam. CV Lushu7 and Xushu18 were studied. The results showed that soil aeration improvement could increase ATP content and ATPase activity in functional leaves and root tubers and ABA content in root tubers.It also accelerated the transportation of 14C-photosynthate from leaves to root tubers and enhanced dry matter distribution in root tubers and thus root tuber yield was significantly raised. The role of ATP, ATPase and ABA in accelerating the transportation of 14C-photosynthate was discussed based on the changes of soluble carbonhydrate content in sweet potato plant.

  13. Somatic embryogenesis and plant regeneration in tissue cultures of sweet potato (Ipomea batatas Poir.).

    Science.gov (United States)

    Liu, J R; Cantliffe, D J

    1984-06-01

    Leaf, shoot-tip, stem, and root explants of sweet potato (Ipomea batatas Poir.) gave rise to two kinds of callus on nutrient agar medium containing 0.5 to 2.0 mg/l 2,4-D. One callus, bright- to pale-yellow, was compact and organized, while the other was dull-yellow and friable. The former callus gave rise to numerous globular and heart-shaped embryoids. When transferred onto hormone-free medium, the embryoids readily developed into a torpedo-shape before germination. The plantlets were transplanted to soil where they flowered and formed storage roots at maturity.

  14. Combined Application of Biofertilizers and Inorganic Nutrients Improves Sweet Potato Yields

    Science.gov (United States)

    Mukhongo, Ruth W.; Tumuhairwe, John B.; Ebanyat, Peter; AbdelGadir, AbdelAziz H.; Thuita, Moses; Masso, Cargele

    2017-01-01

    Sweet potato [Ipomoea batatas (L) Lam] yields currently stand at 4.5 t ha−1 on smallholder farms in Uganda, despite the attainable yield (45–48 t ha−1) of NASPOT 11 cultivar comparable to the potential yield (45 t ha−1) in sub-Saharan Africa (SSA). On-farm field experiments were conducted for two seasons in the Mt Elgon High Farmlands and Lake Victoria Crescent agro-ecological zones in Uganda to determine the potential of biofertilizers, specifically arbuscular mycorrhizal fungi (AMF), to increase sweet potato yields (NASPOT 11 cultivar). Two kinds of biofertilizers were compared to different rates of phosphorus (P) fertilizer when applied with or without nitrogen (N) and potassium (K). The sweet potato response to treatments was variable across sites (soil types) and seasons, and significant tuber yield increase (p biofertilizer and NPK treatments during the short-rain season in the Ferralsol. Tuber yields ranged from 12.8 to 20.1 t ha−1 in the Rhodic Nitisol (sandy-clay) compared to 7.6 to 14.9 t ha−1 in the Ferralsol (sandy-loam) during the same season. Root colonization was greater in the short-rain season compared to the long-rain season. Biofertilizers combined with N and K realized higher biomass and tuber yield than biofertilizers alone during the short-rain season indicating the need for starter nutrients for hyphal growth and root colonization of AMF. In this study, N0.25PK (34.6 t ha−1) and N0.5PK (32.9 t ha−1) resulted in the highest yield during the long and the short-rain season, respectively, but there was still a yield gap of 11.9 and 13.6 t ha−1 for the cultivar. Therefore, a combination of 90 kg N ha−1 and 100 kg K ha−1 with either 15 or 30 kg P ha−1 can increase sweet potato yield from 4.5 to >30 t ha−1. The results also show that to realize significance of AMF in nutrient depleted soils, starter nutrients should be included. PMID:28348569

  15. 红薯营养价值及综合开发利用研究进展%Nutritional Value and Comprehensive Development and Utilization of Sweet Potato

    Institute of Scientific and Technical Information of China (English)

    吴广辉; 毕韬韬

    2015-01-01

    红薯是我国重要的粮食作物,其中含有淀粉、膳食纤维、蛋白质、维生素、矿物质等多种营养元素,营养价值很高。针对红薯的营养价值和红薯淀粉、红薯全粉、红薯膳食纤维、红薯蛋白、红薯饮料等综合开发利用方面的研究展开阐述,并对红薯综合开发利用发展方面提出了建议。在未来几年红薯综合开发利用方面将会取得更大的成绩,为红薯产业的发展提供更广阔的空间。%Sweet potato is an important food crop in China, which contains starch, dietary fiber, protein, vitamins, minerals and other nutrients, the nutritional value is very high. This paper studies the comprehensive exploitation and utilization of nutritional value of sweet potato and sweet potato starch, sweet potato powder, sweet potato protein, sweet potato beverage, sweet potato dietary fiber etc. are discussed, and suggestions for the comprehensive development and utilization of sweet potato development in the next few years , comprehensive development and utilization of sweet potato will make greater achievements , to provide more the vast space for the development of sweet potato industry.

  16. Effect of biweekly shoot tip harvests on the growth and yield of Georgia Jet sweet potato grown hydroponically

    Science.gov (United States)

    Ogbuehi, Cyriacus R.; Loretan, Phil A.; Bonsi, C. K.; Hill, Walter A.; Morris, Carlton E.; Biswas, P. K.; Mortley, Desmond G.

    1989-01-01

    Sweet potato shoot tips have been shown to be a nutritious green vegetable. A study was conducted to determine the effect of biweekly shoot tip harvests on the growth and yield of Georgia Jet sweet potato grown in the greenhouse using the nutrient film technique (NFT). The nutrient solution consisted of a modified half Hoagland solution. Biweekly shoot tip harvests, beginning 42 days after planting, provided substantial amounts of vegetable greens and did not affect the fresh and dry foliage weights or the storage root number and fresh and dry storage root weights at final harvest. The rates of anion and cation uptake were not affected by tip harvests.

  17. Effect of Heat Treatment on Quality of Sweet Potato in Wrapper Type Cold Store during Long-term Storage

    OpenAIRE

    Hu, Wenzhong; Tanaka, Shun-ichiro; Hori, Yoshiaki

    2004-01-01

    The effects of hot water treatment on the sprouting inhibition and spoilage of sweet potato roots were evaluated in Wrapper Type Cold Store (WTCS) during long-term storage. The changes in quality attribute were also determined. The results indicated that hot water treatment significantly inhibited sprouting and decay of sweet optato for the storage period. It also showed that there were no significant differences ni starch properties in terms of pasting properties, enthalpy and temperatures o...

  18. Research on brewing technique of purple potato vinegar%紫薯醋酿造工艺研究

    Institute of Scientific and Technical Information of China (English)

    林顺; 熊汉国; 涂艳华

    2015-01-01

    Purple potato as raw material was used to produce purple potato vinegar by submerged fermentation after enzymol‐ysis .The results showed that :at 30℃ ,the optimal conditions of alcoholic fermentation was as:initial pH5 ,initial sugar 14% , yeast amount 0 .2 g/(100 ml);the optimal conditions of acetic fermentation was as :initial alcohol content 6% ,acetobacter addi‐tion amount 18% ,volume‐loading 50% .The results had a certain guiding significance for the industrialization of vinegar pro‐duction with potato starch material .%以紫薯为原料,进行酶解处理,再利用液态深层发酵的方法生产紫薯醋,研究了紫薯醋酿造的最佳发酵工艺,结果显示,在温度30℃下,酒精发酵最佳条件为:初始pH5、初始糖度14%、酵母添加量0.2 g/(100 ml);醋酸发酵最佳条件为:初始酒精度为6%、菌种添加量18%、装瓶量50%,对以薯类等淀粉基原料进行醋的工业化生产具有一定指导意义。

  19. Evaluation of Antioxidant Potential and Nutritional Values of White Skinned Sweet Potato-Unripe Plantain Composite Flour Blends

    Directory of Open Access Journals (Sweden)

    S. O. Salawu

    2014-05-01

    Full Text Available Summary. The present investigation sought to evaluate the antioxidant properties, phenolic composition, nutrient composition of Unripe Plantain (UP -White Skinned Sweet potato (WSP flour blends. The flour were mixed in various proportions (UP: WSP; 100:0, 80:20, 60:40, 40:60, 20:80 and 0:100. HPLC/DAD phenolic analyses revealed the presence of some phenolic acids and flavonoids. The result of the antioxidant indices showed a progressive increase with respect to sweet potato inclusion and that high antioxidant indices were recorded for 100% WSP (total phenolic: 1.111mg/g; total flavonoid: 2030mg/g; reducing power: 0.76mg/g; ABTS radical scavenging activity:  3.08 x 10-6mg/g and hydroxyl radical scavenging activity: 82.017%, while the least values were recorded for 100% UP. The  proximate composition analysis  revealed that 100%UP had the highest carbohydrate (78.17%, protein (11.72%, fibre (0.20% and fat (5.56% content compared with whole potato flour and that other blends have a decreasing value with respect to increase in the composition of sweet potato. The highest level of Na, Kwas recorded for 100% UP while 100% WP had the highest level of Mg, Ca and P. These investigations showed that sweet potato-unripe plantain composite blend would be a good source of natural antioxidant as well as providing essential nutrients.Industrial Relevance. Several investigations have revealed the antioxidant and nutritional potentials of sweet potato and unripe-plantain when consumed separately. Also a number of scientific reports provide information on the use of sweet potato and unripe plantain as medicinal foods when consumed separately, and are commonly used as functional food especially in the management of diabetes. Therefore, this study sought to assess the antioxidant and nutritional potentials of phenolic containing unripe plantain (UP and white skinned sweet potato (WSP flour blends with a view identifying the blends with good nutritional and

  20. Resistance of sweet potato clones to meloidogyne incognita races 1 and 3

    Directory of Open Access Journals (Sweden)

    Jorge Augusto Assis Gomes

    2015-09-01

    Full Text Available The objective of this study was to evaluate sweet potato clones for resistance to root-knot nematode, Meloidogyne incognita races 1 and 3. For each nematode physiological race, a greenhouse experiment was set up in a randomized block experimental design with three replications and six plants per plot. Fifty-eight sweet potato clones from the UFVJM germplasm bank were evaluated, plus five commercial cultivars (Brazlândia Rosada, Brazlândia Branca, Palmas, Princesa and Coquinho, plus the cv. Santa Clara tomato (susceptible to Meloidogyne spp.. Stems were planted in 72-cell expanded polystyrene trays, filled with commercial substrate and inoculated with the pathogen thirty days after planting. Forty-five days after inoculation, the eggs were extracted, counted, and later evaluated. Resistance level classification was performed based on reproduction factor (RF and reproduction index (RI. Among the 63 analyzed clones, a percentage of 78% were classified as resistant to M. incognita race 1.79% to race 3 and 67% showed multiple resistance to both M. incognita races.

  1. Resistance of sweet potato clones to meloidogyne incognita races 1 and 3

    Directory of Open Access Journals (Sweden)

    Jorge Augusto Assis Gomes

    2015-01-01

    Full Text Available The objective of this study was to evaluate sweet potato clones for resistance to root-knot nematode, Meloidogyne incognita races 1 and 3. For each nematode physiological race, a greenhouse experiment was set up in a randomized block experimental design with three replications and six plants per plot. Fifty-eight sweet potato clones from the UFVJM germplasm bank were evaluated, plus five commercial cultivars (Brazlândia Rosada, Brazlândia Branca, Palmas, Princesa and Coquinho, plus the cv. Santa Clara tomato (susceptible to Meloidogyne spp.. Stems were planted in 72-cell expanded polystyrene trays, filled with commercial substrate and inoculated with the pathogen thirty days after planting. Forty-five days after inoculation, the eggs were extracted, counted, and later evaluated. Resistance level classification was performed based on reproduction factor (RF and reproduction index (RI. Among the 63 analyzed clones, a percentage of 78% were classified as resistant to M. incognita race 1.79% to race 3 and 67% showed multiple resistance to both M. incognita races.

  2. Effect of Hydroxypropylation on Functional Properties of Different Cultivars of Sweet Potato Starch in Sri Lanka.

    Science.gov (United States)

    Senanayake, Suraji; Gunaratne, Anil; Ranaweera, K K D S; Bamunuarachchi, Arthur

    2014-01-01

    Starches obtained from different cultivars of sweet potatoes commonly consumed in Sri Lanka, were chemically modified with hydroxypropyl substitution, to analyze the changes in the physicochemical properties. Significant changes (P syneresis) of starch gels (7.0% db) during cold and frozen storage were observed due to the modification. Hydroxypropylation increased the gel stability, water solubility, digestibility, and storage stability of the native starches in the cold storage to a significant level. Lowered gelatinization and retrogradation enthalpies as well as gelatinization temperature were observed for derivatized starches compared to the native starch. Low levels of pasting stability with increased levels of breakdown and reduced cold paste viscosity were observed in the hydroxypropylated starch samples except for the Malaysian cultivar (S5). Chemically modified starch gels stored under cold storage did not show a syneresis for two weeks in the cycle and the frozen storage showed much improved stability in the starch gels within the four-week cycle. Chemical modification of sweet potato starch with hydroxyl propyl substitution can enhance the functional characteristics of the native starch which will improve its potential application in the food industry.

  3. Antioxidant Property Enhancement of Sweet Potato Flour under Simulated Gastrointestinal pH

    Directory of Open Access Journals (Sweden)

    Maznah Ismail

    2012-07-01

    Full Text Available Sweet potato is known to be rich in healthful antioxidants, but the stability of its antioxidant properties under gastrointestinal pH is very much unknown. Hence, this study aimed to evaluate the changes in antioxidant properties (total contents of phenolics and flavonoids as well as antioxidant activity of sweet potato flour (SPF under simulated gastrointestinal pH conditions. It was found that the yield of SPF crude phenolic extract increased from 0.29 to 3.22 g/100 g SPF upon subjection to gastrointestinal pH conditions (p < 0.05. Also elevated significantly were the total phenolic content (TPC, total flavonoid content (TFC and antioxidant activity of SPF (p < 0.05. In summary, the antioxidant properties of SPF were enhanced under gastrointestinal pH conditions, suggesting that SPF might possess a considerable amount of bound phenolic and other antioxidative compounds. The antioxidant properties of SPF are largely influenced by pH and thus might be enhanced during the in vivo digestive process.

  4. Excess iron-induced changes in the photosynthetic characteristics of sweet potato.

    Science.gov (United States)

    Adamski, Janete M; Peters, José A; Danieloski, Rodrigo; Bacarin, Marcos A

    2011-11-15

    Iron (Fe) is an essential nutrient for plant growth and development. In plant tissues, approximately 80% of Fe is found in photosynthetic cells. This study was carried out to determine the effect of different iron concentrations on the photosynthetic characteristics of sweet potato plants. The fluorescence transient of chlorophyll a (OJIP), chlorophyll index and gas exchange were measured in plants grown for seven days in Hoagland solution containing an iron concentration of 0.45, 0.90, 4.50 or 9.00 mM Fe (as Fe-EDTA). The initial and maximum fluorescence increased in the plants receiving 9.00 mM Fe. In the analysis of the fluorescence kinetic difference, L- and K-bands appeared in all of the treatments, but the amplitude was higher in plants receiving 4.50 or 9.00 mM Fe. In plants grown in 9.00 mM Fe, the parameters of the JIP-Test indicated a better efficiency in the capture, absorption and use of light energy, and although the chlorophyll index was higher, the net photosynthesis was lower. The overall data showed that sweet potato plants subjected to high iron concentrations may not exhibit the toxicity symptoms, but the light reactions of photosynthesis can be affect, which may result in a declining net assimilation rate.

  5. Amperometric biosensor for the determination of phenols using a crude extract of sweet potato

    Energy Technology Data Exchange (ETDEWEB)

    Cruz Vieira, I. da; Fatibello-Filho, O. [Universidade Federal de Sa Carlos (Brazil)

    1997-03-01

    An amperometric biosensor for the determination of phenols is proposed using a crude extract of sweet potato (Ipomoea batatas (L.) Lam.) as an enzymatic source of polyphenol oxidase (PPO; tyrosinase; catechol oxidase; EC 1.14.18.1). The biosensor is constructed by the immobilization of sweet potato crude extract with glutaraldehyde and bovine serum albumin onto an oxygen membrane. This biosensor provides a linear response for catechol, pyrogallol, phenol and p-cresol in the concentration ranges of 2.0 x 10{sup -5} -4.3 x 10{sup -4} mol L{sup -1}, 2.0 x 10{sup -5} -4.3 x 10{sup -4} mol L{sup -1}, 2.0 x 10{sup -5} -4.5 x 10{sup -4} mol L{sup -1} and 2.0 x 10{sup -5} -4.5 x 10{sup -4} mol L{sup -1}, respectively. The response time was about 3-5 min for the useful response range, and the lifetime of this electrode was excellent for fifteen days (over 220 determinations for each enzymatic membrane). Application of this biosensor for the determination of phenols in industrial wastewaters is presented.

  6. Application of Hydrothermally Modified Sweet Potato Starch as a Substitute Additive for Soup Mixture

    Directory of Open Access Journals (Sweden)

    S. A. Senanayake

    2014-01-01

    Full Text Available Potential application of modified sweet potato starch as a substitute thickener for corn starch was studied, by using native starches extracted from five different cultivars of sweet potatoes commonly available in Sri Lanka. Physicochemical properties (swelling power, water solubility index, pasting, and gelatinization and digestibility of native and modified (heat-moisture treated, 20% moisture, 85°C for 6 hrs starches were analysed. Modified Swp3 (Wariyapola white, Swp4 (Pallepola, and Swp5 (Malaysian starches were selected based on the favourable conditions shown in the required physical and chemical properties and applied in a vegetable soup formula as a thickening aid. Corn starch added samples were kept as controls and the viscosity difference and sensory attributes were tested. Viscosity of the reconstituted soup powder and sensory analysis showed that Swp4 and Swp5 had significantly high level (P<0.05 of sensory quality and the average rank for mouth feel (taste, texture and overall acceptability was significantly high (P<0.05 in Swp5 added samples. Shelf life studies ensured 6 months of stability with negligible level of moisture increase and total plate count in air tight polypropylene packages at ambient temperatures (28–31°C. Results of this study revealed a possibility of applying physically modified Swp4 and Swp5 starches as a substituent food ingredient for commercially available corn starch to improve the thickness of food products.

  7. Effect of Hydroxypropylation on Functional Properties of Different Cultivars of Sweet Potato Starch in Sri Lanka

    Directory of Open Access Journals (Sweden)

    Suraji Senanayake

    2014-01-01

    Full Text Available Starches obtained from different cultivars of sweet potatoes commonly consumed in Sri Lanka, were chemically modified with hydroxypropyl substitution, to analyze the changes in the physicochemical properties. Significant changes (P<0.05 in the crude digestibility level, thermal properties, and the water separation (syneresis of starch gels (7.0% db during cold and frozen storage were observed due to the modification. Hydroxypropylation increased the gel stability, water solubility, digestibility, and storage stability of the native starches in the cold storage to a significant level. Lowered gelatinization and retrogradation enthalpies as well as gelatinization temperature were observed for derivatized starches compared to the native starch. Low levels of pasting stability with increased levels of breakdown and reduced cold paste viscosity were observed in the hydroxypropylated starch samples except for the Malaysian cultivar (S5. Chemically modified starch gels stored under cold storage did not show a syneresis for two weeks in the cycle and the frozen storage showed much improved stability in the starch gels within the four-week cycle. Chemical modification of sweet potato starch with hydroxyl propyl substitution can enhance the functional characteristics of the native starch which will improve its potential application in the food industry.

  8. PENGUJIAN SIFAT PREBIOTIK DAN SINBIOTIK PRODUK OLAHAN UBI JALAR SECARA IN VIVO [In Vivo Evaluation of Prebiotic and Synbiotic Properties of Processed Sweet Potato Products

    Directory of Open Access Journals (Sweden)

    Lilis Nuraida1,2

    2008-12-01

    Full Text Available The aims of this research were to investigate the prebiotic and synbiotic properties of sweet potato products (combined with L. casei subsp Rhamnosus for probiotic in increasing the number of Lactic Acid Bacteria (LAB and suppressing the number of E. coli and the occurrence of Salmonella in vivo. Some previous study showed that sweet potato is a potent source of prebiotic. The sweet potato products evaluated were sweet potato flakes (SPF and sweet potato ice cream mix. The in vivo assay used male rat strain Sprague-Dawley. Total microbes, LAB, E. coli and Salmonella in fecal were analyzed before, during and after feeding period. Feeding with SPF as prebiotic, L. casei subsp Rhamnosus as probiotic, and combination of both as synbiotic for ten days were able to increase the number of LAB (0.4-1.1 log CFU/g and suppress the number of E. coli in rat feces (1.5-1.7 log CFU/g. All of the treatment did not affect the occurrence of Salmonella in rat feces. The treatment of sweet potato ice cream mix as prebiotics and the combination of sweet potato ice cream mix and L. casei subsp. Rhamnosus as synbiotic for ten days did not effect the number of LAB and E. coli in rat feces.

  9. PENGARUH ISOTERM SORPSI AIR TERHADAP STABILITAS BERAS UBI [Effect of Moisture Sorption Isotherm to Stability of “Sweet Potato Rice”

    Directory of Open Access Journals (Sweden)

    Sri Widowati1*

    2010-12-01

    Full Text Available “Sweet Potato Rice” stability as a dry food product was determined by water activity (aw and equilibrium moisture content (Me. This relationship is known as moisture sorption isotherm. This research were aimed 1 to study moisture sorption isotherm of “Sweet Potato Rice” from sweet potato flour (Cangkuang variety and native/heat moisture treatment (HMT starch which was stored at the range of aw:0.06 - 0.96 and 28oC; 2 to determine an appropriate model for describing product moisture sorption isotherm and 3 to predict “Sweet Potato Rice” shelf of life. Experimental design used was a random complete design with two factor, namely: 1 sweet potato starch: native and HMT, and 2 packaging material: polyethylene (PE and polypropylene (PP.The result showed that the moisture sorption isotherm profiles were sigmoid. Smith equation was the best model which described moisture sorption isotherm with R2= 0,991-0,993 for adsorption and R2= 0,964-0,971 for desorption. Shelf life test showed that “Sweet Potato Rice” from Cangkuang flour and modified starch had longer shelf life (5.67 months when packed in PP bag and 2.3 months when packed in PE bag; while shelf life artificial sweet potato made from Cangkuang flour and native starch was 4.24 months when packed in PP bag and 1.72 months when packed in PE bag.

  10. Complete Genome Sequence of Kosakonia sacchari Strain BO-1, an Endophytic Diazotroph Isolated from a Sweet Potato

    Science.gov (United States)

    Shinjo, Rina; Uesaka, Kazuma; Ihara, Kunio; Loshakova, Kseniia; Mizuno, Yuri; Yano, Katsuya

    2016-01-01

    The complete genome sequence of the endophytic diazotroph Kosakonia sacchari, isolated from a sweet potato, was analyzed. The 4,902,106-bp genome with 53.7% G+C content comprises 4,638 open reading frames, including nif genes, 84 tRNAs, and seven complete rRNAs in a circular chromosome. PMID:27609910

  11. Exploring the benefits of growing bioenergy crops to activate lead-contaminated agricultural land: a case study on sweet potatoes.

    Science.gov (United States)

    Cheng, Shu-Fen; Huang, Chin-Yuan; Chen, Kuo-Lin; Lin, Sheng-Chien; Lin, Yung-Cheng

    2015-03-01

    Phytoremediation is the most environmentally friendly remediation technology for heavy metal contaminated soil. However, the phytoremediation approach requires a long time to yield results, and the plants used must be economically profitable to maintain the sustainability of the process. Because high levels of bioethanol can be produced from sweet potatoes, an experiment was conducted by planting sweet potatoes in a lead-contaminated site to observe their growth and lead-uptake capacity, thereby enabling the evaluation of the phytoremediation efficiency of sweet potatoes. The lead content in the soil was approximately 6000 mg kg(-1), and the phytoavailable Pb content was 1766 mg kg(-1). Three starch-rich sweet potato varieties, Tainung No. 10 (TNG-10), Tainung No. 31 (TNG-31), and Tainung No. 57 (TNG-57), were used in the experiment. The results indicated that TNG-10, TNG-31, and TNG-57 had fresh root tuber yields of 94.5, 133.0, and 47.5 ton ha(-1) year(-1), produced 9450, 13,297, and 4748 L ha(-1) year(-1) of bioethanol, and removed 2.68, 7.73, and 3.22 kg ha(-1) year(-1) of lead, respectively. TNG-31 yielded the highest bioethanol production and the highest lead removal in the lead-contaminated site. Therefore, implementing phytoremediation by planting TNG-31 would decrease lead content and generate income, thereby rendering the sustainable and applicable activation of contaminated soil possible.

  12. Novel begomovirus species of recombinant nature in sweet potato (Ipomoea batatas) and Ipomoea indica: taxonomic and phylogenetic implications.

    Science.gov (United States)

    Lozano, Gloria; Trenado, Helena P; Valverde, Rodrigo A; Navas-Castillo, Jesús

    2009-10-01

    Viral diseases occur wherever sweet potato (Ipomoea batatas) is cultivated and because this crop is vegetatively propagated, accumulation and perpetuation of viruses can become a major constraint for production. Up to 90% reductions in yield have been reported in association with viral infections. About 20 officially accepted or tentative virus species have been found in sweet potato and other Ipomoea species. They include three species of begomoviruses (genus Begomovirus, family Geminiviridae) whose genomes have been fully sequenced. In this investigation, we conducted a search for begomoviruses infecting sweet potato and Ipomoea indica in Spain and characterized the complete genome of 15 isolates. In addition to sweet potato leaf curl virus (SPLCV) and Ipomoea yellowing vein virus, we identified three new begomovirus species and a novel strain of SPLCV. Our analysis also demonstrated that extensive recombination events have shaped the populations of Ipomoea-infecting begomoviruses in Spain. The increased complexity of the unique Ipomoea-infecting begomovirus group, highlighted by our results, open new horizons to understand the phylogeny and evolution of the family Geminiviridae.

  13. Distribution of phosphorus and hydroxypropyl groups within granules of modified sweet potato starches as determined after chemical peeling

    NARCIS (Netherlands)

    Zhao, J.; Schols, H.A.; Chen Zenghong,; Jin, Z.; Buwalda, P.; Gruppen, H.

    2015-01-01

    The distributions of phosphorus and hydroxypropyl groups within granules of cross-linked and hydroxypropylated sweet potato starches were investigated. Chemical surface peeling of starch granules was performed after sieving of native and modified starches into large-size (diameter = 20 µm) and small

  14. Field studies of sweet potatoes and cowpeas in response to elevated carbon dioxide. Progress report. [Ipomoea batatas; Vigna unguiculata

    Energy Technology Data Exchange (ETDEWEB)

    Biswas, P.K.

    1985-01-01

    The physiological and biochemical effects of enriched CO/sub 2/ on sweet potatoes and cowpeas were studied in open top chambers. The main task was to assemble equipment to generate test atmospheres of CO/sub 2/ in the field, using open top chambers as the basic exposure unit for studying the response of sweet potatoes and cowpeas to enriched CO/sub 2/. Plant responses to CO/sub 2/ in open top chambers have been demonstrated by several investigators in a variety of crops. This study focused on growth and development of both sweet potatoes and cowpeas at levels of CO/sub 2/ ranging from the ambient level of 354 ppM to 659 ppM. The effects of CO/sub 2/ on leaf and stem weights, stem length, leaf area, and stomatal number and conductance were studied on both species. Additional studies on sweet potatoes included the effects of CO/sub 2/ on the weight, chemical content and quality of tubers. Additional studies on cowpeas included the effects of CO/sub 2/ on the weight of seeds and rate of nitrogen fixation. 27 figs., 35 tabs. (ACR)

  15. Sweet potato yields and nutrient dynamics after short-term fallows in the humid lowlands of Papua New Guinea

    NARCIS (Netherlands)

    Hartemink, A.E.

    2003-01-01

    Shifting cultivation is common in the humid lowlands of Papua New Guinea but little is known about the effect of different fallows on sweet potato (Ipomoea batatas) yield and nutrient flows and pools in these systems. An experiment was conducted in which two woody fallow species (Piper aduncum and

  16. Effect of channel size on sweet potato storage root enlargement in the Tuskegee University hydroponic nutrient film system

    Science.gov (United States)

    Morris, Carlton E.; Martinez, Edwin; Bonsi, C. K.; Mortley, Desmond G.; Hill, Walter A.; Ogbuehi, Cyriacus R.; Loretan, Phil A.

    1989-01-01

    The potential of the sweet potato as a food source for future long term manned space missions is being evaluated for NASA's Controlled Ecological Life Support Systems (CELSS) program. Sweet potatoes have been successfully grown in a specially designed Tuskegee University nutrient film technique (TU NFT) system. This hydroponic system yielded storage roots as high as 1790 g/plant fresh weight. In order to determine the effect of channel size on the yield of sweet potatoes, the width and depth of the growing channels were varied in two separate experiments. Widths were studied using the rectangular TU NFT channels with widths of 15 cm (6 in), 30 cm (12 in) and 45 cm (18 in). Channel depths of 5 cm (2 in), 10 cm (4 in), and 15 cm (6 in) were studied using a standard NASA fan shaped Biomass Production Chamber (BPC) channel. A comparison of preliminary results indicated that, except for storage root number, the growth and yield of sweet potatoes were not affected by channel width. Storage root yield was affected by channel depth although storage root number and foliage growth were not. Both experiments are being repeated.

  17. A Functional mathematical index for predicting effects of food processing on eight sweet potato(Ipomoea batatas)cultivars

    Science.gov (United States)

    In this paper we apply an improved functional mathematical index (FMI), modified from those presented in previous publications, to define the influence of different cooking processes of eight sweet potato (Ipomoea batatas) cultivars on composition of six bioactive phenolic compounds (flavonoids). Th...

  18. An evaluation of cassava, sweet potato and field corn as potential carbohydrate sources for bioethanol production in Alabama and Maryland

    Science.gov (United States)

    The recent emphasis on corn production to meet the increasing demand for bioethanol has resulted in trepidation regarding the sustainability of the global food supply. To assess the potential of alternative crops as sources of bioethanol production, we grew sweet potato (Ipomoea batatas) and cassav...

  19. Gluten-free bread with an addition of freeze-dried red and purple potatoes as a source of phenolic compounds in gluten-free diet.

    Science.gov (United States)

    Gumul, Dorota; Ziobro, Rafał; Ivanišová, Eva; Korus, Anna; Árvay, Július; Tóth, Tomáš

    2017-02-01

    The basis for gluten-free diet is often gluten-free bread, which is usually characterized by a low-nutritional value, and lacks any pro-health properties. Only after an introduction of gluten-free raw materials, containing high level of bioactive compounds it would be possible to obtain the product with a pro-health potential. The aim of the study was to analyze the content of bioactive compounds (total phenolic content, phenolic acids, flavonoids, flavonols, anthocyanins and carotenoids) in gluten-free bread prepared with 5% addition of freeze-dried red and purple potatoes as well as to assess their antioxidant potential. Summarizing, among the analyzed gluten-free breads with an addition of freeze-dried red and purple potatoes, the best results could be obtained by using variety Magenta Love (red potato), which provided the highest levels of phenolic compounds and carotenoids and also antioxidant and antiradical activity.

  20. Comparisons of coat protein gene sequences show that East African isolates of Sweet potato feathery mottle virus form a genetically distinct group.

    Science.gov (United States)

    Kreuze, J F; Karyeija, R F; Gibson, R W; Valkonen, J P

    2000-01-01

    Sweet potato feathery mottle virus (SPFMV, genus Potyvirus) infects sweet potatoes (Ipomoea batatas) worldwide, but no sequence data on isolates from Africa are available. Coat protein (CP) gene sequences from eight East African isolates from Madagascar and different districts of Uganda (the second biggest sweet potato producer in the world) and two West African isolates from Nigeria and Niger were determined. They were compared by phylogenetic analysis with the previously reported sequences of ten SPFMV isolates from other continents. The East African SPFMV isolates formed a distinct cluster, whereas the other isolates were not clustered according to geographic origin. These data indicate that East African isolates of SPFMV form a genetically unique group.

  1. Effects of granule size of cross-linked and hydroxypropylated sweet potato starches on their physicochemical properties.

    Science.gov (United States)

    Zhao, Jianwei; Chen, Zhenghong; Jin, Zhengyu; Buwalda, Piet; Gruppen, Harry; Schols, Henk A

    2015-05-13

    Sweet potato starch was modified by cross-linking, hydroxypropylation, and combined cross-linking and hydroxypropylation, and the starches were subsequently sieved to obtain differently sized granule fractions. The effects of granule size of native and modified sweet potato starch fractions and all fractions were investigated with respect to their physicochemical properties. The large-size granule fraction (27-30 μm) showed a 16-20% higher chemical phosphorylation and a 4-7% higher hydroxypropylation than the small-size granule fraction (14-16 μm). The large-size granule fractions of native and modified sweet potato starches showed lower transition temperatures (0.7-3.1 °C for peak temperature of gelatinization) and lower enthalpy changes (0.6-1.9 J/g) during gelatinization than the small-size granule fractions, making the sweet potato starch different from cereal starches. The large-size granule fraction of native starch showed a higher paste viscosity (78-244 cP) than the corresponding small-size granule fraction. In addition, cross-linking and hydroxypropylation affected the paste viscosity of the large-size granule fraction significantly more than that of the small-size granule fraction when compared to the corresponding parental starch fractions. The large-size granule fraction of native and dual-modified starches showed a lower syneresis after freeze-thaw treatments than the small-size granule fractions. The difference in swelling power between large- and small-size granule fractions was not significant. In general, the large-size granule fraction of sweet potato starch was more susceptible for cross-linking and hydroxypropylation and the physicochemical properties were changed to a higher extent compared to the corresponding small-size granule fraction.

  2. Quality attributes of sweet potato flour as influenced by variety, pretreatment and drying method.

    Science.gov (United States)

    Olatunde, Ganiyat O; Henshaw, Folake O; Idowu, Michael A; Tomlins, Keith

    2016-07-01

    The effect of pretreatment methods (soaking in water, potassium metabisulphite solution, and blanching) and drying methods (sun and oven) on some quality attributes of flour from ten varieties of sweet potato roots were investigated. The quality attributes determined were chemical composition and functional properties. Data obtained were subjected to descriptive statistics, multivariate analysis of variance, and Pearson's correlation. The range of values for properties of sweet potato flour were: moisture (8.06-12.86 ± 1.13%), starch (55.76-83.65 ± 6.82%), amylose (10.06-21.26 ± 3.92%), total sugar (22.39-125.46 ± 24.68 μg/mg), water absorption capacity (140-280 ± 26), water solubility (6.89-26.18 ± 3.80), swelling power (1.66-5.00 ± 0.50), peak viscosity (24.50-260.92 ± 52.61 RVU), trough (7.08-145.83 ± 34.48 RVU), breakdown viscosity (11.00-125.33 RVU), final viscosity (10.21-225.50 ± 60.55 RVU), setback viscosity (3.04-92.21 RVU), peak time (6.07-9.06 min) and pasting temperature (69.8-81.3°C). Variety had a significant (P  0.05) affect moisture, fat and lightness (L*). Drying method did not significantly (P > 0.05) affect fiber and L*. The interactive effect of variety, pretreatment and drying method had a significant (P fiber. Total sugar correlated significantly (P < 0.01) with water solubility (r = 0.88) of the flour samples. Variety was a dominant factor influencing attributes of sweet potato flour and so should be targeted at specific end uses.

  3. Plant Regeneration of Sweet Potato via Somatic Embryogenesis from Different Explants

    Institute of Scientific and Technical Information of China (English)

    Ling ZHANG; Hongxuan XU; Baifu QIN; Zhihua LIA0; Min CHEN; Chunxian YANG; Yufan FU; Qitang ZHANG

    2012-01-01

    [Objective] This study aimed to regenerate plants of sweet potato (Ipomoea batatas) cultivar Xushu22 via somatic embryogenesis, using leaf and shoot apex as explants. [Method] The leaf and shoot apex of Xushu 22 were separately cultured on MSB medium and MSD medium. The induced embryogenic calluses were then cultured on MS medium. The regeneration frequency of leaf and shoot apex ex- plants were respectively calculated. [Result] The average frequency of leaf explants developing somatic callus was 95.69% compared to 30.56% in case of shoot apex explants. There were different types of morphogenic structures in the process of so- matic embryo development. Leaf explants gave a high regeneration frequency to 60.61%, while the regeneration frequency of shoot apices was 22%. In addition, no morphological variations were observed in the regeneration plants. [Conclusion] Leaf explant was better than shoot apices in plant regeneration of Xushu22 via somatic embryogenesis.

  4. A photographic approach to the possible mechanism of retrogradation of sweet potato starch.

    Science.gov (United States)

    Lian, Xijun; Zhao, Shuyi; Liu, Qinsheng; Zhang, Xu

    2011-01-01

    Although the subject of starch retrogradation has been studied for about 20 years, the mechanism of starch retrogradation seems not yet to be completely established. In this paper, the possible retrogradation mechanism of sweet potato starch was postulated from four optical micrographs at the stages of melting of the starch granules, autoclaving treatment and aging. The possible process of retrogradation consists of three stages. Firstly, starch granules was swelled and melted with loss of X-ray crystallinity and formation of both crystalline and amorphous lamellae; secondly, in crystalline lamellae, amylopectin began to form nucleation when they were autoclaved; finally, the nucleus grew up to great rod-like crystals as the result of congregating of amylose on plates which were composed of and prolongated by amylopectin.

  5. Physicochemical Characteristics of Composite Flour Made from Cassava, Sweet Potato, Corn and Rice Bran

    Directory of Open Access Journals (Sweden)

    Alvi Yani

    2014-01-01

    Full Text Available Lampung province is one of production center for food commodities such as cassava, maize and sweet potato. The development of these commodities into processed products has been done one of which is a composite flour. The purpose of this study was to determine the physicochemical characteristics of composite flour consisting of a mixture of cassava flour (CF, sweet potato flour (SPF and corn flour (NF. The study was conducted in the Laboratory of Lampung Assessment Institute for  Agriculture  Technology (AIAT and Laboratory of Food Chemistry and Technology, Indonesian Legumes and Tuber Crops Research Institute (ILETRI on May – July 2014. The design used was completely randomized by four treatments such as F1 (60% CF, 0% SPF, 35% NF, 5% Rice Bran/RB , F2 (50% CF, 10% SPF, 35% NF, 5% RB, F3 (40% CF, 20% SPF, 35% NF, 5% RB and F4 (30% CF, 30% SPF, 35% NF, 5% RB, and the activities was repeated 4 times. The data were statistically analyzed and followed by Duncan Multiple range test. Physical characteristics observed were whiteness, water content, water absorption value (NPA and the water solubility value (NKA. While the chemical characteristics of proximate analysis consist of moisture content, protein, carbohydrates, fat, fiber and ash content by AOAC Methods. The results showed that the whiteness value of four composite flours were not different in the ranged between 57.97% (F4 and 60.37% (F1. While the carbohydrates content ranged from 81.17 to 83.3% (the highest in the F4, protein was from 3.70 to 4.47% (the highest in the F4, fat was from 1.41 to 1.50%, ash content was from 01.47 - 1.66%, 1.81 - 2.17% for crude fiber, 11.64 to 18.80% for amylose, while amylopectin content ranged from 36.68 to 43.98%.

  6. 湘味甘薯挤压膨化食品配方研究%Study on Formula of Extruded Hunan Taste Sweet Potato

    Institute of Scientific and Technical Information of China (English)

    徐妹华; 易有金; 聂灿华; 夏延斌

    2014-01-01

    以甘薯全粉和小麦粉为主要原料,研制一种新型湘味甘薯挤压膨化熟食。从甘薯全粉、小麦粉、物料水、食盐添加量等方面对湘味甘薯挤压膨化熟食产品品质的影响进行研究,试验得出湘味甘薯挤压膨化熟食的最佳配方为:36.77%甘薯全粉、36.77%小麦粉、18.57%水、6.98%食盐、0.91%复合料。%Sweet potato flour and wheat flour as raw materials, we developed a new type of Hunan taste sweet potato extrusion puffed food. The influence of the amount of sweet potato flour, wheat flour, water, salt added on the quality of Hunan taste sweet potato extrusion cooked food were studied. Results showed that the best formula of extruded Hunan taste sweet potato was sweet potato flour 36. 77%, wheat flour 36. 77%, water 18. 57%, sodium chloride 6. 98%, and the composite material 0. 91%.

  7. Effect of Pre-treatments on the Sweet Potato of Explosion Puffing Drying at Variable Temperature and Pressure Difference of Sweet Potato Chips%前处理对甘薯变温压差膨化效果影响

    Institute of Scientific and Technical Information of China (English)

    宋阳; 罗红霞; 句容辉; 迟全勃; 王建

    2012-01-01

    研究不同切片厚度、热烫、冷冻和浸渍等4个因素对甘薯变温压差膨化干燥产品含水率、硬度、色泽和复水比的影响。结果表明:甘薯切片的最佳厚度为2mm,物料经浸渍处理所得产品品质较优;糖液浸渍预处理使物料加速失水,对物料色泽和外形的保持有显著的作用;在果葡糖浆、麦芽糖浆、麦芽糖醇中,选用麦芽糖浆作为预处理的浸渍溶液,且浓度为15%,浸渍时间为8h产品质量较好。%The influence of different piece thickness, water blanching, freezing and infusing of water content, hardness, color, and rehydration rate of explosion puffing drying for sweet potato chips was investigated. The results showed that the optimum thickness of the sweet potato chips used was 2 mm; infusing pretreatment improved the quality of sweet potato chips; the sugar fluid infusing pretreatment accelerated the dehydration of the product, obviously maintained the color and the shape. Sweet potato chips could get good quality soaked in glucose syrup, maltose so 1 ution and maltose mellowness, better in maltose so l ution concentration of 15% for 8 h.

  8. 甘薯全粉加工及其挤压膨化食品特性的分析研究%Processing of Sweet Potato Powder and Analysis of the Characteristics of Extruded Sweet Potato Foods

    Institute of Scientific and Technical Information of China (English)

    冯凤琴; 刘东红; 叶立扬

    2001-01-01

    The processing technology of sweet potato powder and the possibility to manufacture nutritive foods with sweet potato powder as main raw material by extrusion technology was studied. And the changes of nutritive components and physical-chemical properties during extrusion were analyzed. The results showed that the starch and protein in the product decreased, and total soluble saccharides increased, while water absorption index and water soluble index increased and the color darkened after extrusion, there was characteristic flavor of sweet potato produced.%探讨制备高品质甘薯全粉的简便方法,及以甘薯全粉为主要原料,通过挤压膨化技术生产甘薯营养食品的可能性,并对挤压膨化过程中营养成分及理化性质的变化进行了研究分析。结果表明,经挤压膨化后,原料中淀粉、蛋白质含量略有下降,总糖含量上升,吸水性,水溶性指数增大,色泽略有加深,并有浓郁的特征香味产生。

  9. Diversity and evolutionary relationship of nucleotide binding site-encoding disease-resistance gene analogues in sweet potato (Ipomoea batatas Lam.)

    Indian Academy of Sciences (India)

    Guanshui Chen; Daren Pan; Yifei Zhou; Sheng Lin; Xiangde Ke

    2007-06-01

    Most plant disease-resistance genes (-genes) isolated so far encode proteins with a nucleotide binding site (NBS) domain and belong to a superfamily. NBS domains related to -genes show a highly conserved backbone of an amino acid motif, which makes it possible to isolate resistance gene analogues (RGAs) by degenerate primers. Degenerate primers based on the conserved motif (P-loop and GLPL) of the NBS domain from -genes were used to isolate RGAs from the genomic DNA of sweet potato cultivar Qingnong no. 2. Five distinct clusters of RGAs (22 sequences) with the characteristic NBS representing a highly diverse sample were identified in sweet potato genomic DNA. Sequence identity among the 22 RGA nucleotide sequences ranged from 41.2% to 99.4%, while the deduced amino acid sequence identity from the 22 RGAs ranged from 20.6% to 100%. The analysis of sweet potato RGA sequences suggested mutation as the primary source of diversity. The phylogenetic analyses for RGA nucleotide sequences and deduced amino acids showed that RGAs from sweet potato were classified into two distinct groups—toll and interleukin receptor-1 (TIR)-NBS-LRR and non-TIR-NBS-LRR. The high degree of similarity between sweet potato RGAs and NBS sequences derived from -genes cloned from tomato, tobacco, flax and potato suggest an ancestral relationship. Further studies showed that the ratio of non-synonymous to synonymous substitution within families was low. These data obtained from sweet potato suggest that the evolution of NBS-encoding sequences in sweet potato occur by the gradual accumulation of mutations leading to purifying selection and slow rates of divergence within distinct -gene families.

  10. Salicylic acid-mediated elicitation of tomato defense against infection by potato purple top phytoplasma

    Science.gov (United States)

    Recent outbreaks and continued spread of phytoplasma infection-associated diseases in potato, tomato, and other vegetable crops in the U.S. accentuates the need for practical strategies to mitigate the impact of the phytoplasmal diseases. The purpose of the current study was to investigate whether ...

  11. Iron bioavailability of sweet potato and moringa leaves in comparision with leafy green vegetables commonly consumed in Ghana

    OpenAIRE

    2016-01-01

    Introduction: Iron deficiency anaemia (IDA) is a significant public health problem in Northern Ghana especially amongst women and children. Leafy green vegetables are major contributors to iron intake in this part of the world; poor iron bioavailability from these food sources may be part of the reason for the high prevalence of IDA. Evidence suggests that sweet potato and Moringa leaves might be better sources of bioavailable iron, compared with other leafy green vegetables, as both have hig...

  12. Characteristics of Fermentation Drink made from Juice of Winged Bean Sprouts (Psophocarpus tetragonolobus and Red Sweet Potato (Ipomoea batatas

    Directory of Open Access Journals (Sweden)

    Novelina Novelina

    2013-01-01

    Full Text Available Fermented milk is a product that was produced from fermentation of fresh milk using lactic acid bacteria, such as Lactobacillus bulgaricus and Streptococcus thermophilus. A variety of plant materials can also be used as raw material in making of  fermentation drinks, such as nuts and tubers. The purpose of this study was to investigate the characteristics of fermentation drink made from juice of winged bean sprout and red sweet potatoes. The treatment in this study is the level of mixing between juice of winged bean sprout with red sweet potatoes , consist of ;A (30:70, B (40:60, C (50:50, D (60:40 and E (70:30. Completely randomized design had been used with 5 treatments and 3 replications. The data colected was pH, viscosity, protein content, fat content, total solids, total acid, ash content, calcium content, total lactic acid bacteria, total plate count and sensory evaluation. Data processing is performed using statistical 8, followed by Tuckey test HSD All-Pair wise Comparisons Test at level of 5%. Mixing of winged bean sprouts with red sweet potato can increase the value of pH, viscosity, protein content, fat content, total solids, total acid, ash content, calcium content, and total lactic acid bacteria. The best product was the product of B (40% winged bean sprout and 60% red sweet potatoes already meets SNI 7552:2009, contain : 2.36% protein content, fat content of 1.24%, 18.77% total solids, pH was 4, 2, 0.54% total acid, 0.23% ash content, 0.173% calcium content, viscosity was 3.56 DPA,  total  lactic acid bacteria (CFU / ml was 1.9 x1010 , total plate count was 2.1 x1010 (CFU / ml.

  13. Digital gene expression analysis based on integrated de novo transcriptome assembly of sweet potato [Ipomoea batatas (L. Lam].

    Directory of Open Access Journals (Sweden)

    Xiang Tao

    Full Text Available BACKGROUND: Sweet potato (Ipomoea batatas L. [Lam.] ranks among the top six most important food crops in the world. It is widely grown throughout the world with high and stable yield, strong adaptability, rich nutrient content, and multiple uses. However, little is known about the molecular biology of this important non-model organism due to lack of genomic resources. Hence, studies based on high-throughput sequencing technologies are needed to get a comprehensive and integrated genomic resource and better understanding of gene expression patterns in different tissues and at various developmental stages. METHODOLOGY/PRINCIPAL FINDINGS: Illumina paired-end (PE RNA-Sequencing was performed, and generated 48.7 million of 75 bp PE reads. These reads were de novo assembled into 128,052 transcripts (≥ 100 bp, which correspond to 41.1 million base pairs, by using a combined assembly strategy. Transcripts were annotated by Blast2GO and 51,763 transcripts got BLASTX hits, in which 39,677 transcripts have GO terms and 14,117 have ECs that are associated with 147 KEGG pathways. Furthermore, transcriptome differences of seven tissues were analyzed by using Illumina digital gene expression (DGE tag profiling and numerous differentially and specifically expressed transcripts were identified. Moreover, the expression characteristics of genes involved in viral genomes, starch metabolism and potential stress tolerance and insect resistance were also identified. CONCLUSIONS/SIGNIFICANCE: The combined de novo transcriptome assembly strategy can be applied to other organisms whose reference genomes are not available. The data provided here represent the most comprehensive and integrated genomic resources for cloning and identifying genes of interest in sweet potato. Characterization of sweet potato transcriptome provides an effective tool for better understanding the molecular mechanisms of cellular processes including development of leaves and storage roots

  14. On the origin of sweet potato (Ipomoea batatas (L.) Lam.) genetic diversity in New Guinea, a secondary centre of diversity.

    Science.gov (United States)

    Roullier, C; Kambouo, R; Paofa, J; McKey, D; Lebot, V

    2013-06-01

    New Guinea is considered the most important secondary centre of diversity for sweet potato (Ipomoea batatas). We analysed nuclear and chloroplast genetic diversity of 417 New Guinea sweet potato landraces, representing agro-morphological diversity collected throughout the island, and compared this diversity with that in tropical America. The molecular data reveal moderate diversity across all accessions analysed, lower than that found in tropical America. Nuclear data confirm previous results, suggesting that New Guinea landraces are principally derived from the Northern neotropical genepool (Camote and Batata lines, from the Caribbean and Central America). However, chloroplast data suggest that South American clones (early Kumara line clones or, more probably, later reintroductions) were also introduced into New Guinea and then recombined with existing genotypes. The frequency distribution of pairwise distances between New Guinea landraces suggests that sexual reproduction, rather than somaclonal variation, has played a predominant role in the diversification of sweet potato. The frequent incorporation of plants issued from true seed by farmers, and the geographical and cultural barriers constraining crop diffusion in this topographically and linguistically heterogeneous island, has led to the accumulation of an impressive number of variants. As the diversification of sweet potato in New Guinea is primarily the result of farmers' management of the reproductive biology of their crop, we argue that on-farm conservation programmes that implement distribution of core samples (clones representing the useful diversity of the species) and promote on-farm selection of locally adapted variants may allow local communities to fashion relatively autonomous strategies for coping with ongoing global change.

  15. Fermentation by amylolytic lactic acid bacteria and consequences for starch digestibility of plantain, breadfruit, and sweet potato flours

    OpenAIRE

    Haydersah, J.; Chevallier, I.; Rochette, Isabelle; Mouquet Rivier, Claire; Picq, Christian; Marianne Pépin, T.; Icard-Vernière, Christèle; Guyot, Jean-Pierre

    2012-01-01

    The potential of tropical starchy plants such as plantain (Musa paradisiaca), breadfruit (Artocarpus communis), and sweet potato (Ipomoea batatas) for the development of new fermented foods was investigated by exploiting the capacity of some lactic acid bacteria to hydrolyze starch. The amylolytic lactic acid bacteria (ALAB) Lactobacillus plantarum A6 and Lactobacillus fermentum Ogi E1 were able to change the consistency of thick sticky gelatinized slurries of these starchy fruits and tubers ...

  16. Modeling of mass transfer performance of hot-air drying of sweet potato (Ipomoea Batatas L. slices

    Directory of Open Access Journals (Sweden)

    Zhu Aishi

    2014-01-01

    Full Text Available In order to investigate the transfer characteristics of the sweet potato drying process, a laboratory convective hot air dryer was applied to study the influences of drying temperature, hot air velocity and thickness of sweet potato slice on the drying process. The experimental data of moisture ratio of sweet potato slices were used to fit the mathematical models, and the effective diffusion coefficients were calculated. The result showed that temperature, velocity and thickness influenced the drying process significantly. The Logarithmic model showed the best fit to experimental drying data for temperature and the Wang and Singh model were found to be the most satisfactory for velocity and thickness. It was also found that, with the increase of temperature from 60 to 80°C, the effective moisture diffusion coefficient varied from 2.962×10-10 to 4.694×10-10 m2×s-1, and it fitted the Arrhenius equation, the activation energy was 23.29 kJ×mol-1; with the increase of hot air velocity from 0.423 to 1.120 m×s-1, the values of effective moisture diffusion coefficient varied from 2.877×10-10 to 3.760×10-10 m2•s-1; with the increase of thickness of sweet potato slice from 0.002 m to 0.004 m, the values of effective moisture diffusion coefficient varied from 3.887×10-10 to 1.225×10-9 m2•s-1.

  17. Relationship between Processing Method and the Glycemic Indices of Ten Sweet Potato (Ipomoea batatas Cultivars Commonly Consumed in Jamaica

    Directory of Open Access Journals (Sweden)

    Perceval S. Bahado-Singh

    2011-01-01

    Full Text Available This study investigated the effect of different traditional cooking methods on glycemic index (GI and glycemic response of ten Sweet potato (Ipomoea batatas cultivars commonly eaten in Jamaica. Matured tubers were cooked by roasting, baking, frying, or boiling then immediately consumed by the ten nondiabetic test subjects (5 males and 5 females; mean age of 27 ± 2 years. The GI varied between 41 ± 5–93 ± 5 for the tubers studied. Samples prepared by boiling had the lowest GI (41 ± 5–50 ± 3, while those processed by baking (82 ± 3–94 ± 3 and roasting (79 ± 4–93 ± 2 had the highest GI values. The study indicates that the glycemic index of Jamaican sweet potatoes varies significantly with the method of preparation and to a lesser extent on intravarietal differences. Consumption of boiled sweet potatoes could minimize postprandial blood glucose spikes and therefore, may prove to be more efficacious in the management of type 2 diabetes mellitus.

  18. Digestion performance and microbial community in full-scale methane fermentation of stillage from sweet potato-shochu production.

    Science.gov (United States)

    Kobayashi, Tsutomu; Tang, Yueqin; Urakami, Toyoshi; Morimura, Shigeru; Kida, Kenji

    2014-02-01

    Sweet potato shochu is a traditional Japanese spirit produced mainly in the South Kyushu area in Japan. The amount of stillage reaches approximately 8 x 10(5) tons per year. Wastewater mainly containing stillage from the production of sweet potato-shochu was treated thermophilically in a full-scale treatment plant using fixed-bed reactors (8 reactors x 283 m3). Following the addition of Ni2+ and Co2+, the reactors have been stably operated for six years at a high chemical oxygen demand (COD) loading rate of 14 kg/(m3 x day). Analysis of coenzyme content and microbial communities indicated that similar microbial communities were present in the liquid phase and on the fiber carriers installed in reactors. Bacteria in the phyla Firmicutes as well as Bacteroidetes were dominant bacteria, and Methanosarcina thermophila as well as Methanothermobacter crinale were dominant methanogens in the reactors. This study reveals that stillage from sweet potato-shochu production can be treated effectively in a full-scale fixed-bed reactor under thermophilic conditions with the help of Ni2+ and Co2+. The high diversity of bacterial community and the coexistence of both aceticlastic and hydrogenotrophic methanogens contributed to the excellent fermentation performance.

  19. Rheological and functional properties of composite sweet potato - wheat dough as affected by transglutaminase and ascorbic acid.

    Science.gov (United States)

    Ndayishimiye, Jean Bernard; Huang, Wei-Ning; Wang, Feng; Chen, Yong-Zheng; Letsididi, Rebaone; Rayas-Duarte, Patricia; Ndahetuye, Jean Baptiste; Tang, Xiao-Juan

    2016-02-01

    Effect of transglutaminase (TGM) and ascorbic acid (AA) on composite sweet potato - wheat dough functional and rheological properties was studied. Partial substitution of wheat flour with sweet potato flour at the level of 20 % significantly (P ≤ 0.05) reduced glutenin, gliadin, dough stability, protein weakening, storage modulus (G') and viscous modulus (G″). Mixolab revealed that both TGM and AA treated dough had stability and protein weakening closed to wheat dough (control), with TGM treated dough having the highest values. TGM Introduced new cross-link bonds as shown by the change of amino acid concentration, leading to an increase in storage modulus (G') and viscous modulus (G″), with G' being higher at all levels of TGM concentration. The opposite was observed for composite dough treated with AA as measured by controlled - stress rheometer. TGM treatment increased glutenin and gliadin content. Compared with the control, dough treated with AA exhibited high molecular weight of polymers than TGM treated dough. The results indicate that the TGM and AA modification of the mixolab and dynamic rheological characteristics (G' and G″) dependent on the changes of GMP, glutenin, gliadin and protein weakening in the composite dough. TGM and AA treatment could improve functional and rheological properties of sweet potato - wheat dough to levels that might be achieved with normal wheat bread. However, it's extremely important to optimize the concentrations of both additives to obtain the optimum response.

  20. KARAKTERISTIK FISIKO-KIMIA TEPUNG UBI JALAR (Ipomoea batatas VARIETAS SUKUH DENGAN VARIASI PROSES PENEPUNGAN [Physico-Chemical Characteristics of Sukuh Variety Sweet Potatoes (Ipomea batatas Flours Made with Various Methods

    Directory of Open Access Journals (Sweden)

    Trifena Honestin

    2009-12-01

    Full Text Available Sweet potato has considerable potencies to support food diversification program based on flour and starch product. Various processing methods in the flour processing show great effect on alteration of the physicochemical properties of sweet potato flour. This research investigated the effects of different flour processing methods on the physicochemical properties of sweet potato flour. The results showed that processing method had a significant effect on water content, bulk density, colour (L, a, b, microscopic properties of starch granule, water absorption index, water soluble index and pasting properties of the sweet potato flour.

  1. Ultrasound treated potato peel and sweet lime pomace based biopolymer film development.

    Science.gov (United States)

    Borah, Purba Prasad; Das, Pulak; Badwaik, Laxmikant S

    2017-05-01

    Treatment and management of food processing waste is a major challenge for food industry. Potato processing industry generates tremendous amount of peel and consider it as zero valued waste. Again, pomace generated after juice extraction from sweet lime pulp is considered as waste and not properly utilized. Whereas these waste could be utilized for the development of biodegradable packaging film to overcome environmental issues. Composite films were prepared with varying proportion of potato peel powder (PP) and sweet lime pomace (SLP) in the ratio of 0:1(A), 0.5:1(B), 1:1(C), 1:0.5(D), 1:0(E) with an ultrasound treatment of 45min, and 0:1(F), 0.5:1(G), 1:1(H), 1:0.5(I), 1:0(J) with an ultrasound treatment of 60min. Ultrasound was applied for 45 and 60min to film forming solutions to break down biopolymer particles small enough to form a film. All the films were analyzed for their barrier and mechanical properties. It was observed that increasing ultrasound treatment times gives better result in film properties and less PP content also gives better film properties, from these observations film G prepared with 0.5:1 (PP:SLP) showed better characteristics among all other films. Water vapor permeability, moisture absorption, water solubility, breakage strength and elongation capacity of G film were reported as 7.25×10(-9)g/Pahm, 12.88±0.348%, 38.92±0.702%, 242.01±3.074g and 7.61±0.824mm respectively. However, thermal decomposition for film G took place above 200°C. The film forming solution of selected G film, added with clove essential oil (1.5%) as an antimicrobial agent was wrapped on bread and stored it for 5days. The film was successful in lowering the weight loss, reducing the hardness and inhibition of surface microbial load from bread sample.

  2. Development and Identification of SSR Markers Associated with Starch Properties and β-Carotene Content in the Storage Root of Sweet Potato (Ipomoea batatas L.)

    Science.gov (United States)

    Zhang, Kai; Wu, Zhengdan; Tang, Daobin; Lv, Changwen; Luo, Kai; Zhao, Yong; Liu, Xun; Huang, Yuanxin; Wang, Jichun

    2016-01-01

    Sweet potato (Ipomoea batatas L.) is a nutritious food crop and, based on the high starch content of its storage root, a potential bioethanol feedstock. Enhancing the nutritional value and starch quantity of storage roots are important goals of sweet potato breeding programs aimed at developing improved varieties for direct consumption, processing, and industrial uses. However, developing improved lines of sweet potato is challenging due to the genetic complexity of this plant and the lack of genome information. Short sequence repeat (SSR) markers are powerful molecular tools for tracking important loci in crops and for molecular-based breeding strategies; however, few SSR markers and marker-trait associations have hitherto been identified in sweet potato. In this study, we identified 1824 SSRs by using a de novo assembly of publicly available ESTs and mRNAs in sweet potato, and designed 1476 primer pairs based on SSR-containing sequences. We mapped 214 pairs of primers in a natural population comprised of 239 germplasms, and identified 1278 alleles with an average of 5.972 alleles per locus and a major allele frequency of 0.7702. Population structure analysis revealed two subpopulations in this panel of germplasms, and phenotypic characterization demonstrated that this panel is suitable for association mapping of starch-related traits. We identified 32, 16, and 17 SSR markers associated with starch content, β-carotene content, and starch composition in the storage root, respectively, using association analysis and further evaluation of a subset of sweet potato genotypes with various characteristics. The SSR markers identified here can be used to select varieties with desired traits and to investigate the genetic mechanism underlying starch and carotenoid formation in the starchy roots of sweet potato. PMID:26973669

  3. Purification and Trypsin Inhibitor Activity of a Sporamin B from Sweet Potato (Ipomoea batatas Lam. 55-2)

    Institute of Scientific and Technical Information of China (English)

    SUN Yan-li; SUN Jun-mao; LI Qing-peng

    2009-01-01

    Sporamin is a soluble protein in sweet potato, and falls into two distinct homology groups, subfamilies A and B. In this research, a sporamin B was purified and its amino acid sequences, trypsin inhibitor activity (Ti activity) were analyzed. This sporamin B was isolated from sweet potato tubers [Ipomoea batatas (L.) Lam cv. 55-2] through extraction of the water-soluble fraction, dialysis, ultrafiltration and ion-exchange chromatography. Homology determined by polyacrylamide gel electrophoresis showed that mainly one bond appeared in gel after being reduced by SDS (sodium dodecyl sulfate), or by SDS and 2-mercaptoethanol, or in native situation. By comparing the data of the polypeptide mass Matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry with those of the mass of the theoretical amino acid sequences from NCBI protein database, it was revealed that it was Q40091|Q40091_IPOBA, sweet potato sporamin B - Ipomoea Batatas (sweet potato) (Batate). The sequence coverage was 70.6%. N-terminal sequence was SETPV (Ser-Glu-Thr-Pro-Val). There is a linear relationship between trypsin inhibitor activity (Ti activity) and amounts of this sporamin B (3-18 μg mL-1). The equation of linear regression was y=2.5809x+17.049 (r2=0.9966). There was a curvilinear relationship between Ti activity and amounts of this sporamin B (21-150 μg mL-1). The equation of curvilinear regression is y= 14.4171n(x)+23.26 (r2=0.9924). The concentration of sporamin B with Ti activity after heating at 40℃ may induce part denature of this sporamin B, and there was no statistic difference after heating at 40, 50, 60℃ for 20 min. Heat treatment at more than 90℃ leads to a dramatic decrease of trypsin inhibitor efficiency. The results suggested that Q40091|Q40091_IPOBA was the major sporamin B in sweet potato tubers [Ipomoea Batatas (L.) Lain cv. 55-2], which had strong Ti activity, and was stable to both thermal and DTT (DL-dithiothreitol) relatively.

  4. The Photosynthesis Study of Hydroponic Sweet-potato%水培甘薯的光合研究

    Institute of Scientific and Technical Information of China (English)

    张玉娟; 周全卢; 李育明; 何素兰; 王梅

    2011-01-01

    使用LI-6400便携式光合测定系统对三种水培甘薯食用型'南薯88'、兼用型'徐薯18'和特用型‘南紫薯008'的光合进行了测定,利用非直角双曲线模型对三种甘薯品种的光合作用生理参数进行拟合.结果表明,不同类型甘薯品种的光响应曲线的特征参数存在着差异,食用品种‘南薯88'的光和潜力最强,可在高密度栽培下发挥群体优势达到高产;兼用型品种‘徐薯18'对光的适应性次之,在较高密度栽培下能发挥群体优势;特用型品种‘南紫薯008'的光合潜力和对光的适应性均最弱,但对弱光的利用率最高,最适合于间套作.不同类型甘薯品种间的生理指标存在相似的变化,气孔导度和蒸腾速率对净光合速率的影响达极显著正相关,胞间CO2浓度对甘薯净光合速率的影响呈极显著负相关,揭示了不同类型甘薯品种在光能利用上的差异.‘南紫薯008'在较低光强下能很快使气孔打开,蒸腾速率也快速增加.从而使光合速率也加强.在高光强下,‘南薯88'的气孔导度、胞间CO2浓度值最大,这可能是‘南薯88'光合速率高的原因.为田间甘薯的共性和特异性研究提供了一定的理论基础.%Using LI-6400 photosynthetic analyzer to measure NFT sweet-potato, edible sweet potato 'Nanshu 88', dual-purpose sweet potato 'Xushu 18', special using of sweet potato 'Nanzishu 008', and using the angle hyperbolic model to fitting the photosynthesis physical parameters of three kinds of sweet potato.The results showed as following: There were differences in light response curve characteristic parameters of different types of sweet potato.It was the highest photosynthesis potential in edible type sweet potato ('Nanshu 88'), and appropriate high-density community superiority to reach high yield.'Xushu 18' had higher adaptability to illumination and appropriate higher density community superiority to reach high yield.'Nanzishu 008'photosynthetic

  5. Applying insecticides through drip irrigation to reduce wireworm (Coleoptera: Elateridae) feeding damage in sweet potato.

    Science.gov (United States)

    Arrington, Amber E; Kennedy, George G; Abney, Mark R

    2016-06-01

    A 2 year field study was conducted at multiple locations to determine whether insecticides or an entomopathogenic nematode, Steinernema carpocapsae Weiser, applied through drip irrigation in sweet potato reduced wireworm damage when compared with the non-treated check and/or insecticides applied conventionally. Wireworm damage was low in 2012, and there were no differences in the proportion of roots damaged or the severity of damage between treatments. In 2013, a preplant-incorporated (PPI) application of chlorpyrifos followed by either bifenthrin, imidacloprid, clothianidin, or oxamyl injected through drip irrigation significantly reduced the proportion of wireworm damage as well as the severity of wireworm damage when compared with the non-treated check. The incidence and severity of wireworm damage in these treatments did not differ significantly from those in the conventional management practice. The PPI application of chlorpyrifos followed by either cyantraniliprole or S. carpocapsae injected through drip irrigation was not significantly different from the non-treated check in the proportion of wireworm damage; however, both treatments reduced the severity of wireworm damage compared with the non-treated check. Applying insecticides through drip irrigation provides an alternative to conventionally applied insecticides. © 2015 Society of Chemical Industry. © 2015 Society of Chemical Industry.

  6. A Microwave-Sensitive Solid Acid Catalyst Prepared from Sweet Potato via a Simple Method

    Directory of Open Access Journals (Sweden)

    Hai-Ying Chen

    2016-12-01

    Full Text Available In this study, a microwave-sensitive solid acid catalyst was successfully synthesized from sweet potatoes via a simple process. The catalyst was proven to have superior microwave-sensitive and homogeneous properties. The physicochemical properties were characterized by Brunauer–Emmett–Teller (BET, X-ray diffraction (XRD, Fourier-transform infrared spectra (FT-IR, thermogravimetric (TGA, scanning electron microscope (SEM and elemental analysis (EA. Results showed that the total acid density and specific surface area for the catalyst were 6.35 mmol/g and 78.35 m2/g, respectively. The elemental sulfur content reached 7.449% after sulfonation and the catalytic activity could reach over 91% within 30 min with microwave power density of 1.0 W/mL. The catalytic reaction temperature should not exceed 200 °C, as shown in TGA curve, and the moisture content in the oil raw material should be within 1%–2%. The catalyst deactivated gradually to 64.38% after reutilization five times, but the catalytic activity could be simply regenerated by re-sulfonation, albeit slightly reduced (87.56%. The shift of diffraction peaks in the XRD patterns and new absorption peaks at 619.98 and 1190.49 cm−1 of FT-IR spectra demonstrated that the –SO3H group was effectively attached to the catalyst. The SEM images displayed a loose and porous amorphous structure in the end catalyst.

  7. Estabilidade de farinha de batata-doce biofortificada Stability of biofortified sweet potato flour

    Directory of Open Access Journals (Sweden)

    Rosa Maria Vercelino Alves

    2012-03-01

    -doce biofortificada.Sweet potato flour, when made from roots with high β-carotene contents, is a source of pro-vitamin A, presenting beneficial effects for human health. Thus aiming at contributing to the supply of vitamin A in the diet of more needy populations, EMBRAPA has selected and improved some crops via biofortification, such as the sweet potato, and developed products with the biofortified raw material. Complementing these developments, the purpose of this study was to correlate the effect of the type of package and packaging system on the product, in the preservation of the carotenoids in the biofortified sweet potato flour. The flour was packed with and without vacuum in packs with different oxygen, water vapour and light barriers (PET/Al/LDPE, PETmet/LDPE, LDPE/PA/LDPE and LDPE and stored at 25 °C/75%RH with and without exposure to light. Losses of 50% of the total carotenoids and β-carotene occurred in the flour packed in PETmet/LDPE and LDPE without vacuum after 50 days of storage, due to the residual oxygen in the headspace and the high oxygen transmission rate in the case of LDPE, where the internal atmosphere showed the composition of air throughout the study. Losses of 50% carotenoids occurred after 90 days with and without exposure to light in the flour packed in LDPE/PA/LDPE with vacuum, indicating that in the presence of light, the carotenoid oxidation reaction is restricted to flour in contact with the surface of the package. Under vacuum and packed in PETmet/LDPE, the carotenoid contents of the flour reduced slightly, but were preserved for up to 360 days of storage when packed in PET/Al/LDPE. The results indicate that the key factors to preserve carotenoids in biofortified sweet potato flour are the reduction of the oxygen level in the headspace of the package by the application of vacuum, together with the use of packaging materials with an oxygen barrier as good as that of PET with a metalized barrier.

  8. Characterization and Expression Analysis of Starch Branching Enzymes in Sweet Potato

    Institute of Scientific and Technical Information of China (English)

    QIN Hua; ZHOU Shuang; ZHANG Yi-zheng

    2013-01-01

    Spatial and temporal expression patterns of Sbe1 and Sbe2 that encode starch branching enzyme (SBE) I and II, respectively, in sweet potato (Ipomoea batatas L.) were analyzed. Expression of both genes in Escherichia coli indicate that both genes encoded active SBE. Analysis with real-time quantitative polymerase chain reaction technique indicates that IbSbe1 mRNA was expressed at very low levels in leaves but was the predominant isoform in tuberous root while the reverse case was found for IbSbe2. The expression pattern of IbSbe1, closely resembles that of AGPase S, a gene coding for one of the subunits of ADP-glucose pyrophosphorylase, which is the key regulatory enzyme in the starch biosynthetic pathway. Western analysis detected at least two isoforms of SBE I in tuberous roots, those two isoforms showed adverse expression patterns with the development of the tuberous roots. Expression of the two IbSbe genes exhibited a diurnal rhythm during a 12-h cycle when fed a continuous solution of sucrose. Abscisic acid (ABA) was aother potent inducer of IbSbe expression, but bypassed the semidian oscillator.

  9. Effects of high hydrostatic pressure on secondary structure and emulsifying behavior of sweet potato protein

    Science.gov (United States)

    Mehmood Khan, Nasir; Mu, Tai-Hua; Sun, Hong-Nan; Zhang, Miao; Chen, Jing-Wang

    2015-04-01

    In this study, secondary structures of sweet potato protein (SPP) after high hydrostatic pressure (HHP) treatment (200-600 MPa) were evaluated and emulsifying properties of emulsions with HHP-treated SPP solutions in different pH values (3, 6, and 9) were investigated. Circular dichroism analysis confirmed the modification of the SPP secondary structure. Surface hydrophobicity increased at pH 3 and decreased at 6 and 9. Emulsifying activity index at pH 6 increased with an increase in pressure, whereas emulsifying stability index increased at pH 6 and 9. Oil droplet sizes decreased, while volume frequency distribution of the smaller droplets increased at pH 3 and 6 with the HHP treatment. Emulsion viscosity increased at pH 6 and 9 and pseudo-plastic flow behaviors were not altered for all emulsions produced with HHP-treated SPP. These results suggested that HHP could modify the SPP structure for better emulsifying properties, which could increase the use of SPP emulsion in the food industry.

  10. Bioconversion of wastewater from sweet potato starch production to Paenibacillus polymyxa biofertilizer for tea plants.

    Science.gov (United States)

    Xu, Shengjun; Bai, Zhihui; Jin, Bo; Xiao, Runlin; Zhuang, Guoqiang

    2014-02-28

    Wastewater from the sweet potato starch industry is a large source of nutrient-rich substrates. We assessed whether this wastewater could be used to produce Paenibacillus polymyxa biofertilizer for foliar application to tea trees. Using the central composite design methods we experientially determined that the optimal culture conditions for P. polymyxa were pH, 6.5; temperature, 29.0 °C; and incubation time, 16 h. Under these conditions, a maximum biomass of 9.7 × 10(9) cfu/mL was achieved. We then conducted a yearlong field investigation to determine the effect of P. polymyxa biofertilizer on the growth of tea plants (Camellia sinensis). Tea yield, quantity of water extract, and tea polyphenol levels were significantly higher after foliar application of the biofertilizer compared to that in the controls by an average of 16.7%, 6.3%, and 10.4%, respectively. This approach appears to be technically feasible for organic tea production, and is an environmentally friendly way to utilize wastewater.

  11. Study on Soaking Technology in Improving Extraction Rate of Sweet Potato Starch%提高红薯淀粉得率的浸泡工艺研究

    Institute of Scientific and Technical Information of China (English)

    王家良; 陈光远; 王改玲

    2011-01-01

    为提高红薯淀粉的得率,对红薯淀粉生产过程中的不同浸渍工艺进行了研究.通过单因素试验和正交试验确定红薯干先粉碎,再浸泡的较佳工艺条件为:红薯干粉碎粒度60~100目、石灰乳用量0.05%、浸泡时间8h、浸泡温度25℃时,红薯淀粉的得率在75%左右.将红薯干直接浸泡较佳的工艺条件为:石灰乳用量0.06%、浸泡时间10 h、浸泡温度30℃时,红薯淀粉的得率在73%左右.2种工艺比较而言,将红薯干粉碎后提取淀粉,其工艺条件易于控制、提取时间缩短2h,且得率比红薯干直接浸泡提取淀粉得率提高2%.%To improve the extraction rate of sweet potato starch, the different soak technology in the production process of sweet potato starch was studied. The processing technology for extract sweet potato starch by first crush and then soaking was optimized by single - factor experiments and orthogonal experiments. The results showed that the particle size was 60 ~ 100 meshes; the dosage of lime milk was 0. 05% ; soak time was 8 h; soak temperature was 25 t ,and sweet potato starch yield was 75% or so. The optimum technology was to soak dried sweet potato as follows; the dosage of lime milk was 0.06% ;soak time was 10 h;soak temperature was 30 t, and sweet potato starch yield was 73% or so. In comparison, the production process of sweet potato starch of first crush and then soaking was easy to control with the extraction time shortened for 2 h and the rate of extraction 2% higher than the direct soaking of dried sweet potato. In order to provide a pilot basis for the industrial production of sweet potato starch.

  12. The Influence of Oligosaccharides on Properties of Sweet Potato Starch%低聚糖对红薯淀粉性质的影响

    Institute of Scientific and Technical Information of China (English)

    李飞; 陈梦雪; 胡雅婕; 李光磊; 曾洁

    2015-01-01

    向红薯淀粉中添加不同种类及添加量的低聚糖,测定淀粉粘度、碘蓝值、凝沉性,以此来研究低聚糖对红薯淀粉性质的影响。结果表明:添加不同种类、不同量的低聚糖对红薯淀粉的粘度、碘蓝值、凝沉性有较大影响;麦芽糖对红薯淀粉的热稳定性和碘蓝值影响最大,低聚木糖对红薯淀粉的凝沉性影响最大。%To add oligosaccharides of different types and amount in sweet potato starch for determining starch viscosity, starch iodine blue value and retrogradation in order to study the influence of oligosaccharides on sweet potato starch properties. The result showed that adding different types and different amount oligosaccharides had big influence on starch viscosity, starch iodine blue value and retrogra-dation of sweet potato starch;maltose had the biggest influence on thermal stability and starch iodine blue value of sweet potato starch, xylo oligosaccharides had the biggest influence on retrogradation of sweet potato starch.

  13. Microbial growth and sensory quality of dried potato slices irradiated by electrons

    Science.gov (United States)

    Kim, Hyun-Jin; Song, Hyeon-Jeong; Song, Kyung-Bin

    2011-06-01

    Electron beam irradiation was applied to secure the microbial safety of dried purple sweet potato. After purple sweet potato slices had been dehydrated with 20% (w/w) maltodextrin solution, the samples were irradiated at doses 2, 4, 6, 8, and 10 kGy and then stored at 20 °C for 60 days. Microbiological data indicated that the populations of total aerobic bacteria and of yeast and molds significantly decreased with increase in irradiation dosage. Specifically, microbial load was reduced by about three log cycles at 6 kGy compared to those of the control. Based on the color measurement of the potato slices, electron beam irradiation treatment did not affect the color quality. Sensory evaluation results also showed that electron beam irradiation did not affect overall sensory scores during storage. These results suggest that electron beam irradiation could be useful for improving microbial safety without impairing the quality of the potato slices during storage.

  14. Microbial growth and sensory quality of dried potato slices irradiated by electrons

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Hyun-Jin; Song, Hyeon-Jeong [Department of Food Science and Technology, Chungnam National University, Daejeon 305-764 (Korea, Republic of); Song, Kyung-Bin, E-mail: kbsong@cnu.ac.k [Department of Food Science and Technology, Chungnam National University, Daejeon 305-764 (Korea, Republic of)

    2011-06-15

    Electron beam irradiation was applied to secure the microbial safety of dried purple sweet potato. After purple sweet potato slices had been dehydrated with 20% (w/w) maltodextrin solution, the samples were irradiated at doses 2, 4, 6, 8, and 10 kGy and then stored at 20 {sup o}C for 60 days. Microbiological data indicated that the populations of total aerobic bacteria and of yeast and molds significantly decreased with increase in irradiation dosage. Specifically, microbial load was reduced by about three log cycles at 6 kGy compared to those of the control. Based on the color measurement of the potato slices, electron beam irradiation treatment did not affect the color quality. Sensory evaluation results also showed that electron beam irradiation did not affect overall sensory scores during storage. These results suggest that electron beam irradiation could be useful for improving microbial safety without impairing the quality of the potato slices during storage.

  15. Effect of preozonation on improvement of settleability of solid in highly concentrated organic wastewater of Japanese wheat and sweet potato spirit-distillery

    Institute of Scientific and Technical Information of China (English)

    Masafumi Tateda; Masanori Fujita; Michihiko Ike; QUI Yen-feng; Satoru Kokubo

    2004-01-01

    Solid-liquid separation of the wastewater is very difficult because of high viscosity and high SSconcentration. In this study, the effectiveness of preozonation on improving the settleability of the solids in wheatand sweet potato wastewaters was investigated using a bench-scale system and pilot treatment system respectively.Results showed that solid-liquid separation in the wheat wastewater was greatly improved by the decanter in thesystem(SS reduction from 24100 mg/L to 100 mg/L). However, preozonation practice did not show a significanteffect on solid-liquid separation of the sweet potato wastewater. Effect of preozonation on solid-liquid separationbetween wheat and sweet potato wastewater showed different.

  16. Mercury content of sprouts and harvested roots from treated sweet potato mother roots. [Ipomoea batatas

    Energy Technology Data Exchange (ETDEWEB)

    Huisingh, D.; Nielsen, L.W.

    1972-01-01

    Mercury containing fungicides have been used extensively for seed and root disease control, but data on the fate of the mercury (Hg) are scarce. Experiments were designed to see if Hg applied to propagative sweet potato roots increased the Hg-content of edible roots. Roots were treated with Semesan Bel(hydroxymercurinitrophenol + hydroxymercurichlorophenol), Mertect (Thiabendazole: 2-(4-Thiazolyl)-benzimidazole), or Botran (2,6-Dichloro-4-nitroanaline) at recommended rates or with water. Treated roots were bedded into sandy loam soil, and the plants were harvested at 2 and 3 months after bedding. Some sprouts transplanted at 2 months were grown to maturity, and the harvested roots were analyzed. Hg analyses were performed by flameless atomic absorption. Roots treated prior to planting with Semesan Bel, Mertect, Botran, and water contained 23.0, 0.05, 0.03 and 0.03 ..mu..g/g dry wt, respectively. At the 2-month harvest, the leaves and stems of the Semesan Bel-treated plants contained 5 times more Hg than those of the other treatments. By the 3-month harvest, the amount of Hg in plant leaves and stems from Hg-treated roots was 2 to 3 times that of the others. Fall harvested fleshy roots contained 0.03, 0.02, 0.03, and 0.03 ..mu..g/g dry wt Hg for the Semesan Bel, Mertect, Botran, and water treatments, respectively. This demonstrates that the Hg applied to the mother root was translocated to the new plant, but little if any was translocated to the new fleshy roots.

  17. Quality improvement of sweet-potato (Ipomoea batatas L. Lam.) roots as feed by ensilage.

    Science.gov (United States)

    Lin, Y H; Huang, T C; Huang, C

    1988-07-01

    1. Sweet-potato (Ipomoea batatas L. Lam.) strips (SPS) mixed with maize powder (CP) in proportions 10:0, 9:1, 8:2, and 7:3 were ensiled for 1, 2 or 3 months. 2. Trypsin inhibitor activity (TIA) decreased during ensilage in samples of all treatments while the SPS-CP mixture (7:3, w/w) ensiled for 3 months contained the lowest TIA. 3. SPS-CP (8:2, w/w) dried or ensiled for 2 months, or ensiled for 2 months and dried, were each mixed with twice the amount of control diet (1:2, w/w) to make three diets. These three diets together with the control diet were used for a feeding experiment with rats to evaluate the nutritive value. 4. General composition analysis (including metabolizable energy), fatty acid composition and amino acid analysis (including percentage of essential amino acids) of the samples did not change during ensilage to an extent which could explain the improved performance of rats fed on ensiled diets. 5. Rats fed on diets containing dried SPS-CP (8:2, w/w) showed significantly lower (P less than 0.05) body-weight gain than rats fed on the control diet or ensiled SPS diets, at the end of the 8th week. They also showed enlargement of the pancreas. The adverse effect of SPS was associated with TIA which seemed to be prevented to some extent by ensilage. 6. The possibility that the starch of SPS may also contribute to the adverse effect cannot be excluded at present.

  18. The Production of Itaconic Acid from Sweet Potato Peel Using Aspergillus niger and Aspergillus terreus

    Directory of Open Access Journals (Sweden)

    OMOJASOLA PATRICIA FOLAKEMI

    2014-12-01

    Full Text Available Accumulation of large quantities of agricultural residues results in deterioration of the environment and biomass loss which could be processed to yield value-added products like fuels and a variety of acids. The quest for a solution led to the fermentation of Ipomoea batatas using fungi. Aspergillus niger (ATCC 16404 and Aspergillus terreus (ATCC 20542 were used to ferment sweet potato peel (SPP, an agro-based waste. The physico-chemical analysis of the SPP was carried out. SPP was dried, ground, pre-treated with alkali and steam, re-dried and used as substrate in media containing mineral salt medium and inocula of A. niger and A. terreus. Fermentation was submerged at pH 5.0; 10% substrate concentration; 10 mL inocula size; temperature 250 C for five days with carboxylmethylcellulose (CMC as control. Optimization experiments were conducted by varying fermentation parameters. Results of physico-chemical analysis revealed carbohydrate 65.9%; sugars 22.60%; protein 5.38%; fibre 3.48%; fat 4.0% ash 4.02% and moisture 8.13%. Itaconic acid yield of 67.67+1.20 mg mL-1 and 70.67+2.60 mg mL-1 produced by A. niger and A. terreus from SPP respectively. The CMC yielded 3.00 +0.6 mg mL-1. Results of the optimization experiments showed higher yields of itaconic acid by A. niger and A. terreus to 112.67+5.20 mg mL-1 and 115.67+5.30 mg mL-1 from SPP respectively at pH 4.0; 10% substrate concentration; 5 mL inocula size on Day-5 of the fermentation. This represented an increase in product yield by both organisms and supports the potential use of this waste for the industrial production of itaconic acid.

  19. In vitro bioaccessibility of beta-carotene in orange fleshed sweet potato (Ipomoea batatas, Lam.).

    Science.gov (United States)

    Failla, Mark L; Thakkar, Sagar K; Kim, Jung Y

    2009-11-25

    Substitution of white with orange fleshed varieties of sweet potatoes (OFSP) was recently shown to alleviate vitamin A deficiency in children in Africa. However, the relationship between beta-carotene (BC) content of different cultivars of OFSP and its bioavailability is unknown. Here, we used the three phase (oral, gastric and small intestinal) in vitro digestion procedure to examine the bioaccessibility of BC from eight cultivars of boiled OFSP. All-trans BC (all-E-BC) was the only isomer of BC detected in raw roots for cultivars of OFSP with amounts ranging from 112 to 281 microg/g. Boiling OFSP decreased all-E-BC content by 11% with conversion to 13-cis BC (13-Z-BC). The efficiency of BC micellarization during simulated digestion of boiled OFSP was only 0.6-3%. Addition of soybean oil (2% vol/wt) to boiled OFSP prior to in vitro digestion more than doubled partitioning of all-E-BC in the micelle fraction for all cultivars. The relatively poor bioaccessibility of all-E-BC was not a limitation of the in vitro model as micellarization was proportional to amount of OFSP digested from 0.5 to 3.0 g and minimally altered by increasing bile salt content during small intestinal digestion. Moreover, micellarization of all-E-BC from boiled fresh OFSP and commercially processed OFSP was significantly less than from carrots processed identically. These results indicate the need for further efforts to elucidate the basis for relatively poor bioaccessibility of BC from OFSP.

  20. 甘薯加工过程酶促褐变及控制研究%Enzymatic Browning and Its Control During Sweet Potato Processing

    Institute of Scientific and Technical Information of China (English)

    姜绍通; 罗志刚; 郑志; 潘丽军

    2001-01-01

    甘薯加工过程中极易产生酶促褐变。应用分光光度法,研究了甘薯中多酚氧化酶(PPO)的特性及褐变的控制方法。结果表明,甘薯皮部的PPO活性和褐变强度是心部的2倍左右,在pH值为4.5时其活性较低。在甘薯淀粉生产过程中,结合去皮工艺,分别选择添加0.01%~0.05%柠檬酸或0.005%~0.01%抗坏血酸或0.05%~0.1%亚硫酸钠,均可有效控制PPO产生的褐变,提高甘薯淀粉的质量。%Enzymatic browning is formed easily in sweet potato processing. In this paper, the characteristics of Polyphenol Oxidase (PPO) from sweet potato and its control methods were studied by spectrophotometry. The results indicated that the activity and browning intensity of PPO from sweet potato peel was two times than those of internal tissue, and sweet potato had a lower PPO activity at pH 4.5. During sweet potato starch processing, the addition of 0.01%~0.05% citric acid or 0.005%~0.01% ascorbic acid or 0.05%~0.1% sodium sulfite, all combining with peeling sweet potato, would markedly inhibit the enzymatic browning caused by PPO, and improve the quality of starch.

  1. The potential of computer vision, optical backscattering parameters and artificial neural network modelling in monitoring the shrinkage of sweet potato (Ipomoea batatas L.) during drying.

    Science.gov (United States)

    Onwude, Daniel I; Hashim, Norhashila; Abdan, Khalina; Janius, Rimfiel; Chen, Guangnan

    2017-07-30

    Drying is a method used to preserve agricultural crops. During the drying of products with high moisture content, structural changes in shape, volume, area, density and porosity occur. These changes could affect the final quality of dried product and also the effective design of drying equipment. Therefore, this study investigated a novel approach in monitoring and predicting the shrinkage of sweet potato during drying. Drying experiments were conducted at temperatures of 50-70 °C and samples thicknesses of 2-6 mm. The volume and surface area obtained from camera vision, and the perimeter and illuminated area from backscattered optical images were analysed and used to evaluate the shrinkage of sweet potato during drying. The relationship between dimensionless moisture content and shrinkage of sweet potato in terms of volume, surface area, perimeter and illuminated area was found to be linearly correlated. The results also demonstrated that the shrinkage of sweet potato based on computer vision and backscattered optical parameters is affected by the product thickness, drying temperature and drying time. A multilayer perceptron (MLP) artificial neural network with input layer containing three cells, two hidden layers (18 neurons), and five cells for output layer, was used to develop a model that can monitor, control and predict the shrinkage parameters and moisture content of sweet potato slices under different drying conditions. The developed ANN model satisfactorily predicted the shrinkage and dimensionless moisture content of sweet potato with correlation coefficient greater than 0.95. Combined computer vision, laser light backscattering imaging and artificial neural network can be used as a non-destructive, rapid and easily adaptable technique for in-line monitoring, predicting and controlling the shrinkage and moisture changes of food and agricultural crops during drying. © 2017 Society of Chemical Industry. © 2017 Society of Chemical Industry.

  2. Effects of high hydrostatic pressure on emulsifying properties of sweet potato protein in model protein-hydrocolloids system.

    Science.gov (United States)

    Khan, Nasir Mehmood; Mu, Tai-Hua; Ali, Farman; Arogundade, Lawrence A; Khan, Zia Ullah; Zhang, Maio; Ahmad, Shujaat; Sun, Hong-Nan

    2015-02-15

    The effects of high hydrostatic pressure (HHP) on emulsifying properties of sweet potato protein (SPP) in presence of 0.1%, 0.3% and 0.5% (w/v) of guar gum (GG) and glycerol monostearate (GMS) were investigated. Emulsifying stability index (ESI) of the SPP with GG revealed significant increase (Pmodel while such case was not observed for SPP-GMS model. The flow index for SPP-GG emulsion model was found to decrease with increase in HHP treatment and had non-Newtonian behaviour. The SPP-GMS emulsion models with HHP treatments showed comparatively lower viscosities but had more Newtonian flow character.

  3. Effect of extrusion-cooking in total carotenoids content in cream and orange flesh sweet potato cultivars

    Directory of Open Access Journals (Sweden)

    Marcos José de O Fonseca

    2008-03-01

    Full Text Available Sweet potato (Ipomoea batatas is a food crop that supplies energy, minerals and vitamins C and B. Some cultivars are very rich in carotenoids (pro-vitamin A. In this study were evaluated and compared the total carotenoids content of two cultivars and the losses on the dehydrated extruded sweet potato flour. Samples from organic and conventional crops were analyzed, in the form of fresh and dehydrated extruded samples. Total carotenoids content of the fresh product, expressed on wet basis, was of 437 µg 100 g-1 for the cream cultivar and 10,12 µg 100 g-1 for the orange cultivar. After dehydration, losses of total carotenoids were of 41% and 38%, respectively. The fresh orange cultivar presented high total carotenoids content in comparison to the cream cultivar. The extruded orange sweet potato flour showed the lowest losses in total carotenoids. Therefore, the processed flour of orange sweet potato could be used to obtain pre-gelatinized extruded flour with high total carotenoids content.A batata-doce (Ipomoea batatas é um alimento fonte rico em energia, minerais, vitaminas C e B. Algumas cultivares são ricas em pró-vitamina A. O objetivo do presente trabalho foi avaliar e comparar o conteúdo de carotenóides totais em duas cultivares de batata-doce e determinar suas perdas na obtenção da farinha desidratada e processada por extrusão. Foram analisadas amostras de sistema de cultivo orgânico e convencional, tanto as frescas como as extrusadas desidratadas. O conteúdo de carotenóides totais do produto fresco, expressos em base úmida, foi de 437 µg 100 g-1 para a cultivar creme e de 10,120 µg 100g-1 para a cultivar alaranjada. Após o processo de desidratação das amostras, as perdas de carotenóides totais foram de 41% para a batata-doce creme e 38% para a alaranjada, respectivamente. Os resultados indicaram alto conteúdo de carotenóides totais para a cultivar alaranjada fresca, quando comparado com a cultivar creme. A amostra de

  4. Seletividade de trifluralin incorporado ao solo para batata-doce Selectivity of soil incorporated trifluralin for sweet potato

    Directory of Open Access Journals (Sweden)

    Domingos Antonio Monteiro

    1993-01-01

    Full Text Available No Estado de São Paulo, a batata-doce é cultivada em escala comercial como produto hortigranjeiro. Em vista das dificuldades para o controle manual e o mecanizado das plantas infestantes da cultura, há grande interesse pelo método químico desse controle. Com essa finalidade, tanto pelo baixo custo relativo como pelas facilidades técnicas de utilização, o trifluralin desperta a atenção dos agricultores. Para avaliar a seletividade do herbicida para essa cultura, foi realizado um experimento em vasos, com doses crescentes do produto, nas seguintes concentrações: 0,00; 0,11; 0,22; 0,44; 0,88; 1,76 e 3,52 mg.kg-1 de i.a. em peso. Os resultados mostraram que, a partir da dose de 0,22 mg.kg-1 de i.a., o trifluralin interferiu negativamente e em escala exponencial sobre os parâmetros: comprimento das ramas, número de folhas, peso da massa seca da parte aérea e das raízes, avaliados aos 30 dias, revelando-se não seletivo para a batata-doce quando incorporado ao solo, em profundidades semelhantes às da zona de enraizamento das plantas.In the State of São Paulo, Brazil, sweet potato is nowadays a commercial vegetable crop. When labor is a limiting factor and the mechanical weed control is difficult, the chemical control is desirable. Trifluralin is an efficient herbicide for weed control in several crops. A green house experiment conducted at the Instituto Agronômico, Campinas, determined the selectivity of trifluralin in sweet potato. Increasing doses of trifluralin (0.00; 0.11; 0.22; 0.44; 0.88; 1.76 and 3.52 mg.kg-1 a.i. in weight were soil incorporated, uniformly. During thirty days, stem cuttings of sweet potatoes were grown in pots. The trial showed that no crop injury occurred by applying 0.11 mg.kg-1 a.i. An exponential injury has been observed at doses upper to 0.22 mg.kg-1 a.i. for the parameters analyzed: stem length, leaf number, dry weight of aerial parts and roots. Trifluralin incorporated in soil was a nonselective

  5. Effect of elevated CO/sub 2/ growth conditions on the nutritive composition and acceptability of baked sweet potatoes. [Iqomoea batatas

    Energy Technology Data Exchange (ETDEWEB)

    Lu, J.Y.; Biswas, P.K.; Pace, R.D.

    Georgia-Jet sweet potatoes were grown at CO/sub 2/ concentrations of 354, 431, 506, and 659 ppm for 90 days. Elevated CO/sub 2/ concentrations decreased protein, total carotenoids and insoluble dietary fiber. An increase in dry matter and a reddish-orange color was observed at 506 and 659 ppm CO/sub 2/ concentrations. Sensory evaluation scores for flavor and moistness indicated that sweet potatoes grown under high CO/sub 2/ concentrations were acceptable and not different from the control.

  6. 甘薯渣去除淀粉工艺研究%Study on technology of removing starch from sweet potato marc

    Institute of Scientific and Technical Information of China (English)

    梁新红; 孙俊良; 唐玉; 李元召

    2013-01-01

    甘薯渣中淀粉的存在严重影响了提取果胶的纯度,因此,开发和利用薯渣中的果胶资源,必须除去甘著渣中的淀粉甘著渣中淀粉去除的最佳工艺为固液比为1∶15,甘薯渣醪液pH6.0,经高温α-淀粉酶在90℃酶解30min;然后调整pH至4.5,依次加入糖化酶、普鲁兰酶,在60℃保温酶解180min,淀粉转化率较高,达到94.22%±3.43%.根据电镜图片可知,去除淀粉效果较好.因此,甘薯渣可以采用高温α-淀粉酶、糖化酶和普鲁兰酶复合酶制剂去除淀粉.研究对甘薯果胶开发中去除甘薯渣中淀粉的工艺具有理论及实践意义.%Starch in the sweet potato marc has seriously affected the purification of sweet potato pectin,and it must be removed from the sweet potato marc. The optimal parameters of removal starch were as follows:the ratio of the sweet potato marc and water 1:15,the sweet potato marc liquid pH6.0,temperature 90℃,reaction time 30min by high temperature a -amylase,and then pH4.5,60℃,time 180min by glucoamylase and pullulase.and the conversion of starch was 94.22% ±3.43% . According to the figure of scanning electron microscope,the starch in the sweet potato marc was successfully removed. Reseach showed that it had satisfactory effect to remove the starch from the sweet potato marc by use of high temperature a-amylase, glucoamylase and pullulase. The study was of significance to remove the starch in the sweet potato marc.

  7. Effect of Acetylation on the Properties of Sweet Potato Starch%乙酰化对红薯淀粉性质的影响

    Institute of Scientific and Technical Information of China (English)

    张磊; 熊柳; 孙庆杰

    2011-01-01

    The low-substituted acetylated sweet potato starches were prepared using sweet potato starch as raw material and acetic anhydride as the esterifying agent. Through the preparation of different degrees of substitution of acetylated sweet potato starches(DS = 0.044 -0.096), compared with the sweet potato native starch, the properties of acetylation and native sweet potato starches were studies such as the transparency, retrogradation, solubility, swelling, viscosity and texture properties. The results showed that acetylation significantly decreased retrogradation of sweet potato starches. The transparency, swelling power and solubility of acetylated sweet potato starches all increased with the increase in acetyl substitution degree. The gelatinization temperature of acetylated sweet potato starch were reduced 6-10 t. The final viscosity and retrogradation value were significantly lower. The hardness in texture properties decreased significantly.%以红薯淀粉为原料,醋酸酐为乙酰化剂,制备低取代的乙酰化红薯淀粉.通过制备不同取代度乙酰化淀粉(DS 0.044~0.096),与红薯原淀粉进行比较,对乙酰化淀粉的透明度、凝沉性、溶解度、溶胀度、黏度和质构特性等进行深入研究.结果表明,与原淀粉相比,红薯淀粉经乙酰化作用后,凝沉性明显减弱,乙酰化红薯淀粉透明度、溶解度和溶胀度都随着取代度的增加而增加,且明显高于原淀粉.乙酰化红薯淀粉的糊化温度降低6~10℃,最终黏度和回生值显著降低,硬度显著降低.

  8. Design of Single Ridge Sweet Potato Vine Shredder%单垄红薯薯藤切碎机的设计

    Institute of Scientific and Technical Information of China (English)

    申屠留芳; 巩尊国; 宗林新; 孙星钊; 孙成龙

    2014-01-01

    红薯味道甜美,富含碳水化合物、膳食纤维、胡萝卜素、维生素以及钾、镁、铜、硒、钙等10余种元素,其营养价值和养生保健作用很大。因此,红薯在世界各地是很多人喜欢的食物,近年来得到广泛的种植,因此红薯收割机器有着广阔的市场前景。藤蔓的处理是红薯收割的主要组成部分,人工切除耗时耗力,并且不能达到切碎的效果。红薯薯藤切碎机的设计能很好地将藤蔓切割、切碎且回归田地,使红薯藤的处理方便快捷,可增加土壤有机质,达到农业生产节本增效的目的。%Sweet potato taste sweet , rich in carbohydrates , dietary fiber , carotene , vitamins and potassium , magnesium , copper, selenium, calcium and so on more than 10 kinds of elements, the sweet potato is small, its nutritional value and health care function is great .Therefore , the sweet potato is a lot of people like the food in the world , in recent years more and more widely planted , so can harvest sweet potatoes machine has broad market prospects. The vine treatment is the main part of the sweet potato harvest , artificial excision and time-consuming , and cannot achieve the shredding effect .Design of sweet potato vine shredder can be chopped vines cut and return to field , the processing of sweet potato vine is convenient , at the same time , increase soil organic matter , to realize the agricultural production cost saving pur-pose .

  9. Nitrogen and arbuscular mycorrhizal fungi (AMF effect on two commercial sweet potato clones on an inseptisol soil

    Directory of Open Access Journals (Sweden)

    Alberto Espinosa Cuéllar

    2015-02-01

    Full Text Available Sweet potato [Ipomoea batatas L. (Lam], is the fifth most important food crop in developing countries due to its outstanding nutritional and culinary characteristics and it is also considered one of the two most important food crops along with cassava (Manihot esculenta Crantz. The response of various crops to inoculation with arbuscular mycorrhizal fungi is well known. The research was conducted at the The Research Institute of Tropical Root and Tuber Crops (INIVIT on an inseptisol soil. The objective was to compare the effect of five nitrogen doses in the presence or absence of an effective AMF strain oin two sweet potato clones ‘INIVIT B2-2005’ and ‘CEMSA 78-354’. Yield, colonization rate and amount of spores were evaluated. Treatments inoculated with effective strains obtained higher yields of 35 to 37 t.ha-1 with a dose of 60 kg N ha-1; and chemical fertilizer nitrogen was reduced by 37.5 % in the form of N. A yield of 30 to35 t.ha-1 was obtained with a dose of 90 kg ha-1 of N and no AMF application. In all cases the best colonization values and spore numbers in 50 g soil coincide with optimal fertilization doses for the treatment inoculated efficiently. Colonization values were in the range of 71 to 76 % and 628-659 spores for the nitrogen dose of 60 kg ha-1.

  10. Orange-Fleshed Sweet Potato: Successes and Remaining Challenges of the Introduction of a Nutritionally Superior Staple Crop in Mozambique.

    Science.gov (United States)

    Jenkins, Mica; Byker Shanks, Carmen; Houghtaling, Bailey

    2015-09-01

    Chronic vitamin A deficiency affects both women and children in Mozambique and populations worldwide and cannot be addressed through supplementation alone. Food-based approaches encouraging the consumption of vitamin A-rich foods, such as the orange-fleshed sweet potato (OFSP), have the potential to positively affect vitamin A status. A range of OFSP varieties have been introduced in sub-Saharan Africa in rural and urban environments and emergency and nonemergency contexts. To highlight the successes to date and remaining challenges of the introduction of OFSP to increase vitamin A consumption in Mozambique, collating a time line of key events. A systematic review of literature using The Preferred Reporting Items for Systematic Reviews and Meta-Analyses. The systematic search resulted in 20 studies that met inclusion criteria. Data extracted include author and year, study location and duration, project partners, project title, sample size and characteristics, objectives, methods and measures, and outcomes. Orange-fleshed sweet potatoes are widely accepted by Mozambican farmers and consumers, and various studies show a positive impact on vitamin A status due to the introduction of this nutritionally superior staple crop. Remaining challenges include vine preservation, pest and disease management, market development, and storage and processing. © The Author(s) 2015.

  11. Agrothechnical System for continuous production of sweet potatoes (Ipomoea batatas Lam in Trinidad´s City.

    Directory of Open Access Journals (Sweden)

    Juan Antonio Magdaleno Ortiz

    2012-04-01

    Full Text Available In prospective study different types of clones were identified recommended for the conditions edafoclimáticas of this municipality. That is why the objective of this work is to evaluate the productive results regarding to the potentialities of each established clone that facilitates to select an agrothecnical system that guarantees the increment and quality in the production of sweet potato in a continuous way in the municipality of Trinidad. The work was carried out in the Grange: Valle de los Ingenios Company of Agricultural FNTA, On an Alluvial floor of sandy slight texture and lightly flat topography, have being evaluated six sweet potatoes clones coming from the INIVIT, all commercial ones, for it was designed it an experiment in Latin Square with the clones: CEMSA 78-354 as witness, CEMSA 74-228, INIVIT B-98-2, INIVIT B-98-3, cautillo and INVIT 2005. It happens the same in the not very rainy time of November to April and rainy of May to November, The clones INIVIT 98-2 and INIVIT 2005 were the best for the not very rainy time and INIVIT 98-2 and CEMSA 74-228 for the rainy one; superiors to the witness CEMSA 78-354 and there was evidenced that in the planted area in the not very rainy time the losses are bigger for Tetuán in all of the clones.

  12. Effects of Lactic Acid Fermentation on the Retention of Β-Carotene Content in Orange Fleshed Sweet Potatoes

    Directory of Open Access Journals (Sweden)

    Benard O. Oloo

    2014-04-01

    Full Text Available This study aimed to establish the effects of lactic fermentation on the levels of β-carotene in selected  orange fleshed sweet potato (OFSP varieties from Kenya.  Furthermore,it sought to demonstrate fermentation as a potential process for making new products from sweet potato with enhanced nutraceutical attributes. The varieties (Zapallo, Nyathiodiewo and SPK004/06 were fermented with Lactobacillus plantarum MTCC 1407 at 25 ± 2°C for 48 h and kept for 28 days to make lacto-pickles. During fermentation both analytical [pH, titratable acidity (TA, lactic acid (LA, starch, total sugar, reducing sugar (g/kg roots, texture (N/m2, β-carotene (mg/kg roots] and sensory (texture, taste, flavour and after taste attributes of sweet potato lacto-juice were evaluated. Process conditions were optimized by varying brine levels, with fermentation time. A UV-visible spectrophotometer was used to identify and quantify β-carotene. Any significant variations (p < 0.05 in analytical attributes between the fermented and unfermented samples (pH, LA, TA and β-carotene concentration of lacto-pickles, prepared from the potato roots, were assessed. The study reported a final composition of 156.49mg/kg, 0.53mg/kg, 0.3N/m2, 1.3g/kg, 5.86g/kg, 0.5g/kg and 5.86g/kg for β-carotene, Ascorbic acid, texture; Starch, total sugars, LA and TA respectively, and a pH of 3.27. The fermented products were subjected to flavour profiling by a panel. The product sensory scores were 1.5 to 2.5 on a 5 point hedonic scale, ranging from dislike slightly to like much. The products with brine levels at 4 and 6% were most preferred. The retention of β-carotene was 93.97%. This demonstrated lactic acid fermentation as a better method for processing OFSP as the main nutritional attributes are retained. The final product was resistant to spoilage microorganisms after 28 days of fermentation. Further preservation could be obtained by addition of sodium metabisulphite. In conclusion, Lactic

  13. Sweet potato leaf extract inhibits the simulated in vitro gastrointestinal digestion of native starch

    Directory of Open Access Journals (Sweden)

    Toong Long Jeng

    2015-09-01

    Full Text Available Several studies have reported the therapeutic use of caffeoylquinic acid (CQA derivatives in the management of hyperglycemia. This study used a simulated in vitro gastrointestinal digestion model to assess the inhibitory effects of CQA derivatives-rich sweet potato leaf extract (SPLE and a commercially produced green coffee bean extract (GCBE, each with total polyphenols contents of 452 mg g−1 and 278 mg g−1, respectively, against starch digestion. The changes in the amounts of total polyphenols and total CQA derivatives during in vitro gastrointestinal digestion were also examined. The results indicated that both extracts contained substantial levels of CQA derivatives (136 mg g−1 and 83.5 mg g−1 of extract for SPLE and GCBE, respectively. The amounts of total polyphenols and total CQA derivatives in 20 mg of SPLE and GCBE samples decreased from 9.04 mg to 0.58 mg and from 5.56 mg to 0.58 mg, and from 2.72 mg to 0.16 mg and from 1.67 mg to 0.10 mg, respectively, following in vitro gastrointestinal digestion and subsequent dialysis. When SPLE and GCBE were accompanied with starch for in vitro digestion test, they both exhibited inhibitory effect against starch digestion during simulated intestinal digestion, with estimated half maximal inhibitory concentration (IC50 values of 4.91 mg and 6.06 mg polyphenols, respectively. The amount of glucose permeated through dialysis membrane also decreased significantly in comparison with the extract-negative control. Thus, both SPLE and GCBE were capable of modulating the release of glucose from starch digestion in simulated intestinal tract. The observed inhibitory effects against glucose release were presumably due in part to the presence of CQA derivatives in the tested extracts. The SPLE had higher inhibitory effect against in vitro starch digestion than the commercially prepared reference GCBE. Therefore, the SPLE might be used to manage hyperglycemia over the long term.

  14. Studies on Vacuum Drying Method to Preparing Sweet Potato Granules and Its Applications%真空干燥法制备甘薯全粉

    Institute of Scientific and Technical Information of China (English)

    李新华; 宋秀洁

    2012-01-01

    Vacuum drying method was chosen to preparing sweet potato granules. The effects of vacuum drying temperature, leaching of calcium concentration, cooking time and concentration of the added emulsifier on the free starch content of sweet potato granules was discussed. The optimal conditions were as followed through orthogonal experiment: the vacuum drying temperature 40℃ ,leaching of calcium concentration 25 mg/L, concentration of added emulsifier 0.2% , cooking time 12 min(the quality of sweet potato granules are best) , and the free starch content of sweet potato granules is 21.89%.%选用真空干燥方法制备甘薯熟制全粉,研究了真空干燥温度、浸钙浓度、蒸制时间和乳化剂添加量对甘薯熟制全粉游离淀粉含量的影响。利用正交试验优化了工艺参数,当干燥温度为40℃,浸钙浓度为25mg/L,乳化剂添加量为0.2%,蒸煮时间为12min时生产出的甘薯熟制全粉品质最好,游离淀粉含量为21.89%。

  15. Farmers' information on sweet potato production and millipede infestation in north-eastern Uganda. I. Associations between spatial and temporal crop diversity and the level of pest infestation

    NARCIS (Netherlands)

    Ebregt, E.; Struik, P.C.; Abidin, P.E.; Odongo, B.

    2004-01-01

    Sweet potato (Ipomoea batatas (L.) Lamk) is an important staple food for the people of north-eastern Uganda. Crop yields per unit area are low partly because of biological constraints, including pests like millipedes. The objective of this study was to generate information on pest incidence and cont

  16. Farmers' information on sweet potato production and millipede infestation in north-eastern Uganda. II. Pest incidence and indigenous control strategies

    NARCIS (Netherlands)

    Ebregt, E.; Struik, P.C.; Abidin, P.E.; Odongo, B.

    2004-01-01

    Sweet potato (Ipomoea batatas (L.) Lamk) is an important staple food for the people of north-eastern Uganda. Crop yields per unit area are low partly because of biological constraints, including pests like millipedes. The objective of this study was to generate information on pest incidence and cont

  17. Sweet potato resistance to Euscepes postfasciatus (Coleoptera: Curculionidae): larval performance adversely effected by adult's preference to tuber for food and oviposition.

    Science.gov (United States)

    Okada, Y; Yasuda, K; Sakai, T; Ichinose, K

    2014-08-01

    The preferences of the West Indian sweet potato weevil, Euscepes postfasciatus (Fairmaire), to tubers of sweet potato, Ipomoea batatas (L.), for food and for oviposition were evaluated, and correlated to sweet potato's resistance to immatures. Adults (parent) were released in a plastic box containing tubers of sweet potato cultivars and maintained for 5 d, after which the adults on each tuber were counted. All adults were then removed and each tuber was maintained separately. New adults that emerged from the tubers were counted. Cultivars were grouped by cluster analyses using the number of parent adults on the tubers and the number of new adults emerging from the tubers, adjusted for the weight of each tuber. Cultivars were divided into five groups: average level of preference, preferred, preferred for oviposition but not for food, preferred for food but not for oviposition, and not preferred. New adults from the first two groups took less time to eclose than those from the other groups, and their body size was smaller. In a second experiment, one to five cultivars were selected from each group and inoculated each tuber with 10 weevil eggs on each cultivar. Although the proportion of eclosed adults was not significantly different between cultivars, the time to eclosion was shorter and body size was smaller on preferred cultivars. The selection of tubers by parent adults was not linearly related with larval development, and did not reduce the survival of the immatures.

  18. Ensiled and dry cassava leaves, and sweet potato vines as a protein source in diets for growing Vietnamese large white Mong Cai pigs

    NARCIS (Netherlands)

    Nguyen, T.H.L.; Le, N.G.; Verstegen, M.W.A.; Hendriks, W.H.

    2010-01-01

    The aim of the present study was to evaluate the effects of replacing 70% of the protein from fish meal by protein from ensiled or dry cassava leaves and sweet potato vines on the performance and carcass characters of growing F1 (Large White¿Mong Cai) pigs in Central Vietnam. Twenty-five crossbred

  19. Fertilizer Application Effects of Ammonium Molybdate on Sweet Potato%微肥钼酸铵在甜薯上的应用效果研究

    Institute of Scientific and Technical Information of China (English)

    黎钦全

    2015-01-01

    This paper studied the effects of mixing different dosages of microelement fertilizer ammonium molybdate with sweet potato tubers on yield and resistance of sweet potato. The results showed that, when the dosages of N, P2O5 and K2O were 15 kg/667 m2, 6 kg/667 m2 and 20 kg/667 m2, the treatment, mixing 1 kg sweet potato tubers with 2 g ammonium molybdate, had the most remarkable effect on increasing yield and income with the increasing income of 1 783.4 Yuan/667 m2. Moreover, the resistance of sweet potato was enhanced as well.%研究了不同用量微量元素肥料钼酸铵拌种对甜薯产量和抗逆性的影响。试验结果表明,在氮、磷、钾肥用量分别为N 15 kg/667 m2,P2O56 kg/667 m2和K2O 20 kg/667 m2的基础上,每1 kg甜薯用钼酸铵2 g拌种,增产增收效果最显著,667 m2增收1783.4元,甜薯抗逆性也得到了增强。

  20. Comparison of the Proximate Composition, Total Carotenoids and Total Polyphenol Content of Nine Orange-Fleshed Sweet Potato Varieties Grown in Bangladesh

    Directory of Open Access Journals (Sweden)

    Mohammad Khairul Alam

    2016-09-01

    Full Text Available In an attempt to develop the food composition table for Bangladesh, the nutritional composition of nine varieties of orange-fleshed sweet potato was analyzed together with total carotenoids (TCC and total polyphenol content (TPC. Each variety showed significant variation in different nutrient contents. The quantification of the TCC and TPC was done by spectrophotometric measurement, and the proximate composition was done by the AOAC method. The obtained results showed that total polyphenol content varied from 94.63 to 136.05 mg gallic acid equivalent (GAE/100 g fresh weight. Among the selected sweet potatoes, Bangladesh Agricultural Research Institute (BARI Sweet Potato 7 (SP7 contained the highest, whereas BARI SP6 contained the lowest amount of total polyphenol content. The obtained results also revealed that total carotenoids content ranged from 0.38 to 7.24 mg/100 g fresh weight. BARI SP8 showed the highest total carotenoids content, whereas BARI SP6 showed the lowest. Total carotenoids content was found to be higher in dark orange-colored flesh varieties than their light-colored counterparts. The results of the study indicated that selected sweet potato varieties are rich in protein and carbohydrate, low in fat, high in polyphenol and carotenoids and, thus, could be a good source of dietary antioxidants to prevent free radical damage, which leads to chronic diseases, and also to prevent vitamin A malnutrition.

  1. Review on hygienical components of sweet potato and their functions%甘薯保健成分及其功能的研究进展

    Institute of Scientific and Technical Information of China (English)

    刘超; 王征; 兰时乐; 董蕾

    2007-01-01

    甘薯作为一种营养健康的食物,含有多种保健功能成分, 包括膳食纤维、维生素、可溶性蛋白等初级产物,以及咖啡酸及其衍生物、花青素、类胡萝卜素等丰富的次生代谢物质.越来越多的研究表明甘薯的许多次生代谢产物具有清除自由基,抗氧化,预防癌症、心血管疾病及糖尿病等保健功能.深入研究甘薯中保健功能活性成分对合理开发和利用甘薯资源具有重要意义.%Sweet potato not only contains primary materials such as dietary fiber, vitamin and soluble protein, but also provides abundant secondary metabolic products which have hygienical functions, like caffeic acid and caffeoylqinic acid derivatives, and anthocyanins, carotanoids. Many studies showed that many secondary products of sweet potato have hygienical functions as quenching free radicals, antioxidation, and preventing cancer, cardiovascular disease and diabetes. Further understanding of the hygienical functions of components in sweet potato is considered to be one of the important factors for developing new uses of sweet potato.

  2. Ileal and total tract apparent crude protein and amino acid digestibility of ensiled and dried cassava leaves and sweet potato vines in growing pigs

    NARCIS (Netherlands)

    Nguyen, T.H.L.; Ngoan, L.D.; Bosch, G.; Verstegen, M.W.A.; Hendriks, W.H.

    2012-01-01

    The present study was conducted to determine the ileal and total tract apparent digestibility of crude protein (CP) and amino acids (AA) in ensiled and dried cassava (Manihot esculenta) leaves (CL) and sweet potato (Ipomoea batatas) vines (SPV) as a single ingredient or in a 50:50 mixture of CL + SP

  3. Distribution of Phenolic Compounds and Antioxidative Activities in Parts of Sweet Potato (Ipomoea batata L.) plants and in home processed roots

    Science.gov (United States)

    We measured six phenolic compounds by HPLC, the total phenolic content by Folin-Ciocalteu, and antioxidative activities by three methods in the sweet potato plant and in home processed roots. Total phenolic content was highest in the leaves. Eight root varieties were partitioned and analyzed for p...

  4. Efficient Regeneration and Selection of Virus-free Sweetpotato Plants from Sweet Potato Leaf Curl Virus Infected Materials and Their Effects on Yields in Field Trials

    Science.gov (United States)

    Sweet potato leaf curl virus (SPLCV) is an emerging virus disease in sweetpotato (Ipomoea batata) in the U.S. The incidence of SPLCV infection on sweetpotato increased dramatically in recent years due to the explosion of whitefly, Bemisia tabaci (Gennadius) populations. Among several sweetpotato v...

  5. Ensiled and dry cassava leaves, and sweet potato vines as a protein source in diets for growing Vietnamese large white Mong Cai pigs

    NARCIS (Netherlands)

    Nguyen, T.H.L.; Le, N.G.; Verstegen, M.W.A.; Hendriks, W.H.

    2010-01-01

    The aim of the present study was to evaluate the effects of replacing 70% of the protein from fish meal by protein from ensiled or dry cassava leaves and sweet potato vines on the performance and carcass characters of growing F1 (Large White¿Mong Cai) pigs in Central Vietnam. Twenty-five crossbred p

  6. [Effects of nitrogen management on maize nitrogen utilization and residual nitrate nitrogen in soil under maize/soybean and maize/sweet potato relay strip intercropping systems].

    Science.gov (United States)

    Wang, Xiao-Chun; Yang, Wen-Yu; Deng, Xiao-Yan; Zhang, Qun; Yong, Tai-Wen; Liu, Wei-Guo; Yang, Feng; Mao, Shu-Ming

    2014-10-01

    A large amount of nitrogen (N) fertilizers poured into the fields severely pollute the environment. Reasonable application of N fertilizer has always been the research hotpot. The effects of N management on maize N utilization and residual nitrate N in soil under maize/soybean and maize/ sweet potato relay strip intercropping systems were reported in a field experiment in southwest China. It was found that maize N accumulation, N harvest index, N absorption efficiency, N contribution proportion after the anthesis stage in maize/soybean relay strip intercropping were increased by 6.1%, 5.4%, 4.3%, and 15.1% than under maize/sweet potato with an increase of 22.6% for maize yield after sustainable growing of maize/soybean intercropping system. Nitrate N accumulation in the 0-60 cm soil layer was 12.9% higher under maize/soybean intercropping than under maize/sweet potato intercropping. However, nitrate N concentration in the 60-120 cm soil layer when intercropped with soybean decreased by 10.3% than when intercropped with sweet potato, indicating a decrease of N leaching loss. Increasing of N application rate enhanced N accumulation of maize and decreased N use efficiency and significantly increased nitrate concentration in the soil profile except in the 60-100 cm soil layer, where no significant difference was observed with nitrogen application rate at 0 to 270 kg · hm(-2). Further application of N fertilizer significantly enhanced nitrate leaching loss. Postponing N application increased nitrate accumulation in the 60-100 cm soil layer. The results suggested that N application rates and ratio of base to top dressing had different influences on maize N concentration and nitrate N between maize/soybean and maize/sweet potato intercropping. Maize N concentration in the late growing stage, N harvest index and N use efficiency under maize/soybean intercropping increased (with N application rate at 180-270 kg · hm(-2) and ratio of base to top dressing = 3:2:5) and

  7. Composition of suberin-associated waxes from the subterranean storage organs of seven plants : Parsnip, carrot, rutabaga, turnip, red beet, sweet potato and potato.

    Science.gov (United States)

    Espelie, K E; Sadek, N Z; Kolattukudy, P E

    1980-10-01

    The waxes associated with the suberin in the periderm of the underground storage organs of parsnip (Pastinaca sativa L.), carrot (Daucus carota L.), rutabaga (Brassica napobrassica Mill.), turnip (Brassica rapa L.), red beet (Beta vulgaris L.), sweet potato (Ipomoea batatas L.) and potato (Solanum tuberosum L.) were isolated, fractionated into hydrocarbon, wax ester, free fatty alcohol and free fatty acid fractions, and analyzed by combined gas chromatography and mass spectrometry. The amount of wax extracted from the periderm of the storage organs ranged from 2 to 32 μg/cm(2). The hydrocarbons from the suberin layer have a broader chain-length distribution, a predominance of shorter carbon chains, and a higher proportion of even-numbered carbon chains than the leaf alkanes from the same plants. The major components of the free and esterified fatty alcohols and fatty acids have an even number of carbon atoms, and are similar in chain-length distribution to their counterparts found covalently attached to the suberin polymers; however, these suberin components are shorter in chain length than their cuticular analogues from the leaves. Also extracted from the storage organs were polar components which included fatty alcohols and fatty acids in a conjugated form, and ω-hydroxy acids and dicarboxylic acids. Evidence is presented that removal of the wax from the periderm of whole storage organs results in a decrease in diffusion resistance to moisture.

  8. Transgenic sweet potato expressing thionin from barley gives resistance to black rot disease caused by Ceratocystis fimbriata in leaves and storage roots.

    Science.gov (United States)

    Muramoto, Nobuhiko; Tanaka, Tomoko; Shimamura, Takashi; Mitsukawa, Norihiro; Hori, Etsuko; Koda, Katsunori; Otani, Motoyasu; Hirai, Masana; Nakamura, Kenzo; Imaeda, Takao

    2012-06-01

    Black rot of sweet potato caused by pathogenic fungus Ceratocystis fimbriata severely deteriorates both growth of plants and post-harvest storage. Antimicrobial peptides from various organisms have broad range activities of killing bacteria, mycobacteria, and fungi. Plant thionin peptide exhibited anti-fungal activity against C. fimbriata. A gene for barley α-hordothionin (αHT) was placed downstream of a strong constitutive promoter of E12Ω or the promoter of a sweet potato gene for β-amylase of storage roots, and introduced into sweet potato commercial cultivar Kokei No. 14. Transgenic E12Ω:αHT plants showed high-level expression of αHT mRNA in both leaves and storage roots. Transgenic β-Amy:αHT plants showed sucrose-inducible expression of αHT mRNA in leaves, in addition to expression in storage roots. Leaves of E12Ω:αHT plants exhibited reduced yellowing upon infection by C. fimbriata compared to leaves of non-transgenic Kokei No. 14, although the level of resistance was weaker than resistance cultivar Tamayutaka. Storage roots of both E12Ω:αHT and β-Amy:αHT plants exhibited reduced lesion areas around the site inoculated with C. fimbriata spores compared to Kokei No. 14, and some of the transgenic lines showed resistance level similar to Tamayutaka. Growth of plants and production of storage roots of these transgenic plants were not significantly different from non-transgenic plants. These results highlight the usefulness of transgenic sweet potato expressing antimicrobial peptide to reduce damages of sweet potato from the black rot disease and to reduce the use of agricultural chemicals.

  9. Ascorbic acid, β-carotene, sugars, phenols, and heavy metals in sweet potatoes grown in soil fertilized with municipal sewage sludge.

    Science.gov (United States)

    Antonious, George F; Dennis, Sam O; Unrine, Jason M; Snyder, John C

    2011-01-01

    Municipal sewage sludge (MSS) used for land farming typically contains heavy metals that might impact crop quality and human health. A completely randomized experimental design with three treatments (six replicates each) was used to monitor the impact of mixing native soil with MSS or yard waste (YW) mixed with MSS (YW +MSS) on: i) sweet potato yield and quality; ii) concentration of seven heavy metals (Cd, Cr, Mo, Cu, Zn, Pb, and Ni) in sweet potato plant parts (edible roots, leaves, stem, and feeder roots); and iii) concentrations of ascorbic acid, total phenols, free sugars, and β-carotene in sweet potato edible roots at harvest. Soil samples were collected and analyzed for total and extractable metals using two extraction procedures, concentrated nitric acid (to extract total metals from soil) as well as CaCl₂ solution (to extract soluble metals in soil that are available to plants), respectively. Elemental analyses were performed using inductively coupled plasma mass spectrometry (ICP-MS). Overall, plant available metals were greater in soils amended with MSS compared to control plots. Concentration of Pb was greater in YW than MSS amendments. Total concentrations of Pb, Ni, and Cr were greater in plants grown in MSS+YW treatments compared to control plants. MSS+YW treatments increased sweet potato yield, ascorbic acid, soluble sugars, and phenols in edible roots by 53, 28, 27, and 48%, respectively compared to plants grown in native soil. B-carotene concentration (157.5 μg g⁻¹ fresh weight) was greater in the roots of plants grown in MSS compared to roots of plants grown in MSS+YW treatments (99.9 μg g⁻¹ fresh weight). Concentration of heavy metals in MSS-amended soil and in sweet potato roots were below their respective permissible limits.

  10. 甘薯甜度与薯块蒸煮前后糖分的相关性研究%Study on the Correlation Between Sweetness and Sugar of Sweet Potato Before and After Steaming

    Institute of Scientific and Technical Information of China (English)

    吴列洪; 沈升法; 李兵

    2012-01-01

    357 sweet potato breeding selective nursery colony with dry matter content 17. 26% -42.42% before and after steaming were used to detect reducing sugar, soluble sugar and sweetness. Study shows high significant correlation between sweetness and reducing sugar, soluble sugar of cooked potato and soluble sugar of crude potato, with correlation coefficient 0. 360 * * ,0.277 * * ,0. 274 * * , and it has no obvious correlation between sweetness and reducing sugar with correlation coefficient only 0. 039. Decomposition studies of soluble sugar of cooked potato have shown that reducing sugar and soluble sugar produced during steaming provided with the sweetness of the contribution rate respectively 47.66% ,32.07%. According to the colony average analysis of sweetness grade,it also shown very significant correlationbetween sweetness and soluble sugar of cooked potato, and soluble sugar of crude potato with correlation coefficient 0.977 ** ,0.974** ,0.962** ,and it has no obvious correlation between sweetness and reducing sugar with correlation coefficient only 0.225. Colony distribution studies of the above sweetness index shown that reducing sugar, soluble sugar of crude potato and reducing sugar of cooked potato appeared a narrow normal distribution, and soluble sugar of cooked potato appeared a wide normal distribution. Drawing a comprehensive analysis,there is more significant correlation between soluble sugar of cooked potato and sweetness,more differences among varieties. So,the soluble sugar of cooked potato is more suitable for the index of sweetness evaluating of sweet potato and edible food quality breeding The sweetness of sweet potato is mainly from the sugar produced during steaming instead of fresh potato.%测定了357个干率范围在17.26%~42.42%的甘薯育种选种圃群体蒸煮前后的还原糖、可溶性糖及其甜度.研究表明:甜度与熟薯的可溶性糖、还原糖、生薯可溶性糖呈极显著相关,相关系数分别为0.360**

  11. Preparation and properties of cold-water-soluble sweet potato starch%冷水可溶甘薯淀粉的制备及性能

    Institute of Scientific and Technical Information of China (English)

    陆珠华; 冉龙强; 陆国权

    2013-01-01

    以甘薯淀粉为原料,采用乙醇-碱法对冷水可溶甘薯淀粉(CWS)的制备进行了研究,优化了制备冷水可溶甘薯淀粉的工艺条件,并对冷水可溶甘薯淀粉的黏度特性、凝沉性和透明度进行了测定.结果表明,冷水可溶甘薯淀粉的最佳制备工艺条件为:乙醇体积分数80%,料液比为1∶5(g/mL),氢氧化钠溶液(3mol/L)加入量为30mL,反应温度35℃.在最佳条件下,冷水可溶甘薯淀粉的溶解度可高达87.92%.扫描电镜观察表明,冷水可溶甘薯淀粉颗粒表面有较大的凹陷和一些孔洞并且发生黏连,使其具有较好溶解性和粘性,并且其糊的凝沉性、抗剪切稳定性加强,但透明度有所降低.%The preparation of cold-water-soluble sweet potato starch was studied using alcohol-alkaline method,sweet potato starch as raw materials.The process conditions for preparing cold-water-soluble sweet potato starch were optimized.At same time,the viscosity property,retrogradation,and transparency of cold-watersoluble sweet were also determined.The results indicated that the best process conditions for preparing coldwater-soluble sweet potato starch were:amount of sodium hydroxide 30mL,volume concentration of ethanol 80%,alkalization temperature 35℃,and ratio of solid to liquid 1∶5.Under the best conditions,the solubility of CWS sweet potato starch would reach 87.92%.The scanning electronic microscope revealed a lot of depressions and keyholes on the surface of CWS sweet potato starch particles,including the existence of adhesion of both,which made its great solubility and viscosity.What's more,retrogradation,stability of the starch paste were all better than the original one.However,the transparency had been reduced.

  12. Sweet potato [Ipomoea batatas (L.) Lam.] cultivated as tuber or leafy vegetable supplier as affected by elevated tropospheric ozone.

    Science.gov (United States)

    Keutgen, Norbert; Keutgen, Anna J; Janssens, Marc J J

    2008-08-13

    Sweet potato cultivars respond differently to elevated tropospheric ozone concentrations of ca. 130 mug m (-3), 8 h a day for 4 weeks, which affects their selection for cultivation. In the first cultivar presented here, an adequate leafy vegetable supplier, the ozone load resulted in a shift of biomass to maintain the canopy at the expense of tuber development. Starch content of leaves was reduced, indicating an impairment of quality, but carotenoid content remained stable. The second cultivar may be grown for tuber production. Although the ratio tuber/plant remained stable under ozone, tuber yield and its starch content were significantly reduced. The lower starch content indicated a worse quality for certain industrial processing, but it is desirable for chip production. Elevated tropospheric ozone concentrations also influenced free amino acids and macronutrient contents of tubers, but these modifications were of minor significance for tuber quality in the second cultivar.

  13. Aqueous extracts of some medicinal plants are as toxic as Imidacloprid to the sweet potato whitefly, Bemisia tabaci.

    Science.gov (United States)

    Ateyyat, Mazen A; Al-Mazra'awi, Mohammad; Abu-Rjai, Talal; Shatnawi, Mohamad A

    2009-01-01

    Aqueous extracts of nine plants, known to have medicinal activity, were tested for their toxicity against the sweet potato whitefly, Bemisia tabaci Genn. (Homoptera: Aleurodidae) compared to the toxicity of the insecticide, Imidacloprid. Extracts of Lepidiuim sativum L. (Brassicales: Brassicaceae) killed 71 % of early stage nymphs, which was not significantly different from mortality caused by Imidacloprid. Treatment of pupae with three plant extracts, L. sativum, Achillea biebersteinii L. (Asterales: Asteraceae), or Retama raetam (Forssk.) Webb and Berthel (Fabales: Fabaceae) prevented adult development, and treatment with R. raetam extract killed adults, at levels that were not significantly different from Imidacloprid. None of the other plants showed significant toxicity. However extracts of four plants, Pimpinella anisum L. (Apiales: Apiaceae), Galium longifolium (Sibth. and SM.) (Gentianales: Rubiaceae), R. raetam and Ballota undulata Bentham (Lamiales: Lamiaceae) had a repellent effect.

  14. Caracterização morfológica de acessos de batata-doce Morphologic characterization of sweet potato

    Directory of Open Access Journals (Sweden)

    Máskio Daros

    2002-03-01

    Full Text Available Objetivando caracterizar morfologicamente acessos de batata-doce da Coleção de Germoplasma da UENF e visando otimizar a utilização de genomas de interesse para o melhoramento, foram instalados dois experimentos, ambos em blocos ao acaso com três repetições. Os plantios foram realizados em novembro e em dezembro de 1997, ambos na cidade de Campos dos Goytacazes (RJ. Para tanto, quatorze acessos de batata-doce foram avaliados quanto a descritores da parte aérea e das raízes, num total de vinte características. Constatou-se a ocorrência de variabilidade genética entre os acessos, proporcionada principalmente pelas características pubescência do ápice das ramas, pigmentação das nervuras inferiores da folha e formato das raízes. Os acessos 'Amarelinha', 'Roxinha', 'WON-B' e 'Campina 3' apresentaram características de interesse para o mercado consumidor Norte- Fluminense.To characterize morphologically accesses of sweet potato from the germplasm collection of the Universidade Estadual do Norte Fluminense (UENF Brazil, as a way to optimize the utilization of important genomes for plant breeding, two experiments were carried out in field conditions, both in a randomized blocks design with three replications. The experiments were done in November at UENF and December in Campos. For such experiment, fourteen sweet potato accesses were evaluated for different traits related to aerial parts, and root descriptors, in a total of twenty characteristics. Genetic variability between accesses was observed, mainly due to characteristics of pubescence of the stem apex, pigmentation of the inferior veins of leaves and shape of roots. The accesses, Amarelinha, Roxinha, WON-B and Campina 3 presented interesting characteristics for the market of north-fluminense region.

  15. Application of IBA in environmental remediation using skins of cocoa (Theobroma cacao) and sweet potatoes (Ipomoea batatas)

    Energy Technology Data Exchange (ETDEWEB)

    Sumbu, K. [Department of Chemistry, Cape Peninsula University of Technology, PO Box 1906, Bellville, 7535 (South Africa); Mars, J.A.; Gihwala, D. [Department of Biomedical Sciences, Cape Peninsula University of Technology, PO Box 1906, Bellville, 7535 (South Africa)

    2013-07-01

    Full text: The industrial sector is one of the most dynamic sectors of the economy and is of cardinal importance in economic development and poverty alleviation. Furthermore, economies with low levels of industrialisation are gradually shifting dependence from agriculture to the industrial sector, while developed economies, with a high level of industrialisation, are shifting from the industrial to the service sector [1]. Amongst the various industrial sectors, a substantial portion of effluents containing heavy metals are generated by electroplating (nickel, lead, zinc and copper), tanneries (chrome) and other chemical industries. Many engineering processes have been designed to remove the heavy metals from the polluted parts of the ecosystem. These processes are however highly capital intensive. To establish a less costly means of removal of heavy metal pollution, the dried skins of cocoa (Theobroma cacao) and sweet potato (Ipomoea batatas) were pulverized and used in the absorption of the heavy metals Ni and Pb. After adsorption by the metals, the powders were dried and then pressed into tablets. For quantification of the elemental adsorption, PIXE, using the Geo PIXE computational software, is a versatile multi-element analytical technique, and has minimum detection limits down to concentration ranges as low as 0.1 parts per million [2,3]. To determine the composition of the major elements such as C, O and N, Backscattering Spectrometry, using SimNRA software, [4] was used. In this study we report on the economic viability of using the skins of cocoa and sweet potato in the removal of Ni and Pd from polluted waters. (author)

  16. Study on the Gel-freezing Method Preparation Chinese Sweet Potato Microporous Starch%凝胶-冷冻法制备红薯微孔淀粉工艺的研究

    Institute of Scientific and Technical Information of China (English)

    傅新征; 许海基; 张仪秀

    2015-01-01

    以红薯淀粉为原材料制备红薯微孔淀粉,以红薯微孔淀粉的吸水率和吸油率为指标,探讨并优化凝胶–冷冻法制备红薯微孔淀粉的工艺参数。结果表明,制备红薯微孔淀粉的优化工艺参数为:红薯淀粉乳浓度100 g/L、糊化时间40 min、冷冻时间39 h、糊化温度90℃,此工艺下制备的红薯微孔淀粉吸水率为467.51%、吸油率为76.36%。%Chinese sweet potato starch was used as the raw materials to prepared Chinese sweet potato microporous starch. The water absorption rate and oil absorption rate of Chinese sweet potato microporous starch were used as indexes, discuss and optimize the process conditions of the gel-freezing method preparation Chinese sweet potato microporous starch. The results showed that the optimum prepara-tion process conditions of Chinese sweet potato microporous starch:Chinese sweet potato starch milk concentration 10g/100ml, gelatiniza-tion time 40min, freezing time 39h, gelatinization temperature 90℃. Under the condition, the water absorption rate of Chinese sweet potato microporous starch was 467.51%, and the oil absorption rate of Chinese sweet potato microporous starch was 76.36%.

  17. 紫色马铃薯芽快繁技术研究%Study on the Hormone of Micropropagation Technology of Purple Potato Bud

    Institute of Scientific and Technical Information of China (English)

    汪云; 罗富英; 李典; 李路金; 蓝素华

    2012-01-01

    In this experiment,purple potato(Solanum tuberosum L.)was used as the experimental material.Studing on the concept of micropropagation of purple potato bud expant,and some cultural plantlets were obtained successfully.The experimental results indicated that separately using 75% CH3CH2OH(8 min) and 0.1% HgCI2(10 s) to sterilize the loseeonds,the average number of buds up to 23,and the buds grow well.The buds induction medium of purple potato was MS+0.5mg/L 6-BA +0.3 mg/L NAA +30 g/L sucros +7 g/L agar.The rate of buds differentiation was 57.50%,the plantlets growed thick and strong,and the sprout growed evenly.The height of plant was 5.12 cm,and the rate of root growing reached to 60.00%.%以幼嫩紫色马铃薯芽为试验材料,探讨不同激素组合对紫色马铃薯芽快速繁殖生长情况的影响,并成功获得一批无菌苗。结果表明:以75%酒精(CH3CH2OH)、0.1%升汞分别灭菌10 s、8 min,外植体诱导出芽数最高可达23个,长势良好。紫色马铃薯芽诱导培养基为MS+0.5 mg/L 6-BA+0.3 mg/L NAA+30 g/L蔗糖+7 g/L琼脂,芽分化成苗率为57.50%,茎粗壮,长势整齐,苗高5.12 cm,生根率达60.00%。

  18. 海藻酸钠对红薯面包老化的影响%Influence of Sodium Alginate on the Burn-in of Sweet Potato Bread

    Institute of Scientific and Technical Information of China (English)

    翟光超

    2015-01-01

    通过单因素实验研究了海藻酸钠不同添加量对红薯面包老化的影响。结果表明,当海藻酸钠的添加量为1.0%时,可有效延缓红薯面包老化的进程。%The influence on the burn-in of sweet potato bread by the different addition amount of sodium alginate is studied through the experiment of single factor. The result shows that when the adding amount of sodium alginate is 1.0%, it can effectively delay the burn-in development of sweet potato bread.

  19. Effect of Different Drying Methods on Quality of Sweet Potato Products%不同干燥方式对甘薯产品品质的影响

    Institute of Scientific and Technical Information of China (English)

    丁媛媛; 毕金峰; 木泰华; 于静静; 赖必辉

    2011-01-01

    研究热风干燥、真空干燥、真空微波干燥、真空冷冻干燥和变温压差膨化干燥5种不同干燥方式对甘薯干燥产品物理性质、营养成分和微观结构的影响。结果表明:硬度:热风干燥〉变温压差膨化干燥〉真空微波干燥〉真空干燥〉真空冷冻干燥;色泽:热风干燥〉真空干燥〉变温压差膨化干燥〉真空微波干燥〉真空冷冻干燥;粗蛋白和粗纤维含量经过干燥加工后无明显变化;5种干燥加工处理均可使甘薯产品粗淀粉含量减少,还原糖含量增加;干燥处理后甘薯β-胡萝卜素和VC都大幅度下降;真空冷冻干燥产品与变温压差膨化样品的细胞结构孔隙较大且均匀一致,呈现出较好的蜂窝状结构;热风干燥与真空干燥产品结构紧密;真空微波干燥产品细胞结构致密,密度较大。综合看来,变温压差膨化干燥产品品质优良且生产成本也较低,适宜于进行甘薯干燥加工的工业化生产。%The effects of 5 drying methods including hot air drying,vacuum microwave drying,extrusion drying with variable temperature and pressure difference,vacuum freeze drying and vacuum drying on physical properties,nutritional composition and microstructure of sweet potato products were investigated.Hot air drying resulted in the largest harness followed by extrusion drying with variable temperature and pressure difference,vacuum microwave drying,vacuum drying and vacuum freeze drying.Hot air-dried sweet potato products exhibited the largest ΔE* followed by those dried by vacuum drying,extrusion drying with variable temperature and pressure difference,vacuum microwave drying and vacuum freeze drying.Sweet potato products showed no remarkable change in their crude protein or crude fiber contents before and after drying.All of the five drying methods could result in a decrease in the crude starch content and an increase in the reducing sugar content of sweet potato products

  20. Nutrient Balance in Relation to High Yield and Good Quality of Potato on an Acid Purple Soil in Chongqing,China

    Institute of Scientific and Technical Information of China (English)

    HETIANXIU; HEFUJIAN; 等

    2001-01-01

    A field experiment was carried out to study nutrient balance among N,P,K and Mg in potato cultivation on an acid purple soil in Chongqing,China,The experiment included 8 treatments with equal P rate of 120 kg P2O5 hm-2 :N0K2,N1K2,NK2K2,N3K2,N2K0,N2K1,N2K1Mg and N2K3,where N0,N1,N2 and N3 stand for the N rates of 0,75,150 and 225 kg N hm-2 ,and K0,K1,K2 and K3 for the K rates of 0,165,330 and 495kg K2O hm-2,respectively,Among the treatments designed ,Treatment N2K2 with a nutrient suply ration of N:P2O5:K2O:MgO=1.25:1.275:0.28 gave the highest tuber yield nd dry matter ,highest starch and Zn and lowest NO3- contents in tuber,and high N,P and K use effciency with and uptake ratio of N:P:K:Mg=11.38:1:13.32:0.33 by tuber,Yield and starch and protein contents of tuber were the lowest in Treatment N0K2.Dry matter was the highest N,P and K utilization rates .Statistical analysis showed that yields of tuber and starch were in a positive linear correlation with the uptake amount of various nutrients and protein of the potato tuber was in a significantly positive linear correlation with tuber N content and in a singificantly negative linear correlation with tuber K and Mg contents .Balaced application of N,P,K and Mg fertilizers(Treatment N2K2)was recommended for realiztion of high yield and good quality in potato cultivation.

  1. The genome of cultivated sweet potato contains Agrobacterium T-DNAs with expressed genes: An example of a naturally transgenic food crop.

    Science.gov (United States)

    Kyndt, Tina; Quispe, Dora; Zhai, Hong; Jarret, Robert; Ghislain, Marc; Liu, Qingchang; Gheysen, Godelieve; Kreuze, Jan F

    2015-05-05

    Agrobacterium rhizogenes and Agrobacterium tumefaciens are plant pathogenic bacteria capable of transferring DNA fragments [transfer DNA (T-DNA)] bearing functional genes into the host plant genome. This naturally occurring mechanism has been adapted by plant biotechnologists to develop genetically modified crops that today are grown on more than 10% of the world's arable land, although their use can result in considerable controversy. While assembling small interfering RNAs, or siRNAs, of sweet potato plants for metagenomic analysis, sequences homologous to T-DNA sequences from Agrobacterium spp. were discovered. Simple and quantitative PCR, Southern blotting, genome walking, and bacterial artificial chromosome library screening and sequencing unambiguously demonstrated that two different T-DNA regions (IbT-DNA1 and IbT-DNA2) are present in the cultivated sweet potato (Ipomoea batatas [L.] Lam.) genome and that these foreign genes are expressed at detectable levels in different tissues of the sweet potato plant. IbT-DNA1 was found to contain four open reading frames (ORFs) homologous to the tryptophan-2-monooxygenase (iaaM), indole-3-acetamide hydrolase (iaaH), C-protein (C-prot), and agrocinopine synthase (Acs) genes of Agrobacterium spp. IbT-DNA1 was detected in all 291 cultigens examined, but not in close wild relatives. IbT-DNA2 contained at least five ORFs with significant homology to the ORF14, ORF17n, rooting locus (Rol)B/RolC, ORF13, and ORF18/ORF17n genes of A. rhizogenes. IbT-DNA2 was detected in 45 of 217 genotypes that included both cultivated and wild species. Our finding, that sweet potato is naturally transgenic while being a widely and traditionally consumed food crop, could affect the current consumer distrust of the safety of transgenic food crops.

  2. Molecular characterization of sweet potato leaf curl virus isolate from China (SPLCV-CN) and its phylogenetic relationship with other members of the Geminiviridae.

    Science.gov (United States)

    Luan, Yu Shi; Zhang, Juan; Liu, Dan Mei; Li, Wen Li

    2007-10-01

    A Sweet potato-infecting sweet potato leaf curl virus (SPLCV) isolated in China was detected by Polymerase Chain Reaction (PCR). PCR products amplified from DNA-A were cloned and sequenced. The isolates of SPLCV from China(SPLCV-CN)has a genome organization similar to that of monopartite begomoviruses. The DNA-A had two ORFs (AV1 and AV2) in the virion sense and four ORFs (AC1, AC2, AC3, and AC4) in the complementary sense, separated by an intergenic region (IR) containing a conserved stem-loop motif. Three incomplete direct repeat iterons were also found within the IR. The presence of AV2 ORF supports the relationship of SPLCV-CN to the Old World gemimiviruses. Sequence comparisons showed that the DNA-A sequence of SPLCV-CN were closely related to those of sweet potato leaf curl Georgia virus-[16] (SPLCGV-[16]), Ipomoea yellow vein virus (IYVV-SI), and sweet potato leaf curl virus (SPLCV) with nucleotide sequence identity ranging from 88% to 91%. Comparison of individual encoded proteins between SPLCV-CN and that of three other SPLCV isolates showed the coat protein (AV1) shared the highest amino acid sequence identity (93%-96%), suggesting the coat protein of these viruses may have identical ancestor. The relationships between SPLCV-CN and other whitefly-transmitted geminiviruses were investigated by using phylogeny of derived AV1, AC1, and AV2 amino acid sequences. In all phylogenetic trees, SPLCV-CN clustered with three other isolates of SPLCV. The analyses revealed that the four isolates of SPLCV have coat proteins which are unique from its counterparts from both the Old World and New World. The present of AV2 and phylogenic analysis of AC1 suggest that SPLCV is more close to begomoviruses from the Old World but isolates of this virus seems to form a separate subset.

  3. Study on physicochemical properties of resistant starch prepared from sweet potato starch%甘薯抗性淀粉理化性质研究

    Institute of Scientific and Technical Information of China (English)

    张芸; 李小定; 郑政东; 何芒芒; 李杰; 曲智雅; 朱少华; 刘蒙; 曲露

    2013-01-01

    采用酶法结合超声波处理制备抗性淀粉,并分析其颗粒分布、晶体结构类型、淀粉分子结构、热特性等理化特性 结果表明,甘薯抗性淀粉颗粒分布、粒径大小、晶体结构、熔融温度明显不同于甘薯淀粉.甘薯抗性淀粉平均粒径、糊化峰值温度、终止温度大于甘薯淀粉;甘薯淀粉结晶结构表现为C型,甘薯抗性淀粉结晶结构表现为B型,酶解辅以超声波处理的方法可以制备高含量的抗性淀粉.%Sweet potato resistant starch were prepared by using enzymatic de - branching combined ultrasonic treatment,then partial physicochemical properties including particle size distribution, crystal structure, thermal properties were studied.Results showed that there were significant difference in the particle size distribution,mean diameter,crystal structure,and melt temperature between sweet potato resistant starch and sweet potato starch. The resistant starch exhibited significantly higher overall size, peak gelatinization temperature, conclusion temperature than sweet potato starch.X-ray diffraction patterns indicated that the crystal structure of native starch was C type and that the crystal structure of resistant starch was B type. Results showed that enzyme hydrolysis modification combined ultrasonic treatment could prepare high content of resistant starch.

  4. Structure and characterization of a cDNA clone for phenylalanine ammonia-lyase from cut-injured roots of sweet potato

    Energy Technology Data Exchange (ETDEWEB)

    Tanaka, Yoshiyuki; Matsuoka, Makoto; Yamanoto, Naoki; Ohashi, Yuko; Kano-Murakami, Yuriko; Ozeki, Yoshihiro (National Institute of Agro-Environmental Sciences, Ibaraki (Japan) Univ. of Tokyo (Japan))

    1989-08-01

    A cDNA clone for phenylalanine ammonia-lyase (PAL) induced in wounded sweet potato (Ipomoea batatas Lam.) root was obtained by immunoscreening a cDNA library. The protein produced in Escherichia coli cells containing the plasmid pPAL02 was indistinguishable from sweet potato PAL as judged by Ouchterlony double diffusion assays. The M{sub r} of its subunit was 77,000. The cells converted ({sup 14}C)-L-phenylalanine into ({sup 14}C)-t-cinnamic acid and PAL activity was detected in the homogenate of the cells. The activity was dependent on the presence of the pPAL02 plasmid DNA. The nucleotide sequence of the cDNA contained a 2,121-base pair (bp) open-reading frame capable of coding for a polypeptide with 707 amino acids (M{sub r} 77,137), a 22-bp 5{prime}-noncoding region and a 207-bp 3{prime}-noncoding region. The results suggest that the insert DNA fully encoded the amino acid sequence for sweet potato PAL that is induced by wounding. Comparison of the deduced amino acid sequence with that of a PAL cDNA fragment from Phaseolus vulgaris revealed 78.9% homology. The sequence from amino acid residues 258 to 494 was highly conserved, showing 90.7% homology.

  5. In vitro evaluation of physiological activity of vinegar produced from barley-, sweet potato-, and rice-shochu post-distillation slurry.

    Science.gov (United States)

    Ye, Xiu Juan; Morimura, Shigeru; Han, Lian Shu; Shigematsu, Toru; Kida, Kenji

    2004-03-01

    Vinegar was produced from barley-, sweet potato-, and rice-shochu post-distillation slurry using jar fermentor within 19 hrs. All the vinegars showed radical-scavenging activity, angiotensin I converting enzyme (ACE) inhibition and advanced glycation endproducts (AGE) inhibition in vitro. The radical-scavenging activity of the vinegar produced from sweet potato-shochu post-distillation slurry was higher than that of other two kinds of vinegar on the organic matter basis. The ACE inhibitory activities of all the vinegars were higher than that of each post-distillation slurry. The main components that showed ACE inhibitory activity would be peptides, and their content increased during acetic acid fermentation. Regarding AGE inhibition, only rice-shochu post-distillation slurry did not show such activity, but the other two post-distillation slurries and all the vinegars showed clear inhibitory activity. The activity appeared to depend on the concentration of amino groups except for sweet potato-shochu post-distillation slurry and the vinegar produced from it.

  6. 甘薯耐盐碱研究进展%Advances of Research on the Saline-alkali Tolerant in Sweet Potato(Iponoea batatas L.)

    Institute of Scientific and Technical Information of China (English)

    解备涛; 王庆美; 张海燕; 李爱贤; 侯夫云; 董顺旭; 汪宝卿; 张立明

    2013-01-01

    The saline-alkali stress was one of the most important issue limiting the crop yield in China ,while the sweet potato is one of the most important crop in China .This article reviewed the damage mechanism of saline-alkali stress on plant and the adaptation mechanism of plant to saline-alkali stress ,meanwhile the effect of saline-al-kali stress on the sweet potato and the development of research on salt resistance in sweet potato was discussed .%盐碱胁迫是我国当前农作物生长面临的重要问题之一,甘薯是我国重要的薯类作物,本研究综述了盐碱胁迫对植物的伤害机理和植物对盐碱胁迫的适应机理、盐碱胁迫对甘薯影响的研究进展以及甘薯耐盐碱研究的发展方向。

  7. The use of plant cell wall-degrading enzymes from newly isolated Penicillium ochrochloron Biourge for viscosity reduction in ethanol production with fresh sweet potato tubers as feedstock.

    Science.gov (United States)

    Huang, Yuhong; Jin, Yanling; Shen, Weiliang; Fang, Yang; Zhang, Guohua; Zhao, Hai

    2014-01-01

    Penicillium ochrochloron Biourge, which was isolated from rotten sweet potato, can produce plant cell wall-degrading enzymes (PCWDEs) with high viscosity reducing capability for ethanol production using fresh sweet potato tubers as feedstock. The enzyme preparation was characterized by a broad enzyme spectrum including 13 kinds of enzymes with the activity to hydrolyze cellulose, hemicellulose, pectin, starch, and protein. The maximum viscosity-reducing capability was observed when the enzyme preparation was obtained after 5 days of fermentation using 20 g/L corncob as a sole carbon source, 4.5 g/L NH4 NO3 as a sole nitrogen source, and an initial medium pH of 6.5. The sweet potato mash treated with the enzyme preparation exhibited much higher fermentation efficiency (92.58%) compared with commercial cellulase (88.06%) and control (83.5%). The enzyme production was then scaled up to 0.5, 5, and 100 L, and the viscosity-reducing rates were found to be 85%, 90%, and 91%, respectively. Thus, P. ochrochloron Biourge displays potential viscosity-reducing capability for ethanol production.

  8. Phenolics extraction from sweet potato peels: modelling and optimization by response surface modelling and artificial neural network.

    Science.gov (United States)

    Anastácio, Ana; Silva, Rúben; Carvalho, Isabel S

    2016-12-01

    Sweet potato peels (SPP) are a major waste generated during root processing and currently have little commercial value. Phenolics with free radical scavenging activity from SPP may represent a possible added-value product for the food industry. The aqueous extraction of phenolics from SPP was studied using a Central Composite Design with solvent to solid ratio (30-60 mL g(-1)), time (30-90 min) and temperature (25-75 °C) as independent variables. The comparison of response surface methodology (RSM) and artificial neural network (ANN) analysis on extraction modelling and optimising was performed. Temperature and solvent to solid ratio, alone and in interaction, presented a positive effect in TPC, ABTS and DPPH assays. Time was only significant for ABTS assay with a negative influence both as main effect and in interaction with other independent variables. RSM and ANN models predicted the same optimal extraction conditions as 60 mL g(-1) for solvent to solid ratio, 30 min for time and 75 °C for temperature. The obtained responses in the optimized conditions were as follow: 11.87 ± 0.69 mg GAE g(-1) DM for TPC, 12.91 ± 0.42 mg TE g(-1) DM for ABTS assay and 46.35 ± 3.08 mg TE g(-1) DM for DPPH assay. SPP presented similar optimum extraction conditions and phenolic content than peels of potato, tea fruit and bambangan. Predictive models and the optimized extraction conditions offers an opportunity for food processors to generate products with high potential health benefits.

  9. Synergistic Antioxidant Activity of Sweet Potato Extracts in Combination with Tea Polyphenols and Pueraria Flavonoid in Vitro

    Directory of Open Access Journals (Sweden)

    Xiaojuan Liu

    2014-02-01

    Full Text Available The antioxidant activity of Sweet Potato Extracts (SPE can be enhanced by the presence of these other active antioxidants such as Tea Polyphones (TP and Pueraria Flavonoid (PF. Since many of these natural antioxidants are consumed together in foods, the potential for synergistic interactions is high in the human diet. The aim of this study was to determine what concentrations and combinations of antioxidants among SPE, TP and PF are capable of producing synergistic antioxidant effects, based on potato-based food products. Solutions of the antioxidant activity of SPE, TP and PF, alone and in different combinations were measured using the stable free radical 2, 2-Diphenyl-1-Picrylhydrazyl (DPPH and Ferric Reducing Anti-oxidant Power (FRAP method. A comparison of the antioxidant activity of the combinations of antioxidants to the arithmetic sum of the antioxidant activity of the individual antioxidants was used to calculate the Synergistic Effects (SEs between the antioxidants. The results showed that all concentrations of TP and PF combination with SPE (1 and 1.5% could produce significant SEs (p<0.05 of DPPH and FRAP for the two or three component mixtures. With the concentration of 1% SPE, 1×10-5 g/mL TP and 5×10-5 g/mL PF in the three-component mixture, the highest SE of DPPH and FRAP was both detected. The results suggested that the antioxidant property of this combination was substantially superior to the sum of the individual antioxidant effects and these interactions can enhance the antioxidant effectiveness of SPE. The results could guide in the formulation and development of functional food products that have high antioxidant potential.

  10. Determination of Anthocyanin Content in Purple Potato Wine by pH-differential Method%pH 示差法测定紫薯酒中花青素的含量

    Institute of Scientific and Technical Information of China (English)

    桑戈; 赵力; 谭婷婷; 安宝祯; 王家林

    2015-01-01

    紫薯酒是以紫薯、麦曲和酵母为原料发酵生产的低酒精度酿造酒,富含对人体有保健作用的花青素,使用离心分离法从发酵醪液中获取紫薯酒样品,优化适合紫薯酒的pH示差法测定条件,确定测定波长为526 nm,测定pH值为1和4.5,平衡温度为20℃,平衡时间为110 min,测定紫薯酒中的花青素含量为564.6 mg/L。%Purple potato wine is a kind of low-alcohol brewing wine fermented by purple potato, malt and yeast, and it is rich in anthocyanins which have health-care function on human body. In the experiment, purple potato wine samples were separated from the fermented mash by centrifugation separation method. The measurement conditions of pH-differential method were optimized as follows:detecting wavelength was 526 nm, detecting pH value was 1 and 4.5 respectively, the equilibrium temperature was at 20℃, and the equilibrium time was 110 mins. Un-der above conditions, anthocyanin content in purple potato wine was measured as 564.6 mg/L.

  11. 紫薯抹茶酸奶的研制%Development of Yoghourt of Purple Sweet Potato and Matcha

    Institute of Scientific and Technical Information of China (English)

    陈景鑫; 郭玲玲; 张苗; 夏爽

    2015-01-01

    以紫薯和抹茶为原料研制紫薯抹茶酸奶,优化出最佳配方为:紫薯汁15%,蔗糖10%,菌种2%,抹茶粉可根据口味需要适量加入.成品色泽呈淡紫色,组织状态均匀,奶香味、紫薯味和抹茶味浓郁,具有一定的保健价值.

  12. Biomolecular characterization, identification, enzyme activities of molds and physiological changes in sweet potatoes (Ipomea batatas) stored under controlled atmospheric conditions

    Institute of Scientific and Technical Information of China (English)

    C O OLADOYE; I F CONNERTON; R M O KAYODE; P F OMOJASOLA; I B KAYODE

    2016-01-01

    Microbial attacks during storage are one of the primary causes of product deterioration, and can limit the process of prolonging the shelf-life of harvested food. In this study, sweet potatoes were stored at temperatures of 13, 21, and 29 °C for 4 weeks. Samples were colected during storage and plated on potato dextrose agar, from which axenic mold cultures were obtained and identified using 26S rRNA gene sequences. Physiological changes of potato tubers were assessed with respect to pathogenicity, enzyme activity, and atmospheric storage conditions. Six fungal species were identified, namelyPenicilium chrysogenum (P. rubens),P. brevicompactum,Mucor circineloides, Cladosporium cladosporiodes,P. expansum, andP. crustosum.The folowing fungal isolates, namely P. expansum,P. brevicompactum, andRhizopus oryzae, were recovered from the re-infected samples and selected according to their levels of enzyme activity. This study revealed high levels of activity for celulase and pectinase, which were most notable during the initial three days of testing, and were folowed by a steady decrease (P  目的:鉴定甘薯贮藏环境中霉菌的生物分子特征和酶活性,并比较不同试剂处理后甘薯的生理变化。方法:从不同温度下保存的甘薯得到霉菌菌株,提取其细菌基因组DNA,进行聚合酶链反应(PCR)及测序鉴定。将甘薯分成扑海因处理组、次氯酸钠处理组和对照组,在为期三个月的贮藏时间内,对霉菌致病性、酶活性和空气条件对甘薯的生理变化的影响进行评估。结论:实验结束后,扑海因处理组的变质率为5%,次氯酸钠组为55%,对照组为100%。研究发现,甘薯组织变质主要由于不同的微生物酶的活动,尤其是受感染组织的果胶酶活性。因此,建议将扑海因作为甘薯贮藏之前的保鲜剂。

  13. Effects of extrusion cooking on some functional properties of soy-sweet potato mixtures--a response surface analysis.

    Science.gov (United States)

    Iwe, M O

    2000-01-01

    Mixtures of defatted soy flour and sweet potatoes were extruded at 0:100, 25:75, 50:50, 75:25 and 100:0 ratios in an Insta-Pro 600 single screw extruder operated at 180, 200, 220 rpm. Oil (3-5%) was added into the mix before extrusion. A 5 x 32 fractional factorial central composite response surface design was adopted for investigating the variables: feed composition, % oil, and screw rotation speed (RPM). Percent oil and screw speed were randomly investigated at three levels, while feed composition was randomly investigated at five levels. Effect of extrusion cooking on functional properties: bulk density, expansion ratio, water absorption and solubility indices and trypsin inhibitor were assessed. Results showed that feed composition and screw speed had strong influences on the process. The effect of adding oil, into defatted soybean significantly (p 130 degrees C), and accompanying high shear, were the result of the non-pasting nature of the extrudate. Therefore the products may have limited uses.

  14. Physicochemical properties of starches and expression and activity of starch biosynthesis-related genes in sweet potatoes.

    Science.gov (United States)

    Lai, Yung C; Wang, Shu Y; Gao, Huan Y; Nguyen, Khiem M; Nguyen, Chinh H; Shih, Ming C; Lin, Kuan H

    2016-05-15

    The functional properties of starches from six sweet potato varieties containing various starch components and structures were studied in an attempt to identify starch sources for industrial uses. Tainan 18 (TNN18) with high-amylose (AM) starch exhibited high setback and breakdown viscosities, high water solubility at 85°C but low swelling volume at 65°C, and high hardness and adhesiveness; in contrast, the low-AM starch of Tainung 31 (TNG31) had opposite characteristics. Seven genes related to starch biosynthesis were tested, and GBSS, SS, SBEII, ISA, and AGPase were highly expressed in TNN18 and TNG31; however, transcript levels in DBE and SBE were extremely low. GBSS and SS activity reflected the abundance of GBSS and SS mRNA in TNG31 and TNN18, and expression of AGPase, GBSS, SS, and SBE in TNN18 substantially increased content of AM. The expression and activity of DBE had a significant effect on TNG31 with increased AP content.

  15. Superior molasses assimilation, stress tolerance, and trehalose accumulation of baker's yeast isolated from dried sweet potatoes (hoshi-imo).

    Science.gov (United States)

    Nishida, Osamu; Kuwazaki, Seigo; Suzuki, Chise; Shima, Jun

    2004-07-01

    Yeast strains were isolated from dried sweet potatoes (hoshi-imo), a traditional preserved food in Japan. Dough fermentation ability, freeze tolerance, and growth rates in molasses, which are important characteristics of commercial baker's yeast, were compared between these yeast strains and a commercial yeast derivative that had typical characteristics of commercial strains. Classification tests including pulse-field gel electrophoresis and fermentation/assimilation ability of sugars showed that almost the stains isolated belonged to Saccharomyces cerevisiae. One strain, ONY1, accumulated intracellular trehalose at a higher level than commercial strain T128. Correlated with intracellular trehalose contents, the fermentation ability of high-sugar dough containing ONY1 was higher. ONY1 also showed higher freeze tolerance in both low-sugar and high-sugar doughs. The growth rate of ONY1 was significantly higher under batch and fed-batch cultivation conditions using either molasses or synthetic medium than that of strain T128. These results suggest that ONY1 has potential commercial use as baker's yeast for frozen dough and high-sugar dough.

  16. Natural association of two different betasatellites with Sweet potato leaf curl virus in wild morning glory (Ipomoea purpurea) in India.

    Science.gov (United States)

    Swapna Geetanjali, A; Shilpi, S; Mandal, Bikash

    2013-08-01

    Wild morning glory (Ipomoea purpurea) was observed to be affected by leaf curl and yellow vein diseases during summer-rainy season of 2009 in New Delhi, India. The virus was experimentally transmitted through whitefly, Bemisia tabaci to I. purpurea that reproduced the two distinct symptoms. Sequence analysis of multiple full-length clones obtained through rolling circle amplification from the leaf curl and yellow vein samples showed 91.8-95.3% sequence identity with Sweet potato leaf curl virus (SPLCV) and the isolates were phylogenetically distinct from those reported from Brazil, China, Japan and USA. Interestingly, two different betasatellites, croton yellow vein mosaic betasatellite and papaya leaf curl betasatellite were found with SPLCV in leaf curl and yellow vein diseases of I. purpurea, respectively. This study is the first report of occurrence of SPLCV in wild morning glory in India. SPLCV was known to infect other species of morning glory; our study revealed that I. purpurea, a new species of morning glory was a natural host of SPLCV. To date, betasatellite associated with SPLCV in Ipomoea spp. is not known. Our study provides evidence of natural association of two different betasatellites with SPLCV in leaf curl and yellow vein diseases of I. purpurea.

  17. The effect of a sweet potato, footbath, and acupressure intervention in preventing constipation in hospitalized patients with acute coronary syndromes.

    Science.gov (United States)

    Ren, Kai; Qiu, Jingbo; Wang, Xiaohua; Niu, Fenglin; Jiang, Tingbo

    2012-01-01

    Constipation is a common health problem that adversely affects quality of life and the prognosis of hospitalized patients with acute coronary syndromes (ACS). The purpose of this study was to develop and test the sweet potato/footbath/acupressure massage (SFA) intervention as a safe treatment for prevention of constipation and to increase satisfaction with bowel emptying in hospitalized patients with ACS. The study was a prospective, randomized controlled trial with a sample of 93 patients (SFA group, n = 44; usual care group, n = 49). Patients in the SFA group received SFA intervention combined with usual care. The results showed that there were statistical differences between the two groups in terms of (1) the incidence of constipation; (2) the use of laxatives and enemas; (3) patients' subjective satisfaction with their bowel emptying during hospitalization; and (4) sensation of incomplete evacuation and anorectal obstruction/blockade. The SFA intervention was more effective, economical, and practical than usual care alone in managing constipation and satisfaction with defecation in patients hospitalized with ACS.

  18. Inoculation of somatic embryos of sweet potato with an arbuscular mycorrhizal fungus improves embryo survival and plantlet formation.

    Science.gov (United States)

    Bressan, W; de Carvalho, C H; Sylvia, D M

    2000-08-01

    Responses of somatic embryos of sweet potato (Ipomoea batata (L.) Poir., cv. White Star) at different developmental stages to in vitro inoculation with Glomus etunicatum (Becker and Gerdemann) (isolate INVAM FL329) were evaluated. Somatic embryos were grown in glass tubes containing sterilized vermiculite and sand. A layer of natrosol plus White's medium was used as a carrier for arbuscular mycorrhizal (AM) fungal spores. Survival of embryos inoculated with AM fungi was significantly (P < 0.05) greater than that of noninoculated embryos at the rooted-cotyledonary-torpedo and rooted-elongated-torpedo developmental stages. Mycorrhizae significantly (P < 0.05) increased plantlet formation only when inoculation occurred at the rooted-elongated-torpedo developmental stage. The growth stage at which the embryos were inserted into the glass tubes exerted a significant influence upon plantlet formation, and plantlet formation was further enhanced by inoculation with G. etunicatum. Plantlet formation was greatest at the rooted-elongated-torpedo stage. These results demonstrate that inoculation of somatic embryos with AM fungi improves embryo survival and plantlet formation, and could enhance use of somatic embryos as synthetic seeds.

  19. Non-invasive delivery of dsGST is lethal to the sweet potato whitefly, Bemisia tabaci (G.) (Hemiptera: Aleyrodidae).

    Science.gov (United States)

    Asokan, R; Rebijith, K B; Roopa, H K; Kumar, N K Krishna

    2015-02-01

    The sweet potato whitefly, Bemisia tabaci (G.) biotype B (Hemiptera: Aleyrodidae), is one of the most economically important pest, by being a dreaded vector of Geminiviruses, and also causes direct damage to the crops by sucking phloem sap. Glutathione S-transferase (GST) is a large family of multifunctional enzymes that play pivotal roles in the detoxification of secondary allelochemical produced by the host plants and in insecticide resistance, thus regulates insect growth and development. The objective of this study is to show the potential of RNA interference (RNAi) in the management of B. tabaci. RNAi is a sequence-specific gene silencing mechanism induced by double-stranded RNA (dsRNA) which holds tremendous potential in pest management. In this regard, we sequenced the GST from B. tabaci and synthesized approximately 500-bp dsRNA from the above and delivered through diet to B. tabaci. Real-time quantitative PCR (RT-qPCR) showed that continuous application of dsGST at 1.0, 0.5, and 0.25 μg/μl reduced mRNA expression levels for BtGST by 77.43, 64.86, and 52.95 % which resulted in mortality by 77, 59, and 40 %, respectively, after 72 h of application. Disruption of BtGST expression will enable the development of novel strategies in pest management and functional analysis of vital genes in B. tabaci.

  20. Life cycle energy efficiency and environmental impact assessment of bioethanol production from sweet potato based on different production modes.

    Science.gov (United States)

    Zhang, Jun; Jia, Chunrong; Wu, Yi; Xia, Xunfeng; Xi, Beidou; Wang, Lijun; Zhai, Youlong

    2017-01-01

    The bioethanol is playing an increasingly important role in renewable energy in China. Based on the theory of circular economy, integration of different resources by polygeneration is one of the solutions to improve energy efficiency and to reduce environmental impact. In this study, three modes of bioethanol production were selected to evaluate the life cycle energy efficiency and environmental impact of sweet potato-based bioethanol. The results showed that, the net energy ratio was greater than 1 and the value of net energy gain was positive in the three production modes, in which the maximum value appeared in the circular economy mode (CEM). The environment emission mainly occurred to bioethanol conversion unit in the conventional production mode (CPM) and the cogeneration mode (CGM), and eutrophication potential (EP) and global warming potential (GWP) were the most significant environmental impact category. While compared with CPM and CGM, the environmental impact of CEM significantly declined due to increasing recycling, and plant cultivation unit mainly contributed to EP and GWP. And the comprehensive evaluation score of environmental impact decreased by 73.46% and 23.36%. This study showed that CEM was effective in improving energy efficiency, especially in reducing the environmental impact, and it provides a new method for bioethanol production.

  1. Avaliação de acessos de batata-doce para resistência à broca-da-raiz, crisomelídeos e elaterídeos Screening of sweet potato accessions for resistance to the West Indian sweet potato weevil, chrysomelids and elaterids

    Directory of Open Access Journals (Sweden)

    Félix Humberto França

    2002-03-01

    Full Text Available Foram avaliados para resistência a danos causados por insetos nas folhas e raízes, no campo, 366 acessos do Banco Ativo de Germoplasma de batata-doce da Embrapa Hortaliças. Os insetos de interesse foram Diabrotica spp., Conoderus sp., Epitrix sp., e a broca-da-raiz da batata-doce, Euscepes postfasciatus. Considerando o estrato raízes, aproximadamente 21% dos acessos avaliados mostraram-se resistentes a crisomelídeos e elaterídeos, tendo sido identificados pelo menos sete clones melhores que a referência padrão de resistência àqueles insetos, a cultivar Brazlândia Roxa. Sete acessos, entre esses o CNPH 005, CNPH 026 e CNPH 258 mostraram-se bastante homogêneos e consistentes em três avaliações. Esses mesmos clones, além dos clones CNPH 088, CNPH 295, CNPH 314 e CNPH 318 mostraram-se entre os mais resistentes à broca-da-raiz, porque tiveram 7% ou menos das suas raízes tuberosas danificadas por Euscepes postfasciatus enquanto as cultivares Brazlândia Branca e Princesa obtiveram, respectivamente, 23,3% e 53,3% de danos. Outros nove acessos foram classificados como mais suscetíveis que essas cultivares. A aplicação desses resultados no manejo integrado de pragas em batata-doce é discutido.Three hundred sixty six sweet potato plant accessions of the Sweet potato Germplasm Bank of Embrapa Hortali��as (Brazil were evaluated in the field for resistance to the Wireworm-Diabrotica-Systena (WDS pest complex: Diabrotica spp., Conoderus sp., Epitrix sp., and West Indian sweet potato weevil, Euscepes postfaciatus. About 21% of all plant accessions showed high resistance to chrysomelids and elaterids. Seven clones, among them CNPH 005, CNPH 026 and CNPH 258 were more resistant than the standard resistant commercial cultivar Brazlândia Roxa. These sweet potato accessions and CNPH 088, CNPH 295, CNPH 314 and CNPH 318, were the most promising sources of resistance against the West Indian sweet potato weevil because they had 7% or less

  2. Extraction Storage and Qualitative Analysis of Free Radicals Scavenging Substances from Sweet Potato Leaves%甘薯叶中清除自由基活性物质的提取·保存与定性分析

    Institute of Scientific and Technical Information of China (English)

    王友升; 董银卯; 宋彦; 黑维俭

    2008-01-01

    [Objective] The research aimed to provide reference for the application d extracts from sweet potato leaves in anti-aging cosmetics. [Method] The extraction and storage conditions for free radicals scavenging substances ham sweet potato leaves were optimized by orthogonal test and the bioactive components in extracts were investigated by correlation analysis. [ Result] Sweet potato leaves contain the bioactive substances scavenging DPPH free radi-cal and hydroxyl free radical. Extracting solvent species is the most important factor that influencing extraction yield. The optimal extraction and storage conditions are as following: water as solvent, pH 8.0 of extracting liquid, storage at 25 0C. There is a good positive linear relationship between the content of total phenols in sweet potato leaves and corresponding scavenging rates against both the DPPH free radical and hydroxyl free radical. For the content of total flavones in sweet potato leaves, just a correlation with scavenging rate against hydroxyl-free radical shown in test. [Conclusion] The phenols in ex-tracts could effectively scavenge both the DPPH free radical and hydroxyl free rad/cal, whereas the flavones in extzacts can only function on the hydroxyl free radical.

  3. 花青素型甘薯不同生长时期光合光响应特性研究%Study on Photosynthetic Light Response Characteristics of Anthocyanin-Type Sweet Potato in Different Growth Periods

    Institute of Scientific and Technical Information of China (English)

    张磊; 刘维正; 辛国胜; 韩俊杰; 商丽丽; 邱鹏飞; 林祖军

    2015-01-01

    本试验对花青素型甘薯烟紫薯2号(Y2)、烟紫薯3号(Y3)和日本紫薯(RZ)不同生长时期的光合光响应变化和光合参数进行研究。结果表明,花青素型甘薯最大净光合速率( Pnmax )以块根膨大初期最大,其次是块根盛长期,块根膨大末期小,各时期间差异均显著(P<0.05);块根膨大末期的初始量子效率(α)远高于膨大初期值,而光饱和点(Isat)却相反,不同生长时期的光补偿点(Ic)和暗呼吸速率(Rd)无明显差异。对不同品种光合特性比较表明,块根盛长期的α和Rd以RZ为最高,其次是Y2,Y3最低,但Y3的Isat最高;块根膨大末期RZ的Pnmax和Isat均显著高于Y2和Y3,而RZ的Rd则最低。%In this experiment , the photosynthetic light response and photosynthetic parameters of three anthocyanin-type sweet potato varieties , Yanzishu 2 ( Y2) , Yanzishu 3 ( Y3) and Japanese purple sweet po-tato ( RZ) , in different growth periods were studied .The results showed that the maximum net photosynthetic rate (Pnmax) of anthocyanin-type sweet potato as the largest in the initial root -enlargement period, and then rapid root -enlargement period , late root -enlargement period in order .The differences between different growth periods were significant ( P<0 .05 ) .The initial quantum efficiency (α) of latter root-enlargement period was much bigger than the initial value , but the light saturation point ( Isat ) was opposite.The differ-ences in light compensation point (Ic) and dark respiration rate (Rd) between different growth periods were not significant .Compared between different varieties , RZ had the highest αand R d in the rapid enlargement period of root, followed by Y2 and Y3;Y3 had the hightest Isat.In the late growth period, the Pnmax and Isat of RZ were all significantly higher than those of Y2 and Y3, but Rd of RZ was the lowest .

  4. 改性甘薯果胶对癌细胞增殖的影响%Effects of Modified Sweet Potato Pectins on the Proliferation of Cancer Cells

    Institute of Scientific and Technical Information of China (English)

    张燕燕; 木泰华; 张苗

    2012-01-01

    [目的]探讨pH改性和热改性甘薯果胶对结肠癌细胞HT-29、乳腺癌细胞Bcap-37和肝癌细胞SMMC7721增殖的影响.[方法]分别对改性前后甘薯果胶的半乳糖醛酸含量、酯化度、分子量、微观结构及癌细胞增殖抑制活性进行测定.[结果]果胶改性后半乳糖醛酸含量显著提高(P<0.05),而酯化度和分子量降低,微观结构发生明显变化.未改性、pH改性和热改性甘薯果胶对3种癌细胞均有抑制作用,并呈浓度和时间依赖性;改性后甘薯果胶对3种癌细胞增殖抑制效果均有显著提高(P<0.05),且改性甘薯果胶对HT-29和Bcap-37的抑制效果更显著.[结论]改性甘薯果胶对HT-29和Bcap-37的增殖抑制效果较好,具有潜在的抗结肠癌和乳腺癌作用.%[Objective ] Effects of pH-modified and heat-treated sweet potato pectins on proliferation of human colon cancer cell HT-29, human breast cancer cell Bcap-37 and human hepatoma cancer cell SMMC-7721 were investigated. [Method] The galacturonic acid content, degree of estenfication (DE), molecular weight, microstmcture and activity of cancer cell proliferation inhibition of pectins (natural, pH-modified and heat-treated pectins) were determined, respectively. [ Result] Modification increased galacturonic acid content of sweet potato pectin, whereas decreased its DE and molecular weight significantly (P<0.05). The microstructures of modified pectins were obviously different from microstructure of natural pectin. Natural and modified sweet potato pectins could inhibit the proliferation of three types of cancer cells in time- and concentration-dependent manner. In addition, the inhibitory effect of modified sweet potato pectins on three types of cancer cells increased significantly compared to natural pectin (P<0.05). Furthermore, the proliferation-inhibitory effects of modified pectins on HT-29 and Bcap-37 were better than that of modified pectins on SMMC-7721. [Conclusion] Proliferation of HT

  5. Preparation and characteristics of modified sweet potato dregs fiber powder%改性薯渣纤维粉制备及特性研究

    Institute of Scientific and Technical Information of China (English)

    张颖; 张佳琪; 肖颜林; 徐德琼; 陈功; 游敬刚

    2012-01-01

    以鲜甘薯为原料,研究改性薯渣纤维粉的制备及特性。采用纤维素酶酶法改性工艺,通过响应面法优化的工艺参数为:酶浓度1.45%、酶解pH5.0、酶解时间4h、酶解温度50℃;改性薯渣纤维粉品质特性如持水率和膨胀力大幅度提高,溶解性、吸油能力和流动性有较小幅度的提高;制作高黏度的改性纤维制品需适当控制添加剂如NaCl、NaHCO3的含量,蔗糖的添加有利于制作高黏度的改性纤维制品。%The preparation and characteristics of modified sweet potato dregs fiber powder were studied with fresh sweet potato as raw material by using cellulose enzymatic modified process and response surface method. The optimization process parameters were enzyme concentration 1.45%, enzyme pH5.0, hydrolysis time 4 h, hydrolysis temperature 50 %; The quality characters of modified sweet potato dregs fiber powder such as the water-holding ratio and expansive force were improved greatly, other indexes such as solubility, oil-absorption capability and fluidity improved less; The content of additive such as salt and sodium bicarbonate should be controlled advisably in the high viscosity modified fiber and the viscosity was getting bigger along with the increasing addition of sugar.

  6. Orange-fleshed sweet potato-based infant food is a better source of dietary vitamin A than a maize-legume blend as complementary food.

    Science.gov (United States)

    Amagloh, Francis Kweku; Coad, Jane

    2014-03-01

    White maize, which is widely used for complementary feeding and is seldom fortified at the household level, may be associated with the high prevalence of vitamin A deficiency among infants in low-income countries. The nutrient composition of complementary foods based on orange-fleshed sweet potato (OFSP) and cream-fleshed sweet potato (CFSP), maize-soybean-groundnut (Weanimix), and a proprietary wheat-based infant cereal (Nestlé Cerelac) were assessed using the Codex Standard (CODEX STAN 074-1981, Rev. 1-2006) specification as a reference. Additionally, the costs of OFSP complementary food, CFSP complementary food, and Weanimix production at the household level were estimated. Phytate and polyphenols, which limit the bioavailability of micronutrients, were assessed. Energy, macronutrients, and micronutrients listed as essential composition in the Codex Standard were determined and expressed as energy or nutrient density. All the formulations met the stipulated energy and nutrient densities as specified in the Codex Standard. The beta-carotene content of OFSP complementary food exceeded the vitamin A specification (60 to 180 microg retinol activity equivalents/100 kcal). All the formulations except Weanimix contained measurable amounts of ascorbic acid (> or = 32.0 mg/100 g). The level of phytate in Weanimix was highest, about twice that of OFSP complementary food. The sweet potato-based foods contained about twice as much total polyphenols as the cereal-based products. The estimated production cost of OFSP complementary food was slightly higher (1.5 times) than that of Weanimix. OFSP complementary food is a good source of beta-carotene and would therefore contribute to the vitamin A requirements of infants. Both OFSP complementary food and Weanimix may inhibit iron absorption because of their high levels of polyphenols and phytate, respectively, compared with those of Nestlé Cerelac.

  7. 红薯发酵产丁醇的工艺优化%Optimization on Fermentation Conditions of Butanol from Sweet Potato

    Institute of Scientific and Technical Information of China (English)

    田毅红; 朱志豪; 高媛; 张雨婷; 李文林; 龚大春

    2016-01-01

    对以红薯为原料、丙酮丁醇梭菌发酵产丁醇的工艺条件进行了优化,考察了红薯浓度、外加氮源及浓度、乙酸钠添加量对发酵的影响。结果表明:当红薯浓度为8%、乙酸铵浓度为2%(即碳氮比为20)、乙酸钠添加量为0.4%时,发酵液中丁醇含量达到最高,为14.410 mg·mL-1,较优化前显著提高。为发酵法产丁醇的工业化生产奠定了基础。%Fermentation conditions of Clostridium acetobutylicum to produce butanol by using sweet potato as raw material were optimized.Effects of the concentration of sweet potato,the type and concentration of addi-tional nitrogen source,and the dosage of sodium acetate on fermentation were investigated.The results showed that,when the concentration of sweet potato was 8%,the concentration of ammonium acetate was 2%(C/N val-ue was 20 ),the dosage of sodium acetate was 0.4%,the content of butanol in fermentation broth reached 14.410 mg·mL-1 ,which obviously higher than that of non-optimization process.The study lays the foundation for industrialization of butanol production by fermentation.

  8. Comparison of the Suitability of Contiguous Fallow-forest Lands for Cassava, Yam, Cocoyam and Sweet Potato Production in Nsukka, Southeastern Nigeria

    Directory of Open Access Journals (Sweden)

    Asadu Charles L. A.

    2017-01-01

    Full Text Available This analysis compared the suitability of contiguous fallow-forest lands for cassava, yam, cocoyam and sweet potato production in Nsukka, south-eastern Nigeria. The fallow plots were brought into cultivation in 1998 under the IITA-UNN long-term collaborative research. The sole cassava plots were grown to cassava only continuously for five years and then left to fallow. Soil samples were collected from 0-20 cm depth in triplicates using an auger and core sampler from the seven representative fallow plots previously grown to sole cassava from 1998–2003 and under fallow till date as well as the adjacent forest land. The objective was to use the soil qualities as recovered during the fallow period and those from the original adjacent forest to determine their current suitability for the production of the four crops. Using the FAO’s principle of limiting conditions revealed that after 13 yrs of fallow, the plots grown to sole cassava was classified as highly suitable (S1 for sweet potato production but moderately suitable (S2 for cassava, yam and cocoyam production. The remnant forest land was highly suitable for sweet potato production but moderately suitable for cassava, yam and cocoyam production. The dominant soil limitations are organic matter, low cation exchange capacity and exchangeable potassium for both cassava and yam production. The major limitations to cocoyam production are low available phosphorous, base saturation and soil pH. If these constraints are addressed adequately by soil nutrient management programmes all the plots will scale up to S1 class for the four crops.

  9. The use of volcanic ash from the eruption of Mount Kelud in East Java for improving yield of sweet potato grown on a sandy soil

    Directory of Open Access Journals (Sweden)

    H. Melsandi

    2015-07-01

    Full Text Available The purpose of this study was to explore the effect of volcanic ash from the eruption of Mount Kelud and compost on the soil properties and production of sweet potato on a sandy soil. The treatments of this study were (a a combination of and volcanic ash with the proportion of 100: 0, 90:10, 80:20, and 70:30 (% weight, (b the addition of compost (2.5 and 5 t / ha, and (c two varieties of sweet potato (Manohara and Ayamurazaki. The soil used in this study is the topsoil (0-30 cm Psament or sandy Entisol obtained from sweet potato cultivation location in Sumber Pasir Village of Pakis District, South Malang. Ten kilograms of planting medium (soil + volcanic ash for each treatment was placed in a 15 kg plastic pot. Sixteen treatments arranged in a factorial completely randomized design with three replications. The results showed that application of Mount Kelud volcanic ash and compost was able to improve soil permeability, soil pH, organic C, and K-total, but did not significantly affect total N content, available P and K total land. The highest fresh tuber weights of 373.51 g / plant or 19.92 t / ha and 393.09 g / plant or 20.96 t / ha for Manohara and Ayumurazaki varieties, respectively, were observed in the treatment of 10% volcanic ash + 5 t compost / ha. The carbohydrate content of Manohara variety was higher than that of Ayamurazaki variety at each treatment. The highest carbohydrate content of the Manohara variety (23.52% was obtained through application of 20% volcanic ash + 2.5 t compost/ha, while that of the Ayamurazaki variety (22.42% was obtained through application of 30% volcanic ash + 2.5 t/ha.

  10. Polyphenol-rich sweet potato greens extract inhibits proliferation and induces apoptosis in prostate cancer cells in vitro and in vivo.

    Science.gov (United States)

    Karna, Prasanthi; Gundala, Sushma R; Gupta, Meenakshi V; Shamsi, Shahab A; Pace, Ralphenia D; Yates, Clayton; Narayan, Satya; Aneja, Ritu

    2011-12-01

    Sweet potato (Ipomoea batatas) leaves or greens, extensively consumed as a vegetable in Africa and Asia, are an excellent source of dietary polyphenols such as anthocyanins and phenolic acids. Here, we show that sweet potato greens extract (SPGE) has the maximum polyphenol content compared with several commercial vegetables including spinach. The polyphenol-rich SPGE exerts significant antiproliferative activity in a panel of prostate cancer cell lines while sparing normal prostate epithelial cells. Mechanistically, SPGE perturbed cell cycle progression, reduced clonogenic survival, modulated cell cycle and apoptosis regulatory molecules and induced apoptosis in human prostate cancer PC-3 cells both in vitro and in vivo. SPGE-induced apoptosis has a mitochondrially mediated component, which was attenuated by pretreatment with cyclosporin A. We also observed alterations of apoptosis regulatory molecules such as inactivation of Bcl2, upregulation of BAX, cytochrome c release and activation of downstream apoptotic signaling. SPGE caused DNA degradation as evident by terminal deoxynucleotidyl transferase-mediated dUTP-nick-end labeling (TUNEL) staining of increased concentration of 3'-DNA ends. Furthermore, apoptotic induction was caspase dependent as shown by cleavage of caspase substrate, poly (adenosine diphosphate-ribose) polymerase. Oral administration of 400 mg/kg SPGE remarkably inhibited growth and progression of prostate tumor xenografts by ∼69% in nude mice, as shown by tumor volume measurements and non-invasive real-time bioluminescent imaging. Most importantly, SPGE did not cause any detectable toxicity to rapidly dividing normal tissues such as gut and bone marrow. This is the first report to demonstrate the in vitro and in vivo anticancer activity of sweet potato greens in prostate cancer.

  11. Chemistry mutagenesisin vitroand characteristics of mutants in sweet potato%甘薯化学离体诱变及突变体的性状表现

    Institute of Scientific and Technical Information of China (English)

    张丹丹; 王维华; 李冠; 隋炯明; 乔利仙; 王晶珊; 姜德锋

    2016-01-01

    The stem tips of sweet potato cultivar ‘Yanshu 25’ were cultured on the mutagenic medium supple-mented with pingyangmycin (PYM) for 4 weeks. The formed calli were transferred to the induction medium without PYM until the shoots were formed. The shoots above 2 cm were further transferred to the MS basal medium for whole plant formation. The formed plants were transplanted in the ifeld after acclimation in the plastic house. Three mutants were obtained after harvest: one mutant (P-1) produced storage roots having smooth skin and with no reinforced stripes on the surface; another (P-2) showed minor reinforced stripes on the storage root skin, while the storage roots of mutagenic parent ‘Yanshu 25’ have major reinforced stripes on the surface. The third one (P-3) produced storage roots with purple skin, lfesh, vines, and still having major rein-forced stripes on the surface. In the second generation, the storage roots of P-1 offspring have not reinforced stripes, and no separation was observed. While segregation was observed among the P-2 offsprings, some off-springs produced storage roots with minor reinforced stripes, and others produced storage roots with major re-inforced stripes on the surface. The average fresh weights per plant of P-1 and P-2 offsprings were signiifcantly higher than that of mutagenic parent respectively.%利用甘薯品种‘烟薯25’的茎尖为外植体,平阳霉素作为诱变剂添加于培养基中进行离体诱变培养。4周后,将形成的愈伤组织转移到不添加平阳霉素的诱导培养基上继续培养,直到形成不定芽。当不定芽长到2 cm以上后,从基部切下扦插于MS基本培养基上,促使其长成完整植株。将再生植株经驯化后移栽田间,收获期观察发现有3株明显发生变异,其中一株(P-1)薯块表面光滑无暴筋,另一株(P-2)暴筋很轻,而诱变亲本暴筋严重。还有一株(P-3)茎蔓、薯块皮色、肉色均突变为紫色,但仍保

  12. Application of low-cost algal nitrogen source feeding in fuel ethanol production using high gravity sweet potato medium.

    Science.gov (United States)

    Shen, Yu; Guo, Jin-Song; Chen, You-Peng; Zhang, Hai-Dong; Zheng, Xu-Xu; Zhang, Xian-Ming; Bai, Feng-Wu

    2012-08-31

    Protein-rich bloom algae biomass was employed as nitrogen source in fuel ethanol fermentation using high gravity sweet potato medium containing 210.0 g l(-1) glucose. In batch mode, the fermentation could not accomplish even in 120 h without any feeding of nitrogen source. While, the feeding of acid-hydrolyzed bloom algae powder (AHBAP) notably promoted fermentation process but untreated bloom algae powder (UBAP) was less effective than AHBAP. The fermentation times were reduced to 96, 72, and 72 h if 5.0, 10.0, and 20.0 g l(-1) AHBAP were added into medium, respectively, and the ethanol yields and productivities increased with increasing amount of feeding AHBAP. The continuous fermentations were performed in a three-stage reactor system. Final concentrations of ethanol up to 103.2 and 104.3 g l(-1) with 4.4 and 5.3 g l(-1) residual glucose were obtained using the previously mentioned medium feeding with 20.0 and 30.0 g l(-1) AHBAP, at dilution rate of 0.02 h(-1). Notably, only 78.5 g l(-1) ethanol and 41.6 g l(-1) residual glucose were obtained in the comparative test without any nitrogen source feeding. Amino acids analysis showed that approximately 67% of the protein in the algal biomass was hydrolyzed and released into the medium, serving as the available nitrogen nutrition for yeast growth and metabolism. Both batch and continuous fermentations showed similar fermentation parameters when 20.0 and 30.0 g l(-1) AHBAP were fed, indicating that the level of available nitrogen in the medium should be limited, and an algal nitrogen source feeding amount higher than 20.0 g l(-1) did not further improve the fermentation performance.

  13. Ileal digestibility of amino acids of cassava, sweet potato, cocoyam and erythrina foliages fed to growing pigs.

    Science.gov (United States)

    Régnier, C; Jaguelin, Y; Noblet, J; Renaudeau, D

    2012-04-01

    Ileal digestibility in growing pigs fed starch-based diets with inclusion of four tropical leaves in a meal form was studied in a 5 × 5 Latin square design. Five diets were formulated with only casein as protein source in the basal diet (CAS), and casein plus dry cassava (CA) leaves, casein plus dry sweet potato (SP) leaves, casein plus dry cocoyam (CO) leaves and casein plus erythrina (ER) leaves in the other four diets. All diets contained the same amount of CP (14%), either provided by only CAS or a combination of casein and 250 g of leaf meal per kg of diet in the other diets. Leaves were separated manually from stems, and only the leaf part was used. A protein-free diet was fed during a sixth period in order to estimate the endogenous protein losses and calculate the CP- and amino-acid (AA)-standardized ileal digestibility (SID) values. The values for the foliages were calculated according to the difference method, assuming no interaction between the foliage and the casein. The ileal tract apparent digestibility of CP, organic matter and energy was higher in diet CAS than in the other diets (P leaves. Accordingly, the SID of lysine was highest (0.538) for CO leaves and lowest (0.126) in ER leaves; intermediate values were measured for CA and SP leaves. These low SID values in foliage meals must be related to the high levels of dietary fibre and the presence of secondary metabolites (tannins). These results suggest that it is only possible to replace a fraction of the conventional protein sources such as soyabean meal by tropical foliages in growing pig diets with a preference for CO leaves.

  14. Polar biophenolics in sweet potato greens extract synergize to inhibit prostate cancer cell proliferation and in vivo tumor growth.

    Science.gov (United States)

    Gundala, Sushma R; Yang, Chunhua; Lakshminarayana, N; Asif, Ghazia; Gupta, Meenakshi V; Shamsi, Shahab; Aneja, Ritu

    2013-09-01

    Polyphenolic phytochemicals present in fruits and vegetables indisputably confer anticancer benefits upon regular consumption. Recently, we demonstrated the growth-inhibitory and apoptosis-inducing properties of polyphenol-rich sweet potato greens extract (SPGE) in cell culture and in vivo prostate cancer xenograft models. However, the bioactive constituents remain elusive. Here, we report a bioactivity-guided fractionation of SPGE based upon differential solvent polarity using chromatographic techniques that led to the identification of a remarkably active polyphenol-enriched fraction, F5, which was ~100-fold more potent than the parent extract as shown by IC50 measurements in human prostate cancer cells. High-performance liquid chromatography-ultraviolet and mass spectrometric analyses of the seven SPGE fractions suggested varying abundance of the major phenols, quinic acid (QA), caffeic acid, its ester chlorogenic acid, and isochlorogenic acids, 4,5-di-CQA, 3,5-di-CQA and 3,4-di-CQA, with a distinct composition of the most active fraction, F5. Subfractionation of F5 resulted in loss of bioactivity, suggesting synergistic interactions among the constituent phytochemicals. Quantitative analyses revealed a ~2.6- and ~3.6-fold enrichment of QA and chlorogenic acid, respectively, in F5 and a definitive ratiometric relationship between the isochlorogenic acids. Daily oral administration of 400mg/kg body wt of F5 inhibited growth and progression of prostate tumor xenografts by ~75% in nude mice, as evidenced by tumor volume measurements and non-invasive real-time bioluminescence imaging. These data generate compelling grounds to further examine the chemopreventive efficacy of the most active fraction of SPGE and suggest its potential usefulness as a dietary supplement for prostate cancer management.

  15. Method for Extracting Genomic DNA from Leaves of Sweet-potato%甘薯叶片基因组DNA提取方法

    Institute of Scientific and Technical Information of China (English)

    黄艳岚; 张超凡

    2011-01-01

    针对甘薯叶片富含多糖、多酚、色素等物质的特点,以新鲜幼嫩甘薯叶片为材料,采用改良CTAB法提取基因组DNA,并对DNA进行电泳检测和AFLP分析.结果表明:使用改良CTAB法从32份甘薯叶片中提取基因组DNA,其纯度高、质量好、相对分子量大,多糖和多酚类等杂质去除比较完全,且OD/OD值>2.0,OD/OD值在1.8~2.0之间.无降解现象,能被限制性内切酶完全消化;用E-ACA和M-CTG引物组合进行AFLP分析,条带清晰,多态性好,此方法提取的甘薯叶片基因组DNA完全适于AFLP分析.%The leaf of sweet-potato is rich in polysaccharides, polyphenols and pigments. etc.. The genomic DNA samples of young fresh leaves of sweet-potato were isolated by improved CTAB method. and then the agarose gel electrophoresis and the AFLP analysis were conducted to it. The results showed that each sample of the genomic DNA extracted from 32 leaf samples of sweet-potato by improved CTAB method has some good characters as follows: high purity, good quality, relatively high molecular weight, comparatively clean in removing polysaccharides and polyphenols;the value of OD260/OD230 was higher than 2.0, the value of OD26O/OD28O was between 1.8 to 2.0; non-degradation, and it suitahle for digestion by restriction enzyme. Using primer comhination of E-ACA and M-CTG to do AFLP analysis, and the results showed the genomic DNA has clear bands and good polymorphism. Therefore, the genomic DNA. which is extracted from sweet-potato leaf by this improved CTAB method, is entirely suitahle for the AFLP analysis.

  16. A Leaf-Inhabiting Endophytic Bacterium, Rhodococcus sp. KB6, Enhances Sweet Potato Resistance to Black Rot Disease Caused by Ceratocystis fimbriata.

    Science.gov (United States)

    Hong, Chi Eun; Jeong, Haeyoung; Jo, Sung Hee; Jeong, Jae Cheol; Kwon, Suk Yoon; An, Donghwan; Park, Jeong Mee

    2016-03-01

    Rhodococcus species have become increasingly important owing to their ability to degrade a wide range of toxic chemicals and produce bioactive compounds. Here, we report isolation of the Rhodococcus sp. KB6, which is a new leaf-inhabiting endophytic bacterium that suppresses black rot disease in sweet potato leaves. We determined the 7.0 Mb draft genome sequence of KB6 and have predicted 19 biosynthetic gene clusters for secondary metabolites, including heterobactins, which are a new class of siderophores. Notably, we showed the first internal colonization of host plants with Rhodococcus sp. KB6 and discuss its potential as a biocontrol agent for sustainable agriculture.

  17. Ultrasound Assisted Preparation of Cold Water Soluble Sweet Potato Starch%超声波辅助制备冷水可溶性甘薯淀粉

    Institute of Scientific and Technical Information of China (English)

    成纪予; 庞林江; 陆国权

    2015-01-01

    Sweet potato starch was utilized as the raw material,and ethanol -alkali method assisted by ultra-sound was used to prepare cold water soluble sweet potato starch in the paper.The effects of starch concentration, ethanol concentration,sodium hydroxide dosage,ultrasonic power and ultrasonic time on the solubility of the final product were investigated.Based on the single factor experiments results,the preparation conditions were optimized through the Box -Behnken response surface method.The best preparation conditions were starch concentration 4.0 g/100 mL,ethanol concentration 81%,ultrasonic power 300 W and ultrasonic time 22 min.The validated solubility of cold water soluble sweet potato starch reached 96.38%,and the relative error between estimating data of regressive model and actual data was less than 1% on the best extraction conditions.The results indicated that ultrasound had application prospects in the preparation of cold water soluble sweet potato starch.%以甘薯淀粉为原料,采用超声波辅助乙醇碱法制备颗粒状冷水可溶性甘薯淀粉,系统研究了淀粉乳浓度、乙醇浓度、碱用量、超声波功率和超声波时间对冷水可溶淀粉溶解度的影响。在单因素试验基础上,通过 Box -Behnken 响应面优化制备条件,得到最佳的反应条件为:淀粉乳质量浓度4.0 g/100 mL,乙醇体积分数81%,超声波功率为300 W,超声时间22 min。经验证,在最佳条件下,所制得的甘薯淀粉溶解度达到96.38%,回归模型预测值与实测值的相对误差<1%。研究结果表明,超声波在制备冷水可溶性甘薯淀粉方面有一定的应用前景。

  18. Growth, Yield, and Nutritional Responses of Chamber-Grown Sweet Potato to Elevated Carbon Dioxide Levels Expected Across the Next 200 Years

    Science.gov (United States)

    Czeck, B. C.; Jahren, H.; Deenik, J. L.; Crow, S. E.; Schubert, B.; Stewart, M.

    2012-12-01

    Understanding the effects of increasing atmospheric carbon dioxide (CO2) concentrations on crops will be critical to assuring that sufficient food is available to the world's growing population. Previous work has shown that slightly elevated CO2 levels (CO2 = 550-700 ppm) increase the economic yield of most crops by ~33%, on average. The majority of these studies have focused on rice, wheat, and soybean; however, climate change is expected to have greatest impact on regions of the world that rely heavily on root crops, such as sweet potato (Ipomoea batatas). Sweet potato is cultivated in more than 100 developing countries; it is ranked seventh in world crop statistics and can produce more edible energy per hectare and per day than wheat, rice or cassava. In order to quantify the effect that rising CO2 levels will have on sweet potato, we grew a total of 64 sweet potato plants to maturity in large controlled growth chambers at ambient, 760, 1,140, and 1,520-ppm CO2 levels. At planting, initial measurements (of mass, length, and number of nodes) for each plant were recorded. Throughout the duration of the experiment (90 days) measurements (of stem length, and number of leaves) were recorded every 7 to 14 days. To ensure optimum growing conditions moisture content was monitored using soil tensiometers; temperature, relative humidity and CO2 concentrations were recorded every ten minutes. Half the plants were supplemented with an inorganic fertilizer and the other half with an organic fertilizer to test the effect of nutrient availability on biomass production under elevated CO2 levels. After 3 months of growth, we measured fresh and dry biomass of all above- and below-ground tissues. Results showed a substantial increase in both above- and below-ground biomass at elevated levels of CO2. For the organic treatment, a 43% increase in aboveground dry biomass at the highest CO2 concentration (1520ppm) was found; the inorganic treatment showed a 31% increase. The

  19. 中国甘薯淀粉产业发展现状与前景展望%Situation and Prospect of Sweet Potato Starch Processing Industry in China

    Institute of Scientific and Technical Information of China (English)

    戴起伟; 钮福祥; 孙健; 曹静

    2015-01-01

    The current status and problems of sweet potato starch processing industry in China were analyzed and the development countermeasures and prospects were also put forward in this paper. At present, the processing method of sweet potato starch in China is still in the family-style small workshop, the small and medium-sized enterprises machinery processing, while the large enterprise with mechanized automation processing is in developing. Shandong and Henan as well as other provinces are the sweet potato starch production concentrated areas. The restricting factors in the development of sweet potato starch industry mainly included technology backward, high energy consumption, big environmental pollution, low rate of comprehensive utilization for by-product, etc.. The development of sweet potato starch processing industry in the future should be strived to promote large-scale and intensive, to fundamentally change the way of small and scattered processing, meanwhile, to further strengthen the high sweet potato starch variety breeding and special machinery innovation and technology research for sweet potato starch processing, to highly improve the efficiency of sweet potato starch processing and to raise the economic output.%对中国当前甘薯淀粉加工产业现状和问题进行了分析,提出了发展对策和前景展望。目前中国甘薯淀粉加工方式仍然以家庭作坊式、中小型企业机械加工为主,大型企业自动化加工已开始起步。山东、河南等省是目前中国甘薯淀粉生产比较集中的地区。影响甘薯淀粉产业发展的主要制约因素是技术工艺落后、能耗高、环境污染大、副产物综合利用率低等。今后甘薯淀粉产业发展应着力推进规模化、集约化,从根本上改变小而散的加工方式,同时加强高淀粉甘薯品种选育及专用型甘薯淀粉加工机械研制与工艺创新,进一步提高甘薯淀粉加工产出率和经济效益。

  20. Physical Characteristics of White Sweet Potato (Ipomoea batatas L.), Rice (Oryza sativa L.), and Tapioca (Manihot esculenta) Flours - Based Seasoning Composite Flour

    Science.gov (United States)

    Alfani, NNA; Ishartani, D.; Anam, C.; Praseptiangga, D.; Manuhara, G. J.

    2017-04-01

    The objective of this study was to determine the physical characteristics of seasoning composite flour that made from white sweet potato, rice, and tapioca flours, and determined the best formula of seasoning composite flour. A completely randomized design (CRD) with formula as the single factor was used. The data were analyzed by one-way ANOVA method and followed by Duncan Multiple Range Test (DMRT) at significance 5% if there was a significant difference. The best formula of seasoning composite flour was 30% tapioca flour, 30% rice flour, and 40% white sweet potato flour. The physical characteristics of the best formula were 5.689 ml/g of swelling power, 2.681 g/g of water absorption capacity, 0.887 ml/g of oil absorption capacity, and 22.03% cooking loss. Physical characteristics of the best seasoning composite flour were significantly different from the commercial seasoning flour and showed a better cooking loss, oil absorption capacity, and swelling power than commercial seasoning flour.

  1. Kinetics of potassium release in sweet potato cropped soils: a case study in the highlands of Papua New Guinea

    Science.gov (United States)

    Rajashekhar Rao, B. K.

    2015-02-01

    The present study attempts to employ potassium (K) release parameters to identify soil-quality degradation due to changed land use patterns in sweet potato (Ipomoea batatas (L.) Lam) farms of the highlands of Papua New Guinea. Rapid population increase in the region increased pressure on the land to intensify subsistence production mainly by reducing fallow periods. Such continuous cropping practice coupled with lack of K fertilization practices could lead to a rapid loss of soil fertility and soil-resource degradation. The study aims to evaluate the effects of crop intensification on the K-release pattern and identify soil groups vulnerable to K depletion. Soils with widely differing exchangeable and non-exchangeable K contents were sequentially extracted for periods between 1 and 569 h in 0.01 M CaCl2, and K-release data were fitted to four mathematical models: first order, power, parabolic diffusion and Elovich equations. Results showed two distinct parts in the K-release curves, and 58-80% of total K was released to solution phase within 76 h (first five extractions) with 20-42% K released in the later parts (after 76 h). Soils from older farms that were subjected to intensive and prolonged land use showed significantly (P < 0.05) lower cumulative K-release potential than the farms recently brought to cultivation (new farms). Among the four equations, first-order and power equations best described the K-release pattern; the constant b, an index of K-release rates, ranged from 0.005 to 0.008 mg kg-1 h-1 in the first-order model and was between 0.14 and 0.83 mg kg-1 h-1 in the power model for the soils. In the non-volcanic soils, model constant b values were significantly (P < 0.05) higher than the volcanic soils, thus indicating the vulnerability of volcanic soils to K deficiency. The volcanic soils cropped for several crop cycles need immediate management interventions either through improved fallow management or through mineral fertilizers plus animal manures

  2. The Differentiation-and Proliferation-Inhibitory Effects of Sporamin from Sweet Potato in 3T3-L1 Preadipocytes

    Institute of Scientific and Technical Information of China (English)

    XIONG Zhi-dong; LI Peng-gao; MU Tai-hua

    2009-01-01

    The aim of this study was to investigate the effect of different concentrations of sporamin on the differentiation and proliferation of 3T3-L1 preadipocytes,providing the theoretical basis for the development of food to treat obesity and diabetes.The isolation and purification of sporamin from sweet potato species 55-2 were performed by ammonium sulphate precipitation in combination with ion-exchange and gel filtration chromatography.With berberine as a positive control,different concentrations of sporamin (0.000,0.125,0.025,0.250,0.500,and 1.000 mg mL-1) were used to treat 3T3-L1 preadipocytes.Intracellular fat accumulation and the degree of adipogenesis were quantified using Oil Red O staining and colorimetry.Preadipocytes differentiation was measured by 3-(4,5-dimethylthiazolyl-2-yl)-2,5-diphenyltetrazolium bromide (MTT)spectrophotometric assay.Two sporamin proteins,which were separated into sporamin A (31 kD) and sporamin B (22 kD),could be purified by ion-exchange and gel filtration chromatography.After being treated by different concentrations of sporamin,the differentiation of 3T3-L1 preadipocytes was significantly inhibited,compared with the positive control.When the sporamin solution concentration was 0.500 mg mL-1,the accumulation of lipid droplets within the cells was significantly decreased and the optical density (OD) value of the solution from destained Oil Red O reached to 0.35,which was the lowest value (P < 0.05).The proliferation of 3T3-L1 preadipocytes was significantly inhibited by treating at higher sporamin concentrations.In addition,the inhibitory effect was more obvious with the prolonged treatment time (P< 0.05).The differentiation and proliferation of 3T3-L1 preadipocytes could be inhibited significantly by the addition of higher concentration sporamin.It was,therefore,suggested that the sporamin was potentially effective for weight loss.

  3. 施钙对甘薯铝胁迫的缓解效应%Effects of calcium application on alleviation of aluminum stress to sweet potato

    Institute of Scientific and Technical Information of China (English)

    李清华; 刘庆; 李欢; 史衍玺

    2016-01-01

    Using the Shangshu 19 as plant material, alleviation effects of various concentration of calcium on aluminum stress of sweet potato were examined by soil culture experiment. Different levels of aluminum levels (0, 1 g/L) and calcium treatment levels (0, 0. 8, 1. 6, 2. 4 g/L) were used to study the different concentration of calcium on aluminum toxicity of sweet po-tato. The results showed that under the stress of aluminum, increased calcium supply alleviated the toxicity by aluminum, significantly weaken the aluminum stress to the root activity, calcium content in leaf and potato, the leaf chlorophyll content, PSⅡand Fv/Fm, the blade SOD and POD, the accumulation of lower malondialdehyde ( MDA) content, and improved the plant resistance to aluminum stress.%采用土培试验方法,以铝敏感型甘薯品种商薯19号为研究材料,设置不同的钙处理水平(0、0.8、1.6、2.4 g/kg),研究了钙对甘薯铝胁迫(1 g/kg)的缓解效应。结果表明:施钙可以显著促进甘薯根系的生长发育,提高叶片叶绿素含量和PSⅡ(PhotosystemⅡ)最大光化学效率(Fv/Fm),提高叶片中超氧化物歧化酶、过氧化氢酶和过氧化物酶活性,降低叶片中丙二醛的积累量。施钙可以有效提高甘薯对铝胁迫的抗逆性,有效缓解铝对甘薯的胁迫。

  4. Genetic Transformation of Sweet Potato and Its Application in Molecular Breeding%甘薯遗传转化及其在分子育种中的应用

    Institute of Scientific and Technical Information of China (English)

    杨俊; 张敏; 张鹏

    2011-01-01

    甘薯是全球重要的块根类作物,不仅为人类提供了粮食,同时也是动物饲料、淀粉及燃料乙醇等工业加工的原材料.建立甘薯遗传转化体系不仅是开展甘薯重要基因功能验证的平台,同时也是甘薯转基因分子育种的必要手段.本文对甘薯遗传转化技术的发展及应用进行了综述.%Sweet potato is an important root crop for food production world-wide and serves as raw material for the processing of feeds, starches and bioethanol in various industries. Establishment of efficient genetic transformation system in sweet potato not only provides a platform for functional verification of important genes, but also is an essential tool for molecular breeding in sweet potato improvement. This review presents the development and application of genetic transformation in sweet potato.

  5. 甘薯藤蔓漂浮育苗快繁技术研究初报%Prime report on rapid propagation technique for sweet potato seedlings using floating culture system

    Institute of Scientific and Technical Information of China (English)

    李明福

    2011-01-01

    [目的]探索优质、快速的甘薯育苗新方法,为甘薯种苗快速繁殖提供科学依据.[方法]采用漂浮育苗、固体基质育苗和土床育苗方法,观察3种育苗方式下薯苗的生长、发苗天数等相关生物学性状,并记载甘薯茎蔓的腋芽发生、叶数、苗高生长及发根情况.[结果]漂浮育苗处理甘薯茎蔓发苗时间最快(6d),成活率最高(85.0%),育苗发根数最多(9.7根),根长最长(6.2cm).[结论]甘薯茎蔓漂浮育苗具有发苗时间较快、管理成本低、薯苗壮实等特点,1个月内可达到成苗标准,在甘薯薯苗快繁中有较大的优势,值得推广应用.%[Objective]The objective of the current study was to develop a fast method for production of high quality sweet potato seedlings, and to provide scientific basis for its rapid propagation. [Method]Biological characteristics of sweet potato seedling were investigated using three different seedling cultivation methods, viz. ,floating culture system ,solid substrate culture system and soil-bed culture system. The status of growth and development of hairy.root in axillary buds of sweet potato stem were recorded. [ Result ]Culturing sweet potatoes in floating culture system showed the lowest time of sprouting (6 d), the highest survival rate (85.0%) and root number (9.7 roots), and the longest root length (6.2 cm),compared to the other systems. [Conclusion]Culturing sweet potato seedlings in floating culture system decreased sprouting time, improved the growth of seedlings and reduced the cost of management. Further, by using this technique, plantlets can be produced in one month only, which is advantageous for rapid propagation of sweet potato seedling. Floating culture system due to its time and cost saving characteristics is worth for popularization in sweet potato seedling productions.

  6. Effects of three cyclodextrins on physicochemical properties and digestibility of sweet potato starch%三种环糊精对红薯淀粉理化性质和消化性影响

    Institute of Scientific and Technical Information of China (English)

    李学红; 陈智静; 陆勇; 聂钰洪

    2016-01-01

    将α–、β–、γ–环糊精分别按照一定比例加入到红薯淀粉中,研究三种环糊精对红薯淀粉糊透光率、冻融稳定性、老化程度的影响。结果表明:随着红薯淀粉中三种环糊精用量的增加,红薯淀粉糊的透光率先增加后减小、冻融稳定性得到改善、老化程度减小。随着三种环糊精用量的增加,三种环糊精改性红薯淀粉中的直链淀粉含量呈减小趋势,快消化淀粉(RDS)含量先减小后增加,慢消化淀粉(SDS)含量先增加后减小,抗性淀粉(RS)含量先增加后减小。其中加入2%β–环糊精改性的红薯淀粉的慢消化淀粉含量最高,达到了31.09%。%Theα–,β–,γ–cyclodextrin were respectively added to sweet potato starch with acertain scale to study the effectsof threecyclodextrinson the transmittance,freeze–thaw stability,aging degree of sweet potato starch.The results showed that the transmittanceof sweet potato starch increased first and then decreased,the freeze–thaw stabilityof sweet potato starch improved,the aging degreeof sweet potato starch decreased with the increaseofcyclodextrin.The amylosecontentofmodified sweet potato starch decreased,the rapidly digestible starch(RDS) decreased first and then increased,the slowly digestible starch(SDS) increased first and then decreased,the resistant starch(RS) increased first and then decreased with the increaseofcyclodextrin.The largest slowly digestible starchcontentof sweet potato starchmodified byβ–cyclodextrin was 31.09% when thecontentof β–cyclodextrin was 2%.

  7. Effect of Heat Sterilization Methods and Storage Conditions on Cooked Sweet Potatoes Quality%热杀菌方式及储藏条件对熟制甘薯品质的影响

    Institute of Scientific and Technical Information of China (English)

    翟娅萍; 李新华

    2011-01-01

    The main subject studies effect of the heat sterilization,packaging and storage conditions on cooked sweet potatoes quality.On a high after oven sweet potatoes as raw materials in different heat sterilization,packaging and storage conditions,and its weight loss,sensory quality,aging,and microbial growth conditions were studied.The results show that the thickness of 0.12 mm vacuum bags of cooked sweet potatoes less impact on weight loss and water retention is best;cooked sweet potatoes had been frozen at-18 ℃ and stored 60 d,the bacteria and mildew counts were not exceeded;cooked sweet potatoes of 2~4 ℃ cooling stored 9 d had lower degree of gelatinization,starch degree of aging was relatively high.%主要研究了热杀菌方式、包装与储藏条件对熟制甘薯品质的影响。以经烤箱熟制后的优质甘薯为原料,在不同的热杀菌方式、包装和储藏条件下,对其失重率、感官品质、老化程度和微生物繁殖状况等进行了研究。结果表明,厚度为0.12 mm的真空包装袋对熟制甘薯失重率影响较小,保水性能最佳;熟制甘薯在-18℃冻结储藏60 d时,细菌和霉菌计数仍未超标;在2~4℃冷却储藏9 d的熟制甘薯糊化度较低,淀粉老化程度相对较高。

  8. Molecular genetic analysis of virus isolates from wild and cultivated plants demonstrates that East Africa is a hotspot for the evolution and diversification of sweet potato feathery mottle virus.

    Science.gov (United States)

    Tugume, Arthur K; Cuéllar, Wilmer J; Mukasa, Settumba B; Valkonen, Jari P T

    2010-08-01

    Sweet potato feathery mottle virus (SPFMV, genus Potyvirus) is globally the most common pathogen of cultivated sweet potatoes (Ipomoea batatas; Convolvulaceae). Although more than 150 SPFMV isolates have been sequence-characterized from cultivated sweet potatos across the world, little is known about SPFMV isolates from wild hosts and the evolutionary forces shaping SPFMV population structures. In this study, 46 SPFMV isolates from 14 wild species of genera Ipomoea, Hewittia and Lepistemon (barcoded for the matK gene in this study) and 13 isolates from cultivated sweet potatoes were partially sequenced. Wild plants were infected with the EA, C or O strain, or co-infected with the EA and C strains of SPFMV. In East Africa, SPFMV populations in wild species and sweet potato were genetically undifferentiated, suggesting inter-host transmission of SPFMV. Globally, spatial diversification of the 178 isolates analysed was observed, strain EA being largely geographically restricted to East Africa. Recombination was frequently detected in the 6K2-VPg-NIaPro region of the EA strain, demonstrating a recombination 'hotspot'. Recombination between strains EA and C was rare, despite their frequent co-infections in wild plants, suggesting purifying selection against strain EA/C recombinants. Positive selection was predicted on 17 amino acids distributed over the entire coat protein in the globally distributed strain C, as compared to only four amino acids in the coat protein N-terminus of the EA strain. This selection implies a more recent introduction of the C strain and a higher adaptation of the EA strain to the local ecosystem. Thus, East Africa appears as a hotspot for evolution and diversification of SPFMV.

  9. Study on Extraction Method of DNA from Sweet Potato Tuber%甘薯薯块DNA提取方法研究

    Institute of Scientific and Technical Information of China (English)

    张道微; 张超凡; 董芳; 黄艳岚; 张亚; 周虹

    2016-01-01

    甘薯薯块富含淀粉、酚类等物质,不利于DNA提取。为了研究甘薯薯块DNA提取的最佳方法,采用经典CTAB法、改良 CTAB法一、改良 CTAB法二和 SDS提取法,对甘薯薯块总DNA提取效果进行比较,以试剂盒法提取结果作对照。结果表明:采用经典CTAB提取法和SDS提取法获得的薯块DNA含有较多杂质,且降解严重,样品质量低;CTAB改良法一能降低DNA样品中多糖等物质的含量,但DNA存在一定程度降解,且耗时较长;CTAB改良法二提取效果最佳,杂质含量低且DNA降解少,与试剂盒提取效果最接近,是一种较为理想的甘薯薯块DNA提取方法。%Potato tuber is rich in starch, phenol and other substances, which is not conducive to DNA extraction. In order to study the best extraction method of sweet potato tuber DNA, using the classical CTAB method, improved CTAB method-1, improved CTAB method-2 and SDS extraction method, to compare the sweet potato tuber total DNA extraction effect, use the extraction result of kit method as control. The results show that the classic CTAB extraction method and SDS extraction method contains more impurities, serious degradation and the quality of sample is low; the improved CTAB method-1 can reduce the content of polysaccharide and other substances in DNA samples, but DNA has a certain degree of degradation, and it consumes too much time; the improved CTAB method-2 has best extraction effect, low content of impurities and degradation of DNA, the closest extraction effect to kit method, is an ideal method for extracting DNA from sweet potato tuber.

  10. 营养保健甘薯汁制备工艺的优化%Optimization of the Preparation Technology of Nutritional Sweet Potato Juice

    Institute of Scientific and Technical Information of China (English)

    李贤宇; 李栋; 周博; 宋翔; 梁红敏

    2011-01-01

    目的:优化营养保健甘薯汁的制备工艺.方法:本研究以甘薯为原料,在加酶量、作用时间、反应温度、pH及底物浓度五个单因素试验的基础上采用响应面分析法,以甘薯浆中还原糖量为评价指标,对耐高温α-淀粉酶酶解甘薯浆中淀粉的最佳工艺进行了研究,并利用统计学方法建立了耐高温α-淀粉酶酶解甘薯浆中淀粉的二次多项数学模型.结果:最佳酶解条件为:加酶量480U/g,作用时间90min,反应温度77℃,pH值6.0,底物浓度2.6g/10ml.结论:在最佳酶解条件下,甘薯中还原糖最大估计值为13.97345%,实测值为(13.968±0.05)%.%Objective: To optimize the preparation technology of Nutritional sweet potato juice sweet potato. Method: Based on single-factor experiments including factors such as thermostable a -amylase dosage, time, temperature, pH and substance concentration in sweet potato starch hydrolysis, the response surface methodology was adopted with reducing sugar amount as evaluating indicator to optimize the process. Results: The optimum hydrolysis parameters are enzyme dosage 480 U/g, time 90 min, temperature 77℃, pH 6.0 and substance concentration 2.6g/10ml. Conclusions: The value of reducing sugar is 13.97345 % at the optimum conditions, and the measured value is (13.968± 0.05)%.

  11. Research on the Virus-free Culture Technique of Sweet Potato Stem Apical Meristem%甘薯茎尖脱毒培养技术研究

    Institute of Scientific and Technical Information of China (English)

    陈玉霞; 邱建辉; 张朝臣; 刘作斌

    2016-01-01

    [目的]探讨利用甘薯茎尖分生组织获得脱毒苗以及脱毒苗鉴定的方法。[方法]以甘薯茎尖分生组织为培养对象,通过蔗糖及外源激素单因素试验研究甘薯茎尖脱毒培养技术。[结果]甘薯茎尖分生组织生长培养基为MS+6-BA 0.50 mg/L+ NAA 0.10 mg/L+蔗糖40 g/L+琼脂6.5 g/L,试管苗生根培养基为1/2MS+NAA 0.20 mg/L+蔗糖20 g/L+琼脂6.5 g/L。在茎尖生长培养基上对25个甘薯品种的茎尖分生组织进行培养,结果表明,8个品种的出苗率为50.0%~79.3%,16个品种的出苗率达80.0%以上,其中,5个品种的出苗率为100.0%。在生根培养基上,试管苗生根率达100%,根多而粗壮,茎叶生长旺盛。试管苗不用炼苗,可直接从培养瓶中移栽至细河沙中,成活率达100%。以巴西牵牛作为指示植物,采用靠接法对试管苗进行脱毒鉴定,脱毒率为79.1%。[结论]该研究为甘薯茎尖脱毒苗生产提供适宜的培养基配方和简便易行的脱毒苗鉴定技术。%[ Objective] The production of virus-free sweet potato plantlets by means of stem apical meristem-culturing and its identification method were researched. [ Method] To explore the technique of sweet potato stem apical meristem culturing, the single factor experiment in the sucrose and exogenous hormone added in MS medium was conducted. [ Result] The medium for plantlet regeneration was MS + BA 0. 5 mg/L + NAA 0. 10 mg/L + sucrose 40 g/L + agar 6. 5 g/L and the medium of plantlet rooting in vitro was 1/2MS+NAA 0. 20 mg/L su-crose 20 g/L+ agar 6. 5 g/L. 25 sweet potato varieties were cultured in the growth medium and the results showed that the rate of plantlet of 8 varieties was 50% -79. 3%;16 varieties, more than 80. 0% and 5 varieties, up to 100%. In the rooting medium, the rooting rate of plant-lets was 100% and the root system was strong and with more roots. The stem and leaf of plantlets vigorously grew. The plantlets could be di-rectly transplanted into fine sand and

  12. A food-based approach introducing orange-fleshed sweet potatoes increased vitamin A intake and serum retinol concentrations in young children in rural Mozambique.

    Science.gov (United States)

    Low, Jan W; Arimond, Mary; Osman, Nadia; Cunguara, Benedito; Zano, Filipe; Tschirley, David

    2007-05-01

    Vitamin A deficiency is widespread and has severe consequences for young children in the developing world. Food-based approaches may be an appropriate and sustainable complement to supplementation programs. Orange-fleshed sweet potato (OFSP) is rich in beta-carotene and is well accepted by young children. In an extremely resource poor area in Mozambique, the effectiveness of introduction of OFSP was assessed in an integrated agriculture and nutrition intervention, which aimed to increase vitamin A intake and serum retinol concentrations in young children. The 2-y quasi-experimental intervention study followed households and children (n = 741; mean age 13 mo at baseline) through 2 agricultural cycles. In y 2, 90% of intervention households produced OFSP, and mean OFSP plot size in intervention areas increased from 33 to 359 m(2). Intervention children (n = 498) were more likely than control children (n = 243) to eat OFSP 3 or more d in the last wk (55% vs. 8%, P Africa.

  13. Effect of thermal and chemical modifications on the mechanical and release properties of paracetamol tablet formulations containing corn, cassava and sweet potato starches as filler-binders

    Institute of Scientific and Technical Information of China (English)

    Mariam; Vbamiunomhene; Lawal; Michael; Ayodele; Odeniyi; Oludele; Adelanwa; Itiola

    2015-01-01

    Objective: To investigate the effects of acetylation and pregelatinization of cassava and sweet potato starches on the mechanical and release properties of directly compressed paracetamol tablet formulations in comparison with official corn starch.Methods: The native starches were modified by acetylation and pregelatinization. The tablets were assessed using friability(Fr), crushing strength(Cs), disintegration time(Dt) and dissolution parameters. Results: Starch acetylation produced paracetamol tablets that were stronger and had the best balance of mechanical and disintegration properties, while pregelatinization produced tablets that were more friable but had a better overall strength in relation to disintegration than formulations made from natural starches. Correlations mainly existed between Dt and the dissolution parameters t80, t2 and k1 in the formulations. Conclusions: Modification of the experimental starches improved the mechanical and release properties of directly compressed paracetamol tablet formulations. Thus, they can be developed for use as pharmaceutical excipients in specific formulations.

  14. Effect of thermal and chemical modiifcations on the mechanical and release properties of paracetamol tablet formulations containing corn, cassava and sweet potato starches as ifller-binders

    Institute of Scientific and Technical Information of China (English)

    Mariam Vbamiunomhene Lawal; Michael Ayodele Odeniyi; Oludele Adelanwa Itiola

    2015-01-01

    Objective:To investigate the effects of acetylation and pregelatinization of cassava and sweet potato starches on the mechanical and release properties of directly compressed paracetamol tablet formulations in comparison with official corn starch. Methods: The native starches were modified by acetylation and pregelatinization. The tablets were assessed using friability (Fr), crushing strength (Cs), disintegration time (Dt) and dissolution parameters. Results: Starch acetylation produced paracetamol tablets that were stronger and had the best balance of mechanical and disintegration properties, while pregelatinization produced tablets that were more friable but had a better overall strength in relation to disintegration than formulations made from natural starches. Correlations mainly existed between Dt and the dissolution parameters t80, t2 and k1 in the formulations. Conclusions:Modification of the experimental starches improved the mechanical and release properties of directly compressed paracetamol tablet formulations. Thus, they can be developed for use as pharmaceutical excipients in specific formulations.

  15. Response of vegetation to carbon dioxide. Growth, yield and plant water relationships in sweet potatoes in response to carbon dioxide enrichment 1986

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1998-08-01

    In the summer of 1985, under the joint program of US Department of Energy, Carbon Dioxide Division, and Tuskegee University, experiments were conducted to study growth, yield, photosynthesis and plant water relationships in sweet potato plants growth in an enriched CO{sub 2} environment. The main experiment utilized open top chambers to study the effects of CO{sub 2} and soil moisture on growth, yield and photosynthesis of field-grown plants. In addition, potted plants in open top chambers were utilized in a study of the effects of different CO{sub 2} concentrations on growth pattern, relative growth rate, net assimilation rate and biomass increment at different stages of development. The interaction effects of enriched CO{sub 2} and water stress on biomass production, yield, xylem potential, and stomatal conductance were also investigated. The overall results of the various studies are described.

  16. Contents and Viscosity Properties of Extracted Starches from Different Parts of Fresh Sweet Potato Tubers%甘薯不同部位淀粉的组成及黏度特性研究

    Institute of Scientific and Technical Information of China (English)

    贾延宇; 师玉忠; 田丰贺; 张宝宝; 靳卫娜

    2011-01-01

    The distribution of starches in sweet potato (Ipomoea batatas L. ) tuber was studied. A fresh sweet potato tuber was cut into six equivalent parts, and then the extraction contents and viscosity properties of starches from different parts were determined. The results showed that the extraction content of starch from the middle section of sweet potato was lower than that from the head and the end section, and the extraction content from the inner layer was higher than that from the outer layer. The extraction contents of starch from the inner-end part and the outer-middle part of sweet potato were 16. 2% and 10. 3%, respectively. The amylose content was relatively higher in the middle section and outer layer of sweet potato tubers. The amylose contents in the outer-middle part and the inner-end part of sweet potato tubers were 29. 5% and 26. 7% respectively. The viscosity properties of starches from different parts of sweet potato tubers were different from each other. The peak viscosity and final viscosity of the starch from the head and the end sections were similar and obviously higher than the middle section, and those from the inner layer were higher than the outer layer. The composition and viscosity characteristics of starch were significantly different among different parts of sweet potato, and sweet potato starch with different characteristics and use could be produced by taking sub-site precision machining method.%为了研究甘薯块根中淀粉的分布规律,将鲜甘薯切分成质量相近的6个部位,测定了不同部位的淀粉含量、淀粉中直链淀粉含量以及淀粉黏度特性.结果显示:鲜甘薯中淀粉含量的分布特点是:尾段>头段>中段,内层>外层,尾内部位的淀粉提取量达到16.2%,中外部位的淀粉提取量为10.3%;直链淀粉含量的分布特点是:中段>头段>尾段,外层>内层,中外部位淀粉中,直链淀粉含量达到29.5%,尾内为26.7%;头尾两段中淀粉的峰值

  17. Water-Deficit Tolerance in Sweet Potato [Ipomoea batatas (L. Lam.] by Foliar Application of Paclobutrazol: Role of Soluble Sugar and Free Proline

    Directory of Open Access Journals (Sweden)

    Suravoot Yooyongwech

    2017-08-01

    Full Text Available The objective of this study was to elevate water deficit tolerance by improving soluble sugar and free proline accumulation, photosynthetic pigment stabilization, photosynthetic abilities, growth performance and storage root yield in sweet potato cv. ‘Tainung 57’ using a foliar application of paclobutrazol (PBZ. The experiment followed a Completely Randomized Block Design with four concentrations of PBZ: 0 (control, 17, 34, and 51 μM before exposure to 47.5% (well irrigation, 32.3% (mild water deficit or 17.5% (severe water deficit soil water content. A sweet potato cultivar, ‘Japanese Yellow’, with water deficit tolerance attributes was the positive check in this study. Total soluble sugar content (sucrose, glucose, and fructose increased by 3.96-folds in ‘Tainung 57’ plants treated with 34 μM PBZ grown under 32.3% soil water content (SWC compared to the untreated plants, adjusting osmotic potential in the leaves and controlling stomatal closure (represented by stomatal conductance and transpiration rate. In addition, under the same treatment, free proline content (2.15 μmol g-1 FW increased by 3.84-folds when exposed to 17.5% SWC. PBZ had an improved effect on leaf size, vine length, photosynthetic pigment stability, chlorophyll fluorescence, and net photosynthetic rate; hence, delaying wilting symptoms and maintaining storage root yield (26.93 g plant-1 at the harvesting stage. A positive relationship between photon yield of PSII (ΦPSII and net photosynthetic rate was demonstrated (r2 = 0.73. The study concludes that soluble sugar and free proline enrichment in PBZ-pretreated plants may play a critical role as major osmoprotectant to control leaf osmotic potential and stomatal closure when plants were subjected to low soil water content, therefore, maintaining the physiological and morphological characters as well as storage root yield.

  18. Zinc, copper, or cerium accumulation from metal oxide nanoparticles or ions in sweet potato: Yield effects and projected dietary intake from consumption.

    Science.gov (United States)

    Bradfield, Scott J; Kumar, Pawan; White, Jason C; Ebbs, Stephen D

    2017-01-01

    The potential release of metal oxide engineered nanoparticles (ENP) into agricultural systems has created the need to evaluate the impact of these materials on crop yield and food safety. The study here grew sweet potato (Ipomoea batatas) to maturity in field microcosms using substrate amended with three concentrations (100, 500 or 1000 mg kg DW(-1)) of either nZnO, nCuO, or nCeO2 or equivalent amounts of Zn(2+), Cu(2+), or Ce(4+). Adverse effects on tuber biomass were observed only for the highest concentration of Zn or Cu applied. Exposure to both forms of Ce had no adverse effect on yield and a slight positive benefit at higher concentrations on tuber diameter. The three metals accumulated in both the peel and flesh of the sweet potato tubers, with concentrations higher in the peel than the flesh for each element. For Zn, >70% of the metal was in the flesh and for Cu >50%. The peels retained 75-95% of Ce in the tubers. The projected dietary intake of each metal by seven age-mass classes from child to adult only exceeded the oral reference dose for chronic toxicity in a scenario where children consumed tubers grown at the highest metal concentration. The results throughout were generally not different between the ENP- and ionic-treatments, suggesting that the added ENPs underwent dissolution to release their component ions prior to accumulation. The results offer insight into the fate and impact of these ENPs in soils. Copyright © 2016 Elsevier Masson SAS. All rights reserved.

  19. Photoautotrophic Growth and Net Photosynthetic Rate of Sweet Potato Plantlets In Vitro as Affected by the Number of Air Exchanges of the Vessel and Type of Supporting Material

    Institute of Scientific and Technical Information of China (English)

    XIAO Yulan; Kozai Toyoki

    2006-01-01

    To produce high-quality sweet potato plantlets rapidly at low production costs, single nodal leafy cuttings of sweet potato (Ipomoea batatas (L.) Lam.) plantlets were cultured in vitro for 14 days on sugar- and phytohormone-free Murashige and Skoog (MS) liquid medium, at a photosynthetic photon flux (PPF) of 200 μmol·m-2·s-1 and a CO2 concentration (v/v) of 1.8×10-3. A factorial experiment was conducted with two levels of the number of air exchanges of the vessel (NAE), 8.7-12.2 h-1 and >12.2 h-1, and two types of supporting material, vermiculite and Florialite (a porous material). The control treatment consisted of a photomixotrophic culture using a sugar- and NAA-containing agar MS medium with an NAE of 2.4 h-1. PPF and CO2 concentrations were the same as the photoautotrophic treatments. In comparison with the control treatment, the photoautotrophic treatments with NAE of 8.7-12.2 h-1 (MF treatment) and ≥12.2 h-1 (HF treatment) were, respectively, 2.2 and 2.8 times in dry weight, and 3.7 and 4.2 times in net photosynthetic rate, when Florialite was used. The survival percentages of the plantlets in the field were, respectively, 86% and 97% in the MF and HF treatments, and 35% and 46% higher than that in the control treatment. The plantlets cultured with Florialite showed greater growth, compared with those cultured with vermiculite. Photoautotrophic micropropagation system with high NAE and the use of porous supporting material can produce high-quality plantlets and make it possible to reduce production costs.

  20. Plastid Inheritance in Sweet Potato as Revealed by DNA Restriction Fingerprinting%甘薯质体遗传方式的DNA指纹图谱分析

    Institute of Scientific and Technical Information of China (English)

    方晓华; 张方; 吴乃虎; 胡适宜

    2003-01-01

    用DNA指纹图谱分析了甘薯(Ipomoea batatas Lam.)徐薯18和AB78-1品系及它们的正反交子代叶绿体DNA,结果显示子代叶绿体DNA指纹均与母本相同,而未发现与父本或双亲相同的指纹图谱,因此在该杂交组合中质体遗传方式为母系遗传.这个结论与先前根据细胞学研究所推测的甘薯质体遗传方式不同,表明旋花科植物可能并不存在一个一致的父系或双亲质体传递模式.DNA指纹图谱分析用于质体遗传的研究尚未见报道,本文对其优越性进行了讨论.%The inheritance of chloroplast DNA (cpDNA) in sweet potato ( Ipomoea batatas Lam. ) was analyzed using DNA restriction fingerprinting. The cpDNA fingerprints of hybrids from reciprocal crosses between Xushul8 and AB78-1 were found to be identical to those of their female parents, which reveals that cpDNA of sweet potato is maternally inherited in this intervarietal crossing. This maternal cpDNA transmission pattern does not accord with the putative one based on former cytological studies. The plastid inheritance in Convolvulaceae has been briefly reviewed in this study, and the utility of DNA restriction fingerprinting analysis in the study of plastid inheritance is also discussed.

  1. The Bioactivity and Safety to Sweet Potato of Several Soil Treatment Herbicides%几种土壤处理除草剂室内生物活性及对甘薯的安全性测定

    Institute of Scientific and Technical Information of China (English)

    张勇; 张成玲; 路兴涛; 刘震; 马士仲; 马冲

    2012-01-01

    [Methods] The activity and the safety of 8 herbicides to sweet potato were studied in laboratory in order to investigate the feasibility of application in sweet potato field with soil treatment. [Results] All 8 herbicides showed high herbicidal activity to redroot amaranth and barnyardgrass. The selectivity coefficient of metolachlor, pendimethalin, trifluralin, acetochlor, butralin and clomazone were 6.15, 5.78, 3.04, 2.57, 2.29 and 2.19, respectively, and they were safe to sweet potato. Selectivity coefficient of oxadiazon and prometryn were 0.70 and 1.24 respectively, and they were unsafe to sweet potato. [Conclusions] Metolachlor, pendimethalin, trifluralin, acetochlor, butralin and clomazone can be carried out in field experiment further to be determine the feasibility of application in sweet potato fields. Prometryn and oxadiazon were not suitable to use in sweet potato fields.%[方法]采用室内盆栽法和土壤处理法测定8种药剂的活性及对甘薯的安全性.[结果]供试的8种药剂对反枝苋及稗草均具有较高除草活性;异丙甲草胺、二甲戊灵、氟乐灵、乙草胺、仲丁灵、异(噁)草松6种药剂的选择性系数分别为6.15、5.78、3.04、2.57、2.29、2.19,安全性好;(噁)草酮和扑草净选择性系数为0.70、1.24,安全性差.[结论]异丙甲草胺、二甲戊灵、氟乐灵、乙草胺、仲丁灵及异(噁)草松可以开展田间试验,进一步确定在甘薯田应用的可行性,扑草净和(噁)草酮不宜在甘薯田应用.

  2. Novas variedades de pimentão resistentes ao mosaico causado por virus Y New lines of sweet pepper resistant to strains of potato Y virus

    Directory of Open Access Journals (Sweden)

    Hiroshi Nagai

    1971-05-01

    Full Text Available Novas variedades de pimentão denominadas "Agronômico 9" e "Agronômico 10" foram obtidas de cruzamentos múltiplos, em que tomaram parte as variedades de pimentão Casca Dura (Casca Grossa, Mogi das Cruzes, Porto Rico Wonder, Moura, Ikeda, Yolo Wonder e Modestão, além de uma pimenteira P 11 (P.I. 264281. Cada uma dessas variedades contribuiu com respectivos genes de resistência às estirpes Yn, Yw, Yf, Yat do complexo PVY e mais hipersensibilidade ao TMV. "Agronômico 9" produz frutos quadrados (tipo California Wonder e "Agronômico 10" apresenta frutos cônico-alongados (tipo Casca Dura.Breeding work carried out by the writer in the past led to the development of two new sweet pepper varieties, Agronômico 7 (California wonder type and Agronômico 8 (conical fruit, incorporating the high level of resistance to strains of potato Y virus from P 11 (P.I. 264281. The occurrence of a potato Y virus strain (Atibaia - Yat that infected these new pepper types and the fact that their fruit was considered as below the desirable market size led author to continue their improvement. Further breeding work either the two varieties was carried out, as follows: (1 Agronômico 7 was crossed with a California pepper type that has been called Modestão; selection made in advanced generations of this cross resulted in a sweet pepper type with the blocky type of fruit that combines other favorable characteristics of both parents, and has been designated as Agronômico 9; (2 A selection of Agronômico 8, resistant to the Yat strain, was crossed, with Ikeda, a variety that is tolerant to the virus and has larger fruit than the other parent. Selection in advanced generations of this cross led to Agronômico 10, that has conical fruit of a size comparable to that of Ikeda, and the very high level of resistance to potato Y virus of P 11. Agronômico 9 and 10 are being tested on a large scale at present and scheduled to be released in the future.

  3. 荷兰豆—优质稻—甘薯高产栽培技术%Pea Pods-Quality Rice-Sweet Potato High Yield Cultivation Techniques

    Institute of Scientific and Technical Information of China (English)

    王来清; 赖德才

    2012-01-01

    Pea pods-qality rce-sweet potato high yield cultivation techniques summed up through the"Whole City Money-Grain Harvest Competition"practice that launched by Sanming municipal government,was an efficient planting pattern suitable for extension in Qingliu county.High yield cultivation techniques for pea pods,high quality rice,sweet potato were briefly introduced in this paper.%荷兰豆—优质稻—甘薯高产栽培技术是三明市政府组织的全市粮钱丰收竞赛活动实践中总结出来的适应清流县推广的高效种植模式,文章就荷兰豆、优质稻、甘薯的高产栽培技术作简要介绍。

  4. 自然干燥与热风干燥对甘薯粉丝质量的影响%Effcets of Natural Drying and Hot-air Drying on Quality of Sweet Potato Vermicelli

    Institute of Scientific and Technical Information of China (English)

    周洁; 孔晓玲

    2011-01-01

    This article researches on the quality comparison of natural drying and hot air drying of sweet potato vermicelli, by the appearance of shape, swelling rate, break off rate, tensile properties . Analyses the effect of different dry methods on sweet potato vermicelli, points out the reasonable dry method of vermicelli.%对自然干燥与热风干燥的甘薯粉丝进行了质量对比,通过外观形状、膨润度、断条率、抗拉性等几个方面的观察与检测,分析了不同的干燥方法对粉丝干燥特性的影响,并给出了粉丝干燥方式的合理化建议.

  5. 2种复合肥对甘薯产量性状的影响%Effect of Different Compound Fertilizer on Yield of Sweet Potato(Ipomoea batatas L.Lam)

    Institute of Scientific and Technical Information of China (English)

    李观康; 陈胜勇; 何霭如; 余小丽; 汪云

    2014-01-01

    Different fertilizer levels of Weifang Potassium Sulphate Fertilizer and Finland Fertilizer were applied in the filed.The root fresh yield,starch content,dry matter content,vine yield and other indexes in sweet potato were determined in order to find out the effect of compound fertilizer on yield of sweet potato and the compound fertilizer utilization regular.The results showed that the fertilizer amount that the highest yield and the best benefit could be obtained in sweet potato production was applying Weifang Potassium Sulphate Fertilizer 375 kg/hm2.Weifang Potassium Sulphate Fertilizer was a new compound fertilizer and the special fertilizer for sweet potato.%以潍坊硫酸钾复合肥和芬兰复合肥的不同施肥量为处理,测定甘薯鲜薯产量、淀粉含量、干率、茎叶产量和其他主要指标,综合评价不同复合肥对甘薯产量性状的影响,找出当地甘薯生产复合肥料的利用规律,减少甘薯生产盲目施肥。结果表明:甘薯生产中最高产和最佳效益施肥量均为潍坊硫酸钾复合肥375 kg/hm2,潍坊硫酸钾复合肥这种新型复合肥可作为甘薯专用肥施用。

  6. Screening of Sweet Potato Germplasm Resources Resistant to Rot Nematode and Evaluation of Their Disease Resistance%甘薯抗茎线虫病种质资源的筛选与抗病性评价

    Institute of Scientific and Technical Information of China (English)

    孙厚俊; 赵永强; 谢逸萍; 陈晓宇; 邢继英

    2011-01-01

    对81份甘薯材料进行了茎线虫病、黑斑病和根腐病抗性鉴定和评价.结果表明:同时抗这3种病害的甘薯品种(系)较少,仅郑04-4-2和徐062826时甘薯茎线虫病抗侵入和抗扩展的同时,对黑斑病和根腐病也具有较高的抗性水平;另外有部分品种(系)如泰中7号、浙紫1号、徐060407等达到抗两病水平,可作为甘薯抗病育种的双抗亲本加以利用.%In this study, the resistances of 81 sweet potato germplasm resources to sweet potato rot nematode, black rot and root rot were identified and evaluated. The results indicated that very few sweet potato varieties (lines) could simultaneously resist these three diseases, only Zheng 04-4 -2 and Xu 062826 had high resistances not only to the invasion and expansion of rot nematode, but also to black rot and root rot. In addition, some tested resources such as Taizhong No. 7, Zhezi No. 1 and Xu 060407 had the double resistances, and they can be used as the double - resistant parents in the disease - resistant breeding of sweet potato.

  7. 几种抗旱栽培措施对甘薯生长及产量的影响%Effects of Cultivation Measures of Drought Resistance on the Growth and Yield of Sweet Potato

    Institute of Scientific and Technical Information of China (English)

    赵庆云; 杨秀莲; 杨燕; 谢世清

    2014-01-01

    Through drought-relief measures of the plastic film mulching, straw mulching, increasing fertilization, the character-istics of shoot traits, root traits and yield of sweet potato were comparatively analyzed. The results showed that the model of plastic film mulching, straw mulching had good drought resistance and high yield. Organic fertilizer can increase the yield of sweet potato, but the effect of drought propagation was not obvious. The model of plastic film mulching, straw mulching of sweet potato can be used to improve drought resistance and water retention ability to improve the yield.%通过进行甘薯地膜覆盖、稻草覆盖、增施肥料等抗旱栽培,对甘薯地上部性状、地下部性状及产量等方面进行比较分析。结果表明,甘薯地膜覆盖、稻草覆盖栽培模式具有很好的抗旱、增产效果;增施有机肥可提高甘薯产量,但抗旱效果不明显。生产上可采用地膜覆盖、稻草覆盖栽培模式来增强甘薯的抗旱保水能力,从而提高甘薯产量。

  8. Effects of feeding sweet potato (Ipomoea batatas) vines as a supplement on feed intake, growth performance, digestibility and carcass characteristics of Sidama goats fed a basal diet of natural grass hay.

    Science.gov (United States)

    Megersa, Tadesse; Urge, Mengistu; Nurfeta, Ajebu

    2013-02-01

    The objective of this study was to investigate the effects of substituting sweet potato [Ipomoea batatas (L) Lam] vines for concentrate on growth performance, digestibility, and carcass characteristics. Thirty yearling bucks (15.3 ± 1.64 kg) were assigned into six treatments in a randomized complete block design: natural grass hay alone (T1) or supplemented with 100 % sweet potato vines (SPV) (T2), 65 % SPV + 35 % concentrate (T3), 35 % SPV + 65 % concentrate (T4), and 100 % concentrate (T5) on dry matter (DM) basis. Supplemented goats (T2, T3, T4, and T5) consumed higher (p goats (349 g/day). The crude protein (CP) intake (32.0, 48.6, 54.7, and 69.2 g/day) increased with increasing levels of the concentrate in the diet for T2, T3, T4, and T5, respectively. The DM digestibility in T2, T3, T4, and T5, respectively, was higher (P goats lost weight (-19.5 g/day). Slaughter weight, empty body weight, hot carcass weight, dressing percentage, rib-eye muscle area, and total edible offals were higher (P goats compared with nonsupplemented ones. Therefore, it could be concluded that sweet potato vine can replace the conventional concentrate and could be fed with poor quality hay to prevent body weight loss of animal in the absence of other feed supplements.

  9. Utilization Status of Sweet Potato Resources in Yunxian and Its Industry Chain Extension%郧县甘薯资源利用现状及产业链条延伸思路

    Institute of Scientific and Technical Information of China (English)

    耿明仙; 李光富; 王开昌; 陈新举

    2013-01-01

    In the paper, we analyzed the utilization status, planting scale, nutritional characteristics, local dietary customs, role transition, planting cultivars and application technology of sweet potato in Yunxian. And as a green transformation and development innovation zone, Yunxian should pay attention to improving the quality of sweet potato industry, adjusting industry internal structure, forecasting development prospect and extending industrial chain, and provide more original products for consumers and improve the added value of the sweet potato by all means.%分析了郧县甘薯资源利用现状、种植规模、甘薯营养特征、地方甘薯饮食习惯、甘薯角色转换、栽培品种及技术应用等方面,提出了郧县作为绿色转型发展创新区,应围绕甘薯产业素质提升、产业内部结构调整、开发前景展望及延伸产业链条等方面,为社会提供更多的原生态产品和多途径提高甘薯附加值。

  10. Yield of sweet potato fertilized with cattle manure and biofertilizer Produção da batata-doce adubada com esterco bovino e biofertilizante

    Directory of Open Access Journals (Sweden)

    Ademar P Oliveira

    2010-09-01

    Full Text Available In Northeastern Brazil, the sweet potato is cultivated in small farms, in a family farming systems, constituting themselves an alternative way for the generation of food, employment and income. This study aimed to assess the effect of cattle manure levels and biofertilizer concentrations on the sweet potato cultivar White Queen productivity. The experiment was carried out from March to September 2007 at the EMEPA Experimental Station in Lagoa Seca, Brazil. The experimental design was randomized blocks, in split split plot 6 x 4 x 2 + 1 scheme, with four replications. The plots consisted of cattle manure levels (0, 10, 20, 30, 40 and 50 t ha-1, the subplot of biofertilizer concentrations (0, 15, 30 and 45% and the sub subplots consisted of methods of biofertilizer application, to the soil or leaves. Also, there was an additional control treatment using N, P and K mineral fertilizer. Commercial and total root productivity was evaluated. The levels of 30.8 and 31.2 t ha-1 of cattle manure were responsible for the highest commercial and total sweet potato root productivity (17.4 and 13.1 t ha-1, respectively. Biofertilizer concentrations of 29 and 28%, applied to soil and to leaves provided, respectively, the greatest productivities of total roots (15.4 and 13.1 t ha-1, whereas concentrations of 30 and 27%, also applied to soil and leaves were responsible, respectively, for the highest commercial root productivity (11 and 9.7 t ha-1.Na região Nordeste do Brasil, a batata-doce é principalmente plantada por pequenos produtores em sistema de agricultura familiar, constituindo-se numa alternativa de alimentação e geração de emprego e renda. Este trabalho teve por objetivo avaliar o efeito das doses de esterco bovino e de concentrações de biofertilizante sobre a produtividade da batata-doce, cultivar Rainha Branca. O experimento foi conduzido no período de março a setembro de 2007 na Estação Experimental da EMEPA, em Lagoa Seca-PB, Brasil. O

  11. Pneumonia intersticial em bovinos associada à ingestão de batata-doce (Ipomoea batatas mofada Interstitial pneumonia in cattle fed moldy sweet potatoes (Ipomoea batatas

    Directory of Open Access Journals (Sweden)

    Rafael A. Fighera

    2003-12-01

    Full Text Available Uma doença respiratória foi diagnosticada em cinco dentre 23 bovinos (21,7% após terem sido alimentados com batata-doce (Ipomoea batatas mofada em uma pequena propriedade rural em São Vicente do Sul, Rio Grande do Sul, Brasil. Três dos cinco bovinos afetados morreram espontaneamente, e o quarto foi sacrificado para necropsia quando mostrava sinais clínicos respiratórios avançados. A manifestação clínica iniciara cerca de 24 horas após a ingestão das batatas-doces e a evolução clínica foi de 1 a 4 dias. Os sinais clínicos incluíam dispnéia (respiração laboriosa e abdominal, taquipnéia, pescoço estendido com cabeça baixa e dilatação ritmada das narinas. Dois bovinos foram necropsiados. Os achados de necropsia incluíam pulmões distendidos, pálidos e de consistência borrachenta, que não colapsavam quando o tórax era aberto; enfisema e edema acentuados eram evidentes no pulmão. Os linfonodos e o baço apresentavam alterações características de hiperplasia linfóide. Histologica-mente, as lesões eram típicas de pneumonia intersticial. Os septos alveolares estavam espessados por fibroblastos e células inflamatórias, havia hipertrofia e hiperplasia de pneumócitos tipo II; os septos interlobulares estavam distendidos por edema e enfisema. A cultura de amostras das batatas-doces mofadas produziu Fusarium solani e F. oxysporum.Cases of respiratory disease were diagnosed in five out of 23 cattle (21.7% after they were fed moldy damaged sweet potatoes (Ipomoea batatas on a small farm in the county of São Vicente do Sul, state of Rio Grande do Sul, Brazil. Of those five cattle, three died spontaneously and another one was euthanatized for necropsy while showing advanced respiratory clinical signs. The disease manifested itself approximately 24 hours after the ingestion of the sweet potatoes and lasted from 1 to 4 days. Clinical signs included dyspnea (labored breathing and abdominal respiration, tachypnea, extended

  12. Genetic variability and evolutionary implications of RNA silencing suppressor genes in RNA1 of sweet potato chlorotic stunt virus isolates infecting sweetpotato and related wild species.

    Directory of Open Access Journals (Sweden)

    Arthur K Tugume

    Full Text Available BACKGROUND: The bipartite single-stranded RNA genome of Sweet potato chlorotic stunt virus (SPCSV, genus Crinivirus; Closteroviridae encodes a Class 1 RNase III (RNase3, a putative hydrophobic protein (p7 and a 22-kDa protein (p22 from genes located in RNA1. RNase3 and p22 suppress RNA silencing, the basal antiviral defence mechanism in plants. RNase3 is sufficient to render sweetpotato (Ipomoea batatas virus-susceptible and predisposes it to development of severe diseases following infection with unrelated virus. The incidence, strains and gene content of SPCSV infecting wild plant species have not been studied. METHODOLOGY/PRINCIPAL FINDINGS: Thirty SPCSV isolates were characterized from 10 wild Ipomoea species, Hewittia sublobata or Lepistemon owariensis (family Convolvulaceae in Uganda and compared with 34 local SPCSV isolates infecting sweetpotatoes. All isolates belonged to the East African (EA strain of SPCSV and contained RNase3 and p7, but p22 was not detected in six isolates. The three genes showed only limited genetic variability and the proteins were under purifying selection. SPCSV isolates lacking p22 synergized with Sweet potato feathery mottle virus (SPFMV, genus potyvirus; Potyviridae and caused severe symptoms in co-infected sweetpotato plants. One SPCSV isolate enhanced accumulation of SPFMV, but no severe symptoms developed. A new whitefly-transmitted virus (KML33b encoding an RNase3 homolog (<56% identity to SPCSV RNase3 able to suppresses sense-mediated RNA silencing was detected in I. sinensis. CONCLUSIONS/SIGNIFICANCE: SPCSV isolates infecting wild species and sweetpotato in Uganda were genetically undifferentiated, suggesting inter-species transmission of SPCSV. Most isolates in Uganda contained p22, unlike SPCSV isolates characterized from other countries and continents. Enhanced accumulation of SPFMV and increased disease severity were found to be uncoupled phenotypic outcomes of RNase3-mediated viral synergism in

  13. Study on the control of enzymatic browning in fresh-cut sweet potatoes%鲜切甘薯酶促褐变调控的研究

    Institute of Scientific and Technical Information of China (English)

    程双; 胡文忠; 马跃; 刘程惠

    2011-01-01

    Fresh-cut sweet potatoes were treated with different concentrations of D-sodium erythorbate and citric acid,study on the reaction of enzymatic browning at 10℃, it revealed the regulation mechanism of different browning inhibitor on fresh-cut sweet potatoes.The results indicated that 0.5%-1.5% of D-sodium erythorbate and 0.01%~0.03% citric acid delayed the occurrence of enzymatic browning, the activities of PPO and POD were inhibited effectively,the content of total phenolic was reduced.But the enzymatic browning was accelerated with the treatment of high-concentration citric acid( ≥0.05% ).Compared with the two browning inhibitor,the inhibition of D-sodium erythorbate was more effectively,the optimum concentration was 1.0%.%采用不同浓度的D-异抗坏血酸钠和柠檬酸分别处理鲜切甘薯,研究其在10℃贮藏过程中的酶促褐变反应,揭示不同褐变抑制剂对鲜切甘薯酶促褐变的调控机制.结果表明,0.5%~1.5%D-异抗坏血酸钠和低浓度(0.01%~0.03%)柠檬酸均延缓了鲜切甘薯酶促褐变的发生,有效抑制了PPO和POD的活性,降低了总酚含量;但高浓度(≥0.05%)柠檬酸处理反而加速了酶促褐变反应的进行.比较两种褐变抑制剂,D-异抗坏血酸钠抑制效果更好,其最佳浓度为1.0%.

  14. 红薯秧茎破碎还田机的研制%Design of Sweet Potato Seedling Counters-field Set

    Institute of Scientific and Technical Information of China (English)

    杜宏伟

    2015-01-01

    针对红薯秧茎的蔓生性及北方红薯种植模式,研制了适合于垄作红薯秧茎破碎还田机。该机主要由挑秧机构、秧茎破碎装置、刀轴总成、碎秧输送装置和地轮总成等组成。该机由轮式拖拉机牵引,可一次完成秧茎的收割、粉碎、还田等项作业。工作时,动力通过万向节从拖拉机的动力输出轴传出,经过锥齿轮减速器变向增速后,动力分成两路,分别传给秧茎破碎装置、碎秧输送装置和嫩秧切断装置。随着拖拉机前进,秧茎先被挑秧机构挑起,然后被机器前部高悬的旋转圆盘刀切断,高速旋转的破碎刀轴产生负压将切断的秧茎及剩余主干上的薯叶吸进破碎刀轴和护罩间破碎,碎秧落入碎秧输送装置的输送带,被均匀输送抛撒至垄沟。%Based on sweet potato cropping patterns in northern China , we develop a sweet potato seedling counters-field set .The set consists of pick-up mechanism , cut-off device , crushing device , ground wheel assembly and main frame etc.Attached directly to the tractor′s three-point linkage , it can undertake seedling stem of continuous harvesting , crush-ing, and soil etc.When running, the gear box which is made for turning and increasing speed is driven by PTO ,and then drives cutting system and crushing device individually .With the tractor moving forward , the vines was harvested by the pick-up mechanism and cut off by the rotating disc of the cut-off device , and then crushed by the crushing shaft with the help of the negative pressure caused by the high speed rotation of the crushing blade shaft .The crushed seedlings fall into the conveyer and 90%sent into the corrugation .

  15. 甘薯全粉加工中无硫复合护色工艺优化%Optimization of compound color fixative without sulfur during sweet potato flour processing

    Institute of Scientific and Technical Information of China (English)

    何继文; 程力; 洪雁; 顾正彪; 李兆丰

    2013-01-01

      为了优化甘薯全粉无硫复合护色工艺,该文通过考察柠檬酸、柠檬酸亚锡二钠、植酸、亚硫酸氢钠和抗坏血酸5种护色剂对甘薯全粉色泽的影响,优选出柠檬酸和抗坏血酸作为甘薯全粉加工合适的护色剂;通过正交试验,得到柠檬酸-抗坏血酸无硫复合护色剂的最佳护色工艺为:将10 mm厚的甘薯切片在质量分数为0.3%的柠檬酸和0.1%抗坏血酸的复合护色液中护色处理30 min,可使制得的甘薯全粉亮度值L*达90.58,多酚氧化酶的抑制率达88.13%。研究发现柠檬酸的添加能显著提高抗坏血酸的热稳定性;酶促褐变产物紫外-可见光谱扫描显示,加入复合护色剂后410 nm处吸收峰明显减弱,表明复合护色剂能有效抑制酶促褐变反应的发生;圆二色谱研究表明多酚氧化酶经复合护色剂处理后,酶蛋白二级结构中α-螺旋减少,而β-折叠结构增多,酶蛋白的分子构象被改变,从而降低多酚氧化酶活力。该文为甘薯全粉加工中的无硫复合护色工艺提供了参考。%Sweet potatoes are highly nutritious vegetables that are rich in calories and biologically active phytochemicals such asβ-carotene, polyphenols, ascorbic acid and dietary fiber. While the sweet potato is the seventh most important food crop grown in around 111 countries, China contributes about 80% of the world’s production of sweet potatoes, where the roots are used as food, animal feed and as a raw material for starch and noodle manufacture. Sweet potatoes are highly perishable and difficult to store. In developing countries, there are many problems related to storage and transportation of the raw sweet potatoes. Sweet potato flour is regarded as the ideal product to solve the storage and transportation problem which could expand its utilization in various areas of food production as well. But using sweet potato flour for product development is hindered by the

  16. Bioethanol production from sweet potato (Ipomoea batatas L. flour using co-culture of Trichoderma sp. and Saccharomyces cerevisiae in solid-state fermentation

    Directory of Open Access Journals (Sweden)

    Manas Ranjan Swain

    2013-04-01

    Full Text Available The aim of this work was to study the optimiation of co-culturing of Trichoderma sp. and Saccharomyces cerevisiae (1:4 ratio on sweet potato (Ipomoea batatas L. flour (SPF for the production of bio-ethanol in solid-state fermentation (SSF. Maximum ethanol (172 g/kg substrate was produced in a medium containing 80% moisture, ammonium sulphate 0.2%, pH 5.0, inoculuted with 10% inoculum size and fermented at 30ºC for 72h. .Concomitant with highest ethanol concentration, maximum ethanol productivity (2.8 g/kg substrate/h, microbial biomass (23×10(8 CFU/ g substrate, ethanol yield (47 g/100g sugar consumed and fermentation efficiency (72% were also obtained under these conditions. Cell interaction was observed familiar between the viable cells of Trichoderma sp. and S. cerevisiae when co-cultured. Ethanol production ability by the co-culture was 65 % higher than the single culture of S. cerevisiae from un-saccharified SPF.

  17. Efficacy of Sweet Potato Powder and Added Water as Fat Replacer on the Quality Attributes of Low-fat Pork Patties

    Directory of Open Access Journals (Sweden)

    Akhilesh K. Verma

    2015-02-01

    Full Text Available The present study was conducted to investigate the efficacy of sweet potato powder (SPP and water as a fat replacer in low-fat pork patties. Low-fat pork patties were developed by replacing the added fat with combinations of SPP and chilled water. Three different levels of SPP/chilled water viz. 0.5/9.5% (T-1, 1.0/9.0% (T-2, and 1.5/8.5% (T-3 were compared with a control containing 10% animal fat. The quality of low-fat pork patties was evaluated for physico-chemical (pH, emulsion stability, cooking yield, aw, proximate, instrumental colour and textural profile, and sensory attributes. The cooking yield and emulsion stability improved (p<0.05 in all treatments over the control and were highest in T-2. Instrumental texture profile attributes and hardness decreased, whereas cohesiveness increased compared with control, irrespective of SPP level. Dimensional parameters (% gain in height and % decrease in diameter were better maintained during cooking in the low-fat product than control. The sensory quality attributes juiciness, texture and overall acceptability of T-2 and T-3 were (p<0.05 higher than control. Results concluded that low-fat pork patties with acceptable sensory attributes, improved cooking yield and textural attributes can be successfully developed with the incorporation of a combination of 1.0% SPP and 9.0% chilled water.

  18. Identification of the starting point for spermatogenesis resumption in the post-diapause development of the sweet potato hornworm, Agrius convolvuli L.

    Science.gov (United States)

    Kubo-Irie, M; Yamaguchi, T; Tanaka, Y; Yamazaki, I; Irie, M; Mohri, H; Shimoda, M

    2011-06-01

    The resumption of spermatogenesis in post-diapause development was examined in the sweet potato hornworm (Agrius convolvuli) with in vivo bromodeoxyuridine (BrdU) incorporation experiments used to determine the starting point. Diapausing pupae were "overwintered" by chilling at 10 °C for over 4 months, after which they initiated post-diapause development by transferring the pupae to 25 °C with a 12-h light/12-h dark photoperiod. The testes of living, post-diapause pupae were injected with BrdU, which is incorporated into newly synthesized DNA strands. During the first 2 days after diapause termination, the nuclei of spermatogonia and spermatocytes failed to label with BrdU. However, on day 3 of post-diapause pupae (PDP3), labeling studies showed that cell proliferation was initiated by spermatogonia, but not by spermatocytes. In both hemolymph and testes, ecdysteroid concentrations rose gradually, reaching 0.3 μg/ml hemolymph at PDP3. These results led to the following three conclusions. The spermatogonial cell division is highly suppressed during diapause. After a long-term diapause, spermatogenesis resumes in the spermatogonia but not in the spermatocytes of diapause-terminated pupae. Cell division begins in advance of peak ecdysteroid concentrations. The latter result indicates that in post-diapause development, high concentrations of the hormone are not required to initiate spermatogonial proliferation.

  19. Chemical composition, nitrogen degradability and in vitro ruminal biological activity of tannins in vines harvested from four tropical sweet potato (Ipomoea batatas L.) varieties.

    Science.gov (United States)

    Ali, R; Mlambo, V; Mangwe, M C; Dlamini, B J

    2016-02-01

    This study investigated the potential of vines from four sweet potato varieties (Tia Nong 57, Tia Nong 66, Ligwalagwala and Kenya) as alternative feed resources for ruminant livestock. The chemical composition [neutral detergent fibre (NDF), acid detergent fibre (ADF), crude protein (CP) and acid detergent insoluble nitrogen (ADIN)], in vitro ruminal nitrogen (N) degradability and in vitro ruminal biological activity of tannins in the vines, harvested at 70 and 110 days after planting (DAP), were determined. Variety and harvesting stage did not (p > 0.05) influence CP and NDF content of the vines. Concentration of CP ranged from 104.9 to 212.2 g/kg DM, while NDF ranged from 439.4 to 529.2 g/kg DM across harvesting stages and varieties. Nitrogen degradability (ND) at 70 and 110 DAP was highest (p tannin-binding polyethylene glycol (PEG) increased (p tannins, as measured by increment in gas production parameters upon PEG inclusion, had a maximum value of 18.2%, suggesting low to moderate antinutritional tannin activity. Ligwalagwala vines, with highly degradable N, would be the best protein supplement to use during the dry season when ruminant animals consume low N basal diets and maintenance is an acceptable production objective. Tia Nong 66 and Kenya varieties, with less degradable N, may be more suitable for use as supplements for high-producing animals such as dairy goats.

  20. Evaluation of Sweet Potato Clones for Resistance to Cylas puncticollis Boheman (Coleoptera : Apionidae in Sierra Leone. A.M. Alghali & W.W. Munde

    Directory of Open Access Journals (Sweden)

    Alghali, AM.

    2001-01-01

    Full Text Available A study to evaluate fifteen clones of sweet potato for their resistance to the weevil Cylas puncticollis was under taken over two cropping seasons. The clones were mostly advanced breeding Unes or materials released to farmers in Sierra Leone. Numbers of weevils recovered from the different clones and damage levels were significantly different. However, there was a lack of correlation between damage levels and insect counts, despite significant differences for these two sets of criteria among the clones. This suggests that suitability for infestation by the weevil may be different from susceptibility to damage. Clones that suffered least damages had white fleshed tubers and skins which were elongated and dispersed in formation. Other characters for the least damaged clones include deep tuber placement and higher dry matter contents. The clones were however categorised into four groups with varying levels of susceptibility/resistance. The tuber characters are identified as conferring resistance to weevil attack and the most resistant clones are recommended for utilization in breeding programmes as indices or parents or directly as planting materials in farmers fields.

  1. Intake, growth and carcass yield of indigenous goats fed market wastes of sweet potato (Ipomoea batatas) vines and scarlet eggplant (Solanum aethiopicum).

    Science.gov (United States)

    Katongole, C B; Bareeba, F B; Sabiiti, E N; Ledin, I

    2009-12-01

    Intake, growth and carcass yield of indigenous goats fed basal diets of market wastes of sweet potato (Ipomoea batatas) vines (SPV) and scarlet eggplant (Solanum aethiopicum) (SEP) were examined in two experiments. In experiment I, the effect of presentation method (chopping, hanging or adding molasses) on the intake of SEP and SPV was evaluated. Presentation method did not influence the intake of SPV while hanging resulted in the highest (P goats were supplemented with a concentrate (25% cottonseed cake +75% maize bran) in four dietary groups: SEPD, SPVD, SEP+SPV and Control where elephant grass (Pennisetum purpureum) was offered as the roughage. SEP were offered by hanging, while SPV were chopped. The goats were slaughtered after 12 weeks of feeding. Goats in the SEPD group constantly lost weight, hence were not followed to the end. Average daily gain and hot carcass weight were highest (P goat meat production where standard feed resources are scarce when fed with an energy-protein concentrate. SEP are poorly consumed by goats, hence cannot be used as their sole basal feed.

  2. Characterization of the cellulose-binding ability of Geotrichum sp. M111 cells and its application to dehydration of the distilled waste of sweet potato shouchu.

    Science.gov (United States)

    Yoshii, H; Furuta, T; Ikeda, M; Ito, T; Iefuji, H; Linko, P

    2001-10-01

    The cellulose-binding ability of Geotrichum sp. M111 cells was investigated by the micro-tube method which gives an indication of the binding ability of M111 cells. The optimum pH value and temperature were 3-7 and below 50 degrees C, respectively, from measurement of the aggregation height for a mixture of cellulose powder and M111 cells. The binding constant of 0.3% for M111 cells to cellulose powder was obtained in a 20 mm citrate buffer of pH 5.0 at 30 degrees C. Aggregation was inhibited by such surfactants as sodium dodecylsulfate. The binding ability of M111 cells to cellulose fiber disappeared after a treatment with Driselase or Pronase E. This suggests that the binding ability might be related to the cell surface proteins. The dehydration rate of the distilled waste of sweet potato shouchu was accelerated by the addition of M111 cells. The analysis of dehydration by a linear viscoelastic model suggests that the acceleration effect might have been due to the space increase between cellulose fibers with the cell addition.

  3. Characteristics of Red Sweet Potato (Ipomea batatas Analog Rice (SPAR From The addition of Cassava Flour (Manihot utillisima and Carrot (Daucus carota

    Directory of Open Access Journals (Sweden)

    Tuty Anggraini

    2016-10-01

    Full Text Available The objective of this research was to determine the effect of the addition ratio of cassava flour and carrots in making  sweet potato analog rice. This research also used completely randomized design with 5 treatments and 3 replication. The treatment in this study was the addition of cassava flour 90%, 80%, 70%, 60%, 50%, and the carrots 10%, 20%, 30%, 40%, 50% to the entire material. The results showed that the addition of cassava flour and carrots give significantly different results on fat content, antioxidant activity and beta-carotene, no significant difference in moisture content, ash content, protein content, crude fiber content, carbohydrates, total polyphenol. The results of treatment E (50% cassava flour : 50% carrot obtained an average water content of 7.75%, 2.67% ash content, protein content of 2.56%, 0.41% fat, carbohydrate content of 86.59%, crude fibre content 18.74 %, 48.97% antioxidant activity, total polyphenols 0.61%, the determination of the energy value 3.58kcal, beta-carotene 5017.83μg / 100ml.

  4. The effect of extrusion and drying on roller techniques concerning the rheological characteristics of rice-, corn-, sweet potato-, bean- and cassava root- and leaf- based composite flour

    Directory of Open Access Journals (Sweden)

    Johanna Aristizábal Galvis

    2013-04-01

    Full Text Available Promoting food security in Latin-America and the Caribbean is directly related to agricultural products. The region faces a food crisis which has reduced large population groups’ access to food. This work contributes to the study of obtaining precooked composite flour made from biofortified crops using protein, vitamin A and/or minerals. This study evaluated the effect of precooked flour’s composition and precooking on its solubility in water, water absorption capacity, consistency and viscosity; such flour was obtained by extrusion and drying on rollers. The composite flours were obtained from cassava roots, sweet potato tubers, corn, rice and bean grains and cassava leaves. Four composite flours were formulated taking four- to six-year-old children’s daily nutrient requirements (protein, iron, zinc and beta-carotenes as a basis. The extruder was operated at 90ºC, 300 rpm screw rotation speed, 17.64 g/min feed flow, with 30% moisture mixture. The dryer rollers were operated at 4 rpm roller rotation speed, 90ºC surface temperature and 1 mm separation between rollers. It was determined that flour dried on rollers led to more complete cooking and modified starch granule structure than precooking by extrusion, thereby producing flour having greater solubility in water, less water absorption, higher consistency and smaller viscosity, comparable to that of pattern flour.

  5. Optimization of formula of sponge cake with xylitol and purple sweet potato%木糖醇紫薯海绵蛋糕的配方优化

    Institute of Scientific and Technical Information of China (English)

    单联刚; 李红涛; 马林

    2016-01-01

    研究了全蛋液、紫薯粉、木糖醇、护色剂、泡打粉、大豆油、蛋糕油添加量对木糖醇紫薯海绵蛋糕产品质量综合评分的影响,在单因素实验的基础上,通过Box-Behnken法设计实验,采用响应面分析法对产品配方进行优化.结果表明:产品最佳配方(烘焙百分比)为糕点粉100%、全蛋液157%、紫薯粉25%、木糖醇58%、白砂糖42%、护色剂0.8%(柠檬酸和抗坏血酸各0.4%),无需添加泡打粉、植物油、蛋糕油,此条件下验证实验产品综合评分为92±0.5,与理论最优值92.39基本一致.

  6. 新型天然色素——紫甘薯色素%New Kind of Natural Pigment-Purple Sweet Potato Pigment

    Institute of Scientific and Technical Information of China (English)

    肖素荣; 李京东

    2009-01-01

    紫甘薯色素作为一种新型天然色素,具有色泽鲜亮,无毒,无异味以及兼具多种营养、药理和保健功能等特点,适合现代人对健康、安全理念的要求.本文主要论述了紫甘薯色素结构特点,生物学特性及应用前景.

  7. Effect of Paclobutrazol at Different Spraying Time on Growth and Yield of Sweet Potato%多效唑的不同喷施时间对甘薯生长发育和产量的影响研究

    Institute of Scientific and Technical Information of China (English)

    张菡; 王良平; 魏鑫; 廖采琴

    2013-01-01

    To study the effect of paclobutrazol on growth,development and yield of sweet potato variety Xushu No.22 at different spraying time,four treatments with different spraying time were applied.The results showed that the spraying of paclobutrazol could effectively improve the number of branches,inhibit the growth and length of main vine,reduce the growth of aboveground parts,control the weight of vine leaves per plant,improve the weight of flesh roots per plant,and improve the economic yield of sweet potato.Our results revealed that spraying of paclobutrazol was also effective in increasing the dry matter content of sweet potato.The earlier paclobutrazol was sprayed,the better effect could be obtained.%以徐薯22为试验材料,按照喷施时间设置4个处理,研究多效唑的不同喷施时间对甘薯生长发育和产量的影响研究.结果表明:喷施多效唑能有效提高甘薯的基部分枝数,抑制甘薯主蔓生长,降低主蔓长度,同时抑制甘薯地上部茎叶生长,控制单株藤叶重量,提高单株鲜薯重,从而提高甘薯的经济产量,并能有效提高甘薯烘干率,且均表现为封垄后喷施的时间越早,效果越明显.

  8. Yield-enhancing and tuber-downsizing effects of transplantation cultivation method of case-held tuber seedlings in the sweet potato cultivar Beniharuka

    Directory of Open Access Journals (Sweden)

    Katsuki Adachi

    2016-01-01

    Full Text Available We developed transplantation cultivation method of case-held tuber seedlings (CTS, which was derived from direct planting method of seed tubers, and applied this method to the sweet potato cultivar Beniharuka. A plastic case made of polypropylene was designed for cultivation of CTS. Seed tubers of cultivar Beniharuka in the range of 30–80 g were cut in half. The half-cut tubers were placed inside the plastic cases, and the cases were filled with a commercial soil mix. The case-held tubers were incubated under natural sunlight in a glass house. After 3–4 wk, the CTS were transplanted into a field. Mother tuber (seed tuber enlargement was suppressed by the plastic confinement of the cases, and daughter tubers were formed above the case as vine-root-originated tubers. In the field experiments in 2012 and 2013, daughter tuber yields were increased 19% and 21% by case-held tuber seedling transplanting (CTST over conventional vine-planting (VP, the number of daughter tubers per plant in CTST were 36 and 68% higher than in VP, and the mother tuber yields were limited to 2.1 and 4.3% of the total fresh yield of mother and daughter tubers, respectively in 2012 and 2013. Application of CTST method to cultivar Beniharuka enhanced tuber yield, increased the number of daughter tubers per plant, downsized daughter tubers compared to VP, and mother tuber enlargement was suppressed by case-holding. The CTST method is expected to produce more and smaller good in shape tubers of cultivar Beniharuka compared to VP.

  9. Shared Binding Sites for the Bacillus thuringiensis Proteins Cry3Bb, Cry3Ca, and Cry7Aa in the African Sweet Potato Pest Cylas puncticollis (Brentidae)

    Science.gov (United States)

    Hernández-Martínez, Patricia; Vera-Velasco, Natalia Mara; Martínez-Solís, María; Ghislain, Marc; Ferré, Juan

    2014-01-01

    Bacillus thuringiensis Cry3Bb, Cry3Ca, and Cry7Aa have been reported to be toxic against larvae of the genus Cylas, which are important pests of sweet potato worldwide and particularly in sub-Saharan Africa. However, relatively little is known about the processing and binding interactions of these coleopteran-specific Cry proteins. The aim of the present study was to determine whether Cry3Bb, Cry3Ca, and Cry7Aa proteins have shared binding sites in Cylas puncticollis to orient the pest resistance strategy by genetic transformation. Interestingly, processing of the 129-kDa Cry7Aa protoxin using commercial trypsin or chymotrypsin rendered two fragments of about 70 kDa and 65 kDa. N-terminal sequencing of the trypsin-activated Cry7Aa fragments revealed that processing occurs at Glu47 for the 70-kDa form or Ile88 for the 65-kDa form. Homologous binding assays showed specific binding of the two Cry3 proteins and the 65-kDa Cry7Aa fragment to brush border membrane vesicles (BBMV) from C. puncticollis larvae. The 70-kDa fragment did not bind to BBMV. Heterologous-competition assays showed that Cry3Bb, Cry3Ca, and Cry7Aa (65-kDa fragment) competed for the same binding sites. Hence, our results suggest that pest resistance mediated by the alteration of a shared Cry receptor binding site might render all three Cry toxins ineffective. PMID:25261517

  10. Process Optimization for Synthesis of Octenyl Succinic Anhydride Modified Oxidized Sweet Potato Starch by Response Surface Analysis%响应面法优化氧化辛烯基琥珀酸甘薯淀粉酯的制备工艺

    Institute of Scientific and Technical Information of China (English)

    刘强; 邬应龙; 何靖柳

    2011-01-01

    以氧化甘薯淀粉(oxidation sweet potato starch,OSPS)为原料,制备氧化辛烯基琥珀酸甘薯淀粉酯(octenylsuccinate anhydride-oxidation sweet potato starch,OSA-OSPS)。运用响应面分析(response surface method analysis,RSA)辛烯基琥珀酸酐(octenyl succinate anhydride,OSA)添加量、pH值、温度和时间对OSA-OSPS取代度(degreeof substitution,DS)的影响,得出最佳制备工艺:酸酐添加量7%、pH8.40、温度40℃,反应时间10h。采用快速黏度分析仪(rapid viscosity analyzer,RVA)分析表明:氧化甘薯淀粉峰值黏度较低,而经过OSA酯化后,峰值黏度又会有一定程度的提高,且随DS的增加呈上升趋势。%Oxidized sweet potato starch was used as the raw material to prepare octenyl succinic anhydride(OSA) modified oxidized sweet potato starch.The effects of OSA amount,pH,temperature and reaction time on degree of substitution(DS) of OSA-modified oxidized sweet potato starch were studied employing response surface analysis.The optimum process conditions determined were as follows: OSA amount 7%,pH 8.40,temperature 40 ℃,and reaction time 10 h.Rapid viscosity analyzer(RVA) analysis showed that the peak viscosity of sweet potato starch decreased after oxidation,and increased after furthermodification with OSA with a positive correlation with DS.

  11. 外源氯胁迫对甘薯幼苗光合特性的影响%Seedlings' Photosynthetic Characteristics of Sweet Potato under Exogenous Chlorine Stress

    Institute of Scientific and Technical Information of China (English)

    戚冰洁; 曹月阳; 张珮琪; 汪吉东; 张永春; 徐阳春

    2013-01-01

    采用温室水培方法,以甘薯品种‘徐薯22’,‘苏薯11,和‘宁紫1号,为材料,外源氯(0、42.2、84.4、168.8、211 mmol· L-1)胁迫处理7d、14 d和21d,测定其生理生化及气体交换参数,探讨Cl-对甘薯幼苗生长以及光合特性的影响.结果表明:(1)‘徐薯22’叶面积与主蔓生长速率受外源氯胁迫而降低但仍维持在一定水平,而‘苏薯11’和‘宁紫1号’则在低浓度C1(≤84.4 mmol·L-1)处理下高于对照.(2)3个甘薯品种叶片净光合速率(Pn)及光合色素含量在42.2 mmol·L-1 Cl-处理下均高于对照;导致‘徐薯22’光合能力降低的主要因素为非气孔限制,而‘苏薯11'和‘宁紫1号’兼有气孔限制和非气孔限制因素,在短期或低浓度Cl-处理条件下以气孔限制因素为主.(3)处理21 d时,甘薯幼苗根系氯离子含量低于14 d且氯离子向地上部运输比率(SCl)上升;‘徐薯22,积累C1含量低于‘苏薯11’和‘宁紫1号’.研究发现:外源氯低浓度短期处理利于甘薯幼苗生长及光合作用的进行;在胁迫初期甘薯可有效抑制Cl-向地上部转运,但在处理第3周该抗逆性明显减弱;甘薯对氯胁迫的耐受性存在基因型差异,本实验中以‘徐薯22’耐性较强.%To discuss the influence of C1-for the growth and photosynthetic characteristics of sweet potato seedlings,the author used greenhouse hydroponics method to determine the physiology and biochemistry,and gas exchange data,which was taken by using exogenous chlorine stress (0,42.2,84.4,168.8,211 mmol · L-1)to test on three samples (‘ Xushu 22 ',‘ Sushu 11',‘ Ningzi 1 ') for 7,14 and 21 days.The results showed that:(1) The growth rate of leaf area and vine length for sample ‘Xushu 22' was depressed by using exogenous chlorine,but was able to maintain a certain level.On the contrary,the growth rate of leaf area and vine length for sample ‘Sushu 11' and ‘Ningzi 1' were able to maintain an increase in

  12. 红薯渣中不溶性膳食纤维提取工艺的优化%Research on extraction and property of the water insoluble dietary fiber from sweet potato

    Institute of Scientific and Technical Information of China (English)

    李泽珍; 狄建兵; 李治

    2016-01-01

    [目的]优化红薯渣中不溶性膳食纤维的提取工艺,以提高红薯渣的综合利用。[方法]以红薯渣为原料,利用碱化学法制备不溶性膳食纤维,研究料液比、碱浓度、提取时间和提取温度对不溶性膳食纤维提取率的影响,由正交实验确定红薯渣中不溶性膳食纤维的最佳提取工艺。[结果]在料液比为1∶6,碱浓度为10.0 g·L-1,提取温度为75℃,提取时间为45 min 的条件下,红薯渣中不溶性膳食纤维的提取率为70.25%,持水力为4.16 g·g-1,溶胀性为20.6 mL·g-1。[结论]碱化学法可有效提取红薯渣中的不溶性膳食纤维。%Objective]In order to propel comprehensive utilization of sweet potato residue,the extraction process of the water insoluble dietary fiber from sweet potato residue was studied.[Methods]The alkali solution was used to extract the water insoluble dietary fiber from sweet potato residue.With the solid-liquid ratio,alkali concentration,extraction time and extraction temperature for single-factor experiments,the best extraction condition of the water insoluble dieta-ry fibre was determined by orthogonal experiment.[Results]The results showed the best extraction condition of the water insoluble dietary fibre was the ratio of material to water 1∶6,alkali concentration 10.0 g·L-1 ,the extraction tem-perature 75 ℃,the extraction time 45 min.The extraction ratio of the water insoluble dietary fiber was 70.25%.The water holding was 4.1 6 g·g-1 ,and the expansibility was 20.6 mL·g-1 .[Conculusion]Alkali extraction of the water insoluble dietary fiber from sweet potato residue was effective.

  13. NaCl胁迫对不同甘薯品种体内离子分配的影响%Effect of NaCl Stress on Ion Distribution in Plants of Different Sweet Potato Varieties

    Institute of Scientific and Technical Information of China (English)

    马箐; 于立峰; 孙宏丽; 唐琪; 王宝山; 杜希华

    2012-01-01

    Six sweet potato varieties (J21, JX23, J04150, X26, X27 and X28) were used as the test materials and treated by sodium chloride with the concentration of 0, 0. 2% , 0. 3% and 0. 5% for 100 days. The growth of sweet potatoes was observed and the concentration of Na+ and K * were measured in the roots, stems and leaves. The results showed that under salt stress, the growth of all the tested sweet potatoes, especially X26, was inhibited. The concentration of Na* and the ratio of Na+/K+ in the roots, stems and leaves increased; Na + content was the highest in the roots and the lowest in the leaves. In conclusion, storing most of Na + in roots to reduce its damage to leaves may be an important way for sweet potatoes to endure higher salini-ty.%以济薯21、济徐23、济薯04150、徐薯26、徐薯27和徐薯28共6个甘薯品种为试材,用1/5 Hoagland营养液附加不同浓度NaCl(0、0.2%、0.3%和0.5%)处理甘薯苗,观察其生长情况;100 d后取样分别测定根、茎、叶中的Na+含量和K+含量.结果表明,随着NaCl浓度升高,不同甘薯品种的生长均受到抑制,其中徐薯26受抑制程度最大;根、茎、叶中的Na+含量及Na+/K+比值都有所增加,根中Na+含量最高,而叶中Na+含量最低.可见盐胁迫条件下甘薯将较多的Na+储存在根中从而减少对地上部叶片的伤害,这可能是其忍耐高盐环境的重要机制之一.

  14. Extraction of Sweet Potato Peel Pigment and Stability on Different Conditions%红薯皮色素的提取及其对条件的稳定性

    Institute of Scientific and Technical Information of China (English)

    王惠琴; 林太凤; 张丽华; 张淑芬; 郑大威

    2015-01-01

    Functional and natural pigment was prepared using the conventional extraction method from waste sweet potato peals which produced in the sweet potato processing under acidic conditions , in which the added value of sweet potato was increased and environmental pollution could be reduced. The stability of the sweet potato skin pigment was studied through the effects of temperature , pH value and the influence of added metal ions, oxidant, reducing agent, salt, starch, glucose, malic acid and other factors. The result showed that the pigment was stable at room temperature~100℃and 2.0~4.0 pH value, different kinds of oxidant can affect the stability, moreover, salt Mg2+, Al3+, Na+, Ca2+, Fe3+and starch can increase the pigment's color in a way.%以红薯加工过程中产生的废弃物红薯皮为原料,提取分离红薯皮红色素,不但能够增加红薯深加工产品的附加值,而且能够解决红薯皮作为废弃物造成的环境污染问题,并且可以为食品行业提供一种新的具有保健功能和一定营养价值的天然色素。采用常规的提取方法,在酸性条件下提取制得红薯皮红色素。对制得的红薯皮红色素进行了稳定性研究,考察了温度、pH以及加入相关的金属离子、氧化剂、还原剂、盐、葡萄糖、淀粉、苹果酸等因素的影响,结果表明,制得的色素溶液,在(18~100)℃和pH为2.0~4.0时稳定性良好;氧化剂种类不同,影响效果也不同;盐和Mg2+, Al3+, Na+, Ca2+, Fe3+五种金属离子以及淀粉可使色素色度增加,有一定的增色作用。

  15. Boron fertilization on sweet potato: effect of sources, rates and application formAdubação com boro em batata-doce: efeito das fontes, doses e modos de aplicação

    Directory of Open Access Journals (Sweden)

    José Eduardo Creste

    2011-12-01

    Full Text Available Boron (B fertilization can result in high yield and better sweet potato storage roots quality. However, there is few works about this subject. The objective was to evaluate the yield of sweet potato crops in response to B sources, rates and application form. The experimental design was complete randomized blocks, in factorial outline ((2x2x2+1, with three replications, which resulted of the combination of sources of B (boric acid and borax, application form (via soil and via foliar and doses of B (1 and 2 kg ha-1 and a control treatment (without B. There was no interaction between the factors studied for the commercial yield of sweet potato. No significant differences was found between B sources and application form, but they showed higher yield than the control treatment. Additionally, sweet potato yield increade with application of 2 kg ha-1 of B.A adubação boratada pode proporcionar aumentos na produtividade e na qualidade das raízes tuberosas de batata-doce, no entanto poucos trabalhos contemplam esse assunto. Objetivou-se avaliar a produtividade da cultura da batata-doce em resposta a fontes, doses e modos de aplicação de B. O delineamento experimental utilizado foi o de blocos casualizados, em esquema fatorial ((2x2x2+1, com três repetições. Os tratamentos foram aplicados em cobertura, sendo resultados da combinação de fontes de B (ácido bórico e bórax, formas de aplicação (via solo e via foliar e doses de B (1 e 2 kg ha-1 mais uma testemunha. Não houve interação entre os fatores estudados sobre a produtividade comercial de batata-doce. As formas de aplicação, via solo e via foliar bem como as fontes ácido bórico e bórax não apresentaram diferenças entre si, mas proporcionaram produtividades superiores ao tratamento sem B. A produtividade de batata-doce foi favorecida com a aplicação de 2 kg ha-1 de B.

  16. Mixed Infections of Four Viruses, the Incidence and Phylogenetic Relationships of Sweet Potato Chlorotic Fleck Virus (Betaflexiviridae) Isolates in Wild Species and Sweetpotatoes in Uganda and Evidence of Distinct Isolates in East Africa

    Science.gov (United States)

    Tugume, Arthur K.; Mukasa, Settumba B.; Valkonen, Jari P. T.

    2016-01-01

    Viruses infecting wild flora may have a significant negative impact on nearby crops, and vice-versa. Only limited information is available on wild species able to host economically important viruses that infect sweetpotatoes (Ipomoea batatas). In this study, Sweet potato chlorotic fleck virus (SPCFV; Carlavirus, Betaflexiviridae) and Sweet potato chlorotic stunt virus (SPCSV; Crinivirus, Closteroviridae) were surveyed in wild plants of family Convolvulaceae (genera Astripomoea, Ipomoea, Hewittia and Lepistemon) in Uganda. Plants belonging to 26 wild species, including annuals, biannuals and perennials from four agro-ecological zones, were observed for virus-like symptoms in 2004 and 2007 and sampled for virus testing. SPCFV was detected in 84 (2.9%) of 2864 plants tested from 17 species. SPCSV was detected in 66 (5.4%) of the 1224 plants from 12 species sampled in 2007. Some SPCSV-infected plants were also infected with Sweet potato feathery mottle virus (SPFMV; Potyvirus, Potyviridae; 1.3%), Sweet potato mild mottle virus (SPMMV; Ipomovirus, Potyviridae; 0.5%) or both (0.4%), but none of these three viruses were detected in SPCFV-infected plants. Co-infection of SPFMV with SPMMV was detected in 1.2% of plants sampled. Virus-like symptoms were observed in 367 wild plants (12.8%), of which 42 plants (11.4%) were negative for the viruses tested. Almost all (92.4%) the 419 sweetpotato plants sampled from fields close to the tested wild plants displayed virus-like symptoms, and 87.1% were infected with one or more of the four viruses. Phylogenetic and evolutionary analyses of the 3′-proximal genomic region of SPCFV, including the silencing suppressor (NaBP)- and coat protein (CP)-coding regions implicated strong purifying selection on the CP and NaBP, and that the SPCFV strains from East Africa are distinguishable from those from other continents. However, the strains from wild species and sweetpotato were indistinguishable, suggesting reciprocal movement of SPCFV

  17. FORMULATION AND PROCESS OPTIMIZATION OF MUFFIN PRODUCED FROM COMPOSITE FLOUR OF CORN, WHEAT AND SWEET POTATO [Formulasi dan Optimasi Proses Produksi Mufin dari Tepung Komposit Jagung, Gandum dan Ubi Jalar

    Directory of Open Access Journals (Sweden)

    Stefani Hartono1

    2012-12-01

    Full Text Available Intensification of use of local carbohydrate sources such as corn and sweet potato is expected to minimize wheat import and support food diversification program. The objective of this research was to optimize the composite flour composition and baking process conditions in muffin production. This research was divided into 3 steps namely formula optimization using mixture design techniques, process optimization using response surface methodology and final product analysis. The formula and process optimization was based on sensory parameter using hedonic rating test involving 70 untrained panelists. The results showed that the optimum formula was a formula with 4% wheat flour, 86% corn flour, and 10% sweet potato flour. The optimum baking condition was 39 minutes at 157°C. Analysis of muffin made with the optimum formula and baking conditions showed that the muffin had hardness, moisture, ash, protein, fat, cabohydrate, and crude fibre of 107.3 gf, 23.22%, 1.83%, 5.89%, 22.46%, 69.82%, and 0.26%, respectively.

  18. KARAKTERISASI TEPUNG UBI JALAR (Ipomoea batata L. VARIETAS SHIROYUTAKA SERTA KAJIAN POTENSI PENGGUNAANNYA SEBAGAI SUMBER PANGAN KARBOHIDRAT ALTERNATIF [Characterization of Sweet Potato Flour (Ipomea batatas L. var. Shiroyutaka and Assesment of the potential as Alternative Carbohydrate Source For Food Product

    Directory of Open Access Journals (Sweden)

    Beni Hidayat 1

    2007-06-01

    Full Text Available This research was aimed to characterize sweet potato flour var. shiroyutaka and assessment of its potential as alternative carbohydrate source on food product. Characterization was conducted on flour processed from sweet potato var. shiroyutaka harvested at four months was characteristic, these included whiteness degree and water absorption of the flour, ratio of amylase-amylopectin, form and size of starch granule, and starch digestibility.The research showed that whiteness degree and water absorption of the flour were 78,82% ( 0,52 and 1,25 g/g ( 0,12 respectively. The ratio of amylase-amylopectin, gelatinization temperature, maximum viscosity and invitro starch digest ability were 69.82%: 30.18%, 78-900C and 84,78% respectively. The granule of its starch was round form and with size 2-4 micron.The main potential of the flour is related with its specific characteristics which were the amylose-amylopectin ratio, the starch amylograph profile, form and size of starch granule, and the starch digest ability. These parameters implied that, the flour should be utilized in the production specific food products.

  19. The Test of the Contents of Chlorogenic Acid and Total Flavonoids in Different Organs of Sweet Potatoes%甘薯不同器官绿原酸和总黄酮含量检测

    Institute of Scientific and Technical Information of China (English)

    王彩君; 李瑞国

    2014-01-01

    The study of the contents of chlorogenic acid and total flavonoids in different organs of sweet potatoes was significant for the further development of the plant resources of them. The present research adopts the acid ethanol refluxing method to extract the chlorogenic acid, the Alkali ethanol refluxing method extracting the total flavonoids, the spectrophotography measuring its quantity. The result showed that the contents of chlorogenic acid was more than that of total flavonoids in the different organs of sweet potatoes , and the contents of chlorogenic acid and total flavonoids in stems and leaves are more than in root tubers.%研究甘薯不同器官绿原酸和总黄酮含量,对进一步开发甘薯植物资源具有重要意义。采用酸乙醇回流法提取绿原酸,碱乙醇回流法提取总黄酮,分光光度法测定其含量。结果显示甘薯不同器官中绿原酸含量高于总黄酮含量,茎和叶中绿原酸和总黄酮含量均多于块根。

  20. Induction of furano-terpene production and formation of the enzyme system from mevalonate to isopentenyl pyrophosphate in sweet potato root tissue injured by Ceratocystis fimbriata and by toxic chemicals

    Energy Technology Data Exchange (ETDEWEB)

    Oba, K.; Tatematsu, H.; Yamashita, K.; Uritani, I.

    1976-07-01

    When sweet potato (Ipomoea batatas) root tissue was infected by Ceratocystis fimbriata, activity of the enzyme system from mevalonate to isopentenyl pyrophosphate, especially of pyrophosphomevalonate decarboxylase (EC 4.1.1.33), was increased in the noninfected tissue adjacent to the infected region, preceding the furano-terpene production in the infected region. Cutting and incubation of sweet potato slices did not produce furano-terpenes, and only slightly increased the activity of the enzyme system from mevalonate to isopentenyl pyrophosphate. The enzymic activity in diseased tissue was localized in the soluble fraction, and was higher in the tissue from the surface to a depth of about 5 mm with gradual decrease toward the inner part. Mercuric chloride (0.1%, w/v) and sodium dodecyl sulfate (1.0%, w/v) were utilized as model inducers of furano-terpenes and pyrophosphomevalonate decarboxylase. The mercuric chloride- or sodium dodecyl sulfate-induced response was inhibited by administration of cycloheximide to the discs together with the inducer immediately after disc preparation. When cycloheximide or blasticidin S was applied together with the inducer, to the discs 9 hours or more after disc preparation, the induction was not inhibited but rather stimulated.

  1. Influência da adição da fécula de batata-doce (Ipomoea batatas L. sobre a viscosidade do permeado de soro de queijo Influence of sweet potato starch at permeate whey viscosity

    Directory of Open Access Journals (Sweden)

    Rafael Leite Pinto de Andrade

    2002-12-01

    Full Text Available A viscosidade é um parâmetro importante na aceitabilidade de bebidas lácteas. O presente trabalho teve como objetivo principal fornecer dados relativos ao comportamento da viscosidade uma base de permeado de soro de queijo adicionada de fécula de batata-doce, dados que poderão ser utilizados na elaboração de uma nova bebida láctea. A fécula de batata-doce utilizada apresentou um grau de gelatinização de 72,64%, umidade média de 7,88% e a seguinte composição centesimal média em base seca: 82,59% de amido, 9,33% de fibras dietéticas totais, 4,90% de proteínas, 2,08% de cinzas e 1,11% de lipídios. O permeado de soro foi adicionado a três diferentes concentrações de fécula e submetido a diferentes tratamentos térmicos. A viscosidade mais adequada, em função dos dados obtidos junto aos produtos comerciais, estaria no intervalo de 45mPa.s a 70mPa.s. Assim sendo, a porcentagem de 6% de fécula de batata-doce e um tratamento térmico de 90ºC por cerca de 5 minutos mostrou-se ser o mais adequado. O fluido obtido apresentou um comportamento pseudoplástico.Viscosity is an important parameter of milky drinks acceptability. This work supply data of the viscosity properties of permeate whey plus sweet potato starch basis; these data will may be used at development of a new milky beverage. The used sweet potato starch presented 72.64% of gelatinization, 7.88% of humidity and the following dry composition: 82.59% starch, 9.33% total dietary fibres, 4.90% proteins, 2.08% ashes and 1.10% lipids. The permeate whey had mixed at three different percentages of potato starch and had submitted at various thermal treatments. The most appropriate viscosity, in accord of commercial products, it would be in the interval of 45mPa.s to 70mPa.s. Therefore, the percentage of 6% of sweet potato starch and a thermal treatment of 90ºC for about 5 minutes it was shown to be the most appropriate. The fluid presented a pseudoplastic properties.

  2. 酶法提高红薯渣可溶性膳食纤维得率的研究%Use of the enzyme for raising the SDF content in sweet potato

    Institute of Scientific and Technical Information of China (English)

    幸宏伟; 陈劲春

    2011-01-01

    Sweet potato residue was consist of three kinds of materials,which were red picea red heart,red picea white heart and white picea red heart.Compared through the experiment,the results of contents of the soluble dietary fiber showed that red picea white heart sweet potato was the best material to extract and convert to soluble dietary fiber.The dried and smashed sweet potato residue was used as the raw materials.Sweet potato residue dietary fiber were extracting by mixing enzyme(α﹣maylase:glueomaylose,l:3).The dietary fiber was converted to soluble dietary fiber by cellulase in the materials.The precipitate was collected and the soluble dietary fiber was obtained by adding four times ethanol.The optimized conditions to degrade dietary fiber,explored through single factors and orthogonal experiment,were 125 μL of cellulase,reaction time of 2.5 h,temperature of 50 ℃,and pH of 4.0.The contents of the soluble dietary fiber in sweet potato residue could be increased from 32.19% to 60.97%,compared with the experiment that were not use the cellulase,which raised by 28.78%.%分别由红皮黄心、红皮白心、白皮红心3种红薯渣原料制备,通过实验比较可溶性膳食纤维的得率,结果表明:红皮白心红薯是提取并转化获得可溶性膳食纤维的最理想材料。以干燥、粉碎的红薯渣为原料,用α-淀粉酶和糖化酶1:3混合提取红薯渣膳食纤维,利用纤维素酶法将原料中的膳食纤维降解为可溶性膳食纤维,经4倍无水乙醇沉淀后获得可溶性膳食纤维。实验在单因素基础上,通过正交实验确定最佳纤维素酶法降解膳食纤维条件为:纤维素酶用量120μL,反应温度50℃,酶作用时间为2.5h,pH为4.0,未采用纤维素酶降解的对照组实验所得可溶性膳食纤维含量为32.19%,正交实验优化提取条件后得到的红薯渣可溶性膳食纤维含量为60.97%,提高了28.78%。

  3. 增施氮素对甘薯叶片光合作用和 CO2的响应%Response of sweet potato leaves to light intensity and CO2 concentration under increased N-fertilizer level

    Institute of Scientific and Technical Information of China (English)

    陈功楷; 李红; 孙娟; 金微微; 康华靖

    2014-01-01

    甘薯因具高产稳产、抗旱耐瘠的特点而适合在新开垦山地中推广。为明确其合理的氮肥用量,本试验选用3个甘薯品种,研究低浓度(124 mg· kg -1)和高浓度(180 mg· kg-1)2个施肥量对叶片光合生理特性的影响。结果表明,在两种浓度下不同品种甘薯叶片的比叶面积无显著差异;叶绿素b含量、叶绿素(a+b),以及叶片氮含量则均以高浓度处理下较高( P<0.05);光响应曲线参数中的初始量子效率(α)、最大光合速率(Pnmax)、饱和光强(PARsat)、光补偿点(Ic)及暗呼吸速率(Rn)等整体上均无显著差异(P>0.05);CO2响应曲线中的最大羧化速率(Amax)和CO2补偿点(Γ)无显著变化(P>0.05),高浓度处理的初始羧化效率显著高于低浓度处理(P<0.05),高浓度处理饱和胞间CO2浓度则明显降低(P<0.05)。综上所述,甘薯种植过程中建议适当减少氮肥的施用量。%Due to the relatively high and stable yield , and high tolerance to drought , sweet potato is suitable to be cultivated in the newly reclaimed mountain land .In order to determine the suitable application amount of N-fertilizer, three sweet potato cultivars and two N-fertilizer application levels were used to study the influence on photosynthetic characteristics of sweet potato leaves .The results showed that the difference of specific leaf weight was not significant between two N-fertilizer levels .The contents of chlorophyll b , chlorophyll ( a+b) and leaf nitrogen were dramatically increased under high N level.The related parameters of light response curve, such as the initial quantum efficiency (α), maximum photosynthetic rate (Pnmax ), saturation light intensity (PARsat ), light compensation point (Ic ) and dark respira-tion rate (Rn) showed no significant differences (P>0.05) in general.And, the relevant parameter curve in response to CO2, namely, the maximum

  4. Topdressing fertilization with nitrogen and potassium levels in sweet-potatoAdubação de cobertura na batata-doce com doses combinadas de nitrogênio e potássio

    Directory of Open Access Journals (Sweden)

    José Salvador Simoneti Foloni

    2013-03-01

    Full Text Available Balanced fertilizations with N and K often increase the performance of crops, however, when there is absence of one of these nutrients in poor soils, can reduce crop response to fertilization with the other. The objective of this work was to evaluate the productivity of sweet-potato, the amount of sweetpotato without quality, and leaf nutrients analysis, of sweet-potato crop fertilized with N and K. The trial was conducted in farming for commercial production, in Presidente Prudente, São Paulo State, during February-June 2007, in a dystrophic Ultisol of medium texture. The experimental design was a randomized complete block design, with four replications, on factorial 4 x 4: levels of 0, 30, 60 and 120 kg N ha-1 (urea source combined with levels of 0, 30, 60 and 120 kg K2O ha-1 (KCl source, applied to 39 days after planting of the crop. The sweet-potato is responsive to topdressing application with nitrogen and potassium, however, the greatest increases in productivity occur when doses of N and K are combined. Fertilization with N and K not increase the amount of sweet-potato without quality marketing. The highest increase in productivity of sweet-potato is reached with topdressing combined with 100 kg N ha-1 plus 120 kg K2O ha-1. A adubação balanceada de N e K frequentemente aumenta o desempenho das lavouras, contudo, a falta de um desses nutrientes em solos deficientes pode levar a decréscimos na resposta ao outro. O objetivo deste trabalho foi avaliar a produtividade de batata-doce comercializável, a quantidade de raízes tuberosas para descarte e a diagnose foliar de lavoura de batata-doce adubada com N e K. O experimento foi realizado em lavoura comercial, em Presidente Prudente-SP, de fevereiro a junho de 2007, em um Argissolo Vermelho distroférrico de textura média. O delineamento experimental foi em blocos completos casualizados, com quatro repetições, no esquema fatorial 4 x 4, com 0, 30, 60 e 120 kg ha-1 de N (uréia, em

  5. Comparative Study on the Extraction Process of Dietary Fiber from Sweet Potato%甘薯膳食纤维不同提取工艺的比较研究

    Institute of Scientific and Technical Information of China (English)

    全桂静; 耿大伟

    2012-01-01

    [Objective] To compare the extraction results of several different methods. [Method] The dietary fiber was extracted from sweet potato respectively by the sieve method,the enzymatic process and enzyme-alkali method. The extraction results of the three methods were optimized and compared. [Result] The extraction rate of dietary fiber by enzymatic method was the highest, which could reach 38% of total potato residue. The properties of dietary fiber extracted by the three methods were compared, the results indicated that the dietary fiber extracted by enzymatic method had good water-holding capacity, soil absorption and expansion. [ Conclusion] The enzymatic method is the best for extracting dietary fiber from sweet potato.%[目的]比较几种不同工艺对甘薯膳食纤维的提取效果.[方法]试验采用筛法、酶法及酶碱法提取甘薯膳食纤维,优化并比较这3种提取工艺的提取效果.[结果]酶法提取甘薯膳食纤维的提取率最高,能达到薯渣质量的38%.对所得膳食纤维的特性进行了研究比较,结果显示,酶法工艺得到的膳食纤维的持水性、吸油性及膨胀性均较好.[结论]酶法适宜于甘薯膳食纤维的提取.

  6. 蔗糖对紫色土豆微型薯形成及花青素含量的影响%Effect of sucrose on minituber formation and the accumulation of anthocyanin in purple potato

    Institute of Scientific and Technical Information of China (English)

    杨瑞娟; 龚一富; 郭伦; 杭雨晴; 王何瑜

    2015-01-01

    为深入探讨蔗糖在植物花青素生物合成过程中的调节作用,以紫色土豆为材料,分析不同蔗糖浓度对紫色土豆外植体生长、花青素含量、微型薯形成以及花青素生物合成相关基因表达的影响。结果表明,紫色土豆外植体在蔗糖浓度为15 g/L时生长情况最好,平均长度最长,平均重量最重,但高浓度蔗糖对外植体生长起抑制作用;蔗糖能促进紫色土豆花青素含量的积累及微型薯的形成,随着蔗糖浓度的增加,花青素含量随之增加,紫色土豆花青素含量在蔗糖浓度为120 g/L时最高,为5.11 mg/g FW,是对照组的8.89倍;蔗糖浓度为60 g/L时,微型薯重量最重,为0.34 g,结实率最高,达到22.50%。 RT-PCR结果显示,蔗糖能促进StF3′5′H、StUFGT以及StDFR的表达,蔗糖通过调控此类花青素合成相关基因的表达影响紫色土豆花青素含量。%To illuminate the sucrose regulation of plant anthocyanin biosynthesis pathway , the effects of different sucrose concentration on the explants growth , anthocyanin accumulation , the minituber formation and the related gene expression involved in anthocyanin bio -synthesis in purple potato were investigated .The results indicated that when cultured with 15 g/L sucrose , the explants have the best growth condition , the growth of explants was inhibited at high concentration of sucrose .Sucrose enhanced the contents of anthocyanin and the minituber formation in purple potato .With the increasing of sucrose concentration , anthocyanin accumulation was significantly increased.When treated with 120 g/L sucrose, the contents of anthocyanin achieved the highest value as 5.11 mg/g FW.The minitu-bers have a heaviest weight (0.34 g) and highest setting rate (22.50%), when treated with 60 g/L sucrose.The related genes in-volved in anthocyanin biosynthesis including StF3′5′H, StDFR and StUFGT were up-regulated by sucrose , implying

  7. 甘薯不同时期干物质积累及光合特性研究%Dry matter accumulation and photosynthetic characteristics of sweet potato at different growth stages

    Institute of Scientific and Technical Information of China (English)

    黄咏梅; 李彦青; 吴翠荣; 李慧峰; 陈天渊; 卢森权

    2012-01-01

    [Objective]The photosynthetic characteristics of sweet potato with different dry matter rate and sweet potato's yield potential at different growth stages were studied in order to provide references for improving sweet potato production. [Method]Two sweet potato varieties, Guifen 2 and Bendishu, were used to test the dry matter rate of their corresponding root tuber, leaf photosynthesis, freshness, and dry potato yield. [Result]Dry matter rate of Guifen 2 with high starch content increased during the growth period of 77-107 days, and then it decelerated a bit and kept the same a certain level after 107 days. Dry matter rate of Bendishu with low starch content gradually increased with only a little variation during the entire growth period. During the growth period of 36-77 d, the net photosynthetic rate, transpiration rate, and stomatal conductance of the two cultivars grew constantly; but after 77 d, they all decreased substantially. Intercellular CO2 concentration accelerated during the growth period of 36-60 d, then descended after 60 d. At different growth stages, four indicators viz., net photosynthetic rate, transpiration rate, stomatal conductance, and intercellular CO2 concentration in Guifen 2 with high starch content were higher than those of Bendishu. [Conclusion]High starch content type Bweet potato Guifen 2 produced less fresh potato than low starch content type sweet potato Bendishu, while dry matter rate, dry potato yield, and photosynthetic ability of Guifen 2 were higher than those of Bendishu. Photosynthetic rate change of Bendishu was caused by stomatal limitations, whereas that of Guifen 2 was caused by stomatal and non-stomatal limitations.%[目的]了解具有不同产量潜力及不同干物率的甘薯品种光合特性的差异,为其在生产中的利用提供参考依据.[方法]以不同淀粉型甘薯品种桂粉2号和本地薯为材料,研究其不同时期块根干物率、叶片光合作用及收获时鲜薯、薯干产量.[结

  8. 电解法和微波法联合处理提高甘薯淀粉回生率%Increasing Retrogradation Rate of Sweet Potato Starch by Method of Combined Electrolysis and Microwave Treatment

    Institute of Scientific and Technical Information of China (English)

    连喜军; 钱瑞; 刘敬; 赵娟; 肖学勇; 刘洋

    2011-01-01

    以甘薯淀粉为原料,采用电解、微波复合法制备回生抗性淀粉;以抗性淀粉制备率为考察指标,讨论微波、电解顺序对回生抗性淀粉制备产率的影响。最佳工艺为:淀粉→糊化→高压→微波→电解→老化→酶解→离心→干燥;最佳工艺参数:淀粉乳质量浓度50 g/L,高压温度120℃,高压时间30 min,糊化温度90℃,糊化时间30min,微波功率400 W,处理时间4 min,电解电压90 V,电解时间2 min,老化温度4℃,老化时间12 h。在此工艺条件下,甘薯回生抗性淀粉产率为24%,比空白组12%产率提高了1倍。%Taking sweet potato starch as raw material and retrogradation rate as an inspection target,the effects of sequence of microwave wave and electrolysis treatments on retrogradation rate of sweet potato were discussed in this experiment.The best process sequence was: Starch→ Pasting → Autoclaving → Microwave → Electrolysis → Aging → Hydrolysis → Centrifugal →Drying and the best technical factors were: ratio of starch and water 5%,high-pressured temperature and treating time 120 ℃,30 min,pasting temperature and treating time 90 ℃,30 min,microwave power and treating time 400 W,4 min,Electrolytic voltage and treating time 90 V,2 min,aging temperature 4 ℃,aging time 12 h.The highest retrogradation rate of sweet potato starch at the optimum conditions was 24%,which was 100% higher than that of control group 12%.

  9. 黄肉甘薯多酚类提取物的抗氧化活性研究%STUDY ON ANTIOXIDANT ACTIVITY OF POLYPHENOL EXTRACTS FROM YELLOW FLESH SWEET POTATO

    Institute of Scientific and Technical Information of China (English)

    师超; 卞科

    2011-01-01

    In this paper, we respectively extracted polyphenols from the flesh and peel of yellow flesh sweet potato by ethanol extraction method, studied the antioxidant activity of the polyphenol extracts from the flesh and peel of yellow flesh sweet potato using gallic acid as the reference control, and respectively determined the effects of the polyphenol extracts on scavenging superoxide anion radicals, hydrogen peroxide and hydroxyl radicals, the reduction capability, and the oxidation resistance to edible oils. The results showed that the content of polyphenols in the peel was 15.654 mg/g, which was about 3.17 times of that in the flesh; the antioxidant activity of the polyphenol extracts from flesh and peel of yellow flesh sweet potato was as excellent as gallic acid; and the polyphenol extracts were the natural antioxidant with development and utilization values.%采用乙醇浸提法分别提取黄肉甘薯肉和皮的多酚类物质,薯皮和肉总多酚的含量分别为15.654 mg/g和4.938 mg/g,薯皮中的含量约为薯肉的3.17倍.并以没食子酸为对照品对黄肉甘薯肉和皮多酚类提取物的抗氧化活性进行了研究.通过5种不同的抗氧化体系,分别测定了黄肉甘薯肉和皮多酚类提取物对超氧阴离子自由基、过氧化氢、羟基自由基的清除能力、还原能力以及对食用油脂的抗氧化性的影响.结果表明:黄肉甘薯肉和皮多酚类提取物具有与没食子酸一样良好的抗氧化性能,是一种具有开发利用价值的天然抗氧化剂.

  10. Influence of extraction process on the physicochemical properties of sweet potato pectin%提取工艺对甘薯果胶物化特性影响的研究

    Institute of Scientific and Technical Information of China (English)

    郭祖锋; 梁新红; 孙俊良; 唐玉; 李元召

    2012-01-01

    Pectin from sweet potato with HCI and Na2HPO4 was studied. The pectin was precipitated by alcohol and dried by freeze method. The effects of these two technologies on physicochemical properties of sweet potato pectin were compared. The results showed that: the purity of pectin with Na2HPO4 was (81.5±9.3)%, solubility (99.8±1.6)%, viscosity (22±4.6)%, and degree of esterification (58.2±3.5)%, degree of gelation (146.1±3.5)%. The physiochemical properties of the pectin with Na2HPO4 were superior. It is similar to apple pectin. The purity of pectin with Na2HPO4 was higher, and its water-soluble was better, which is suitable for food industry. The research is of theoretical and practical significance for the industrial production of sweet potato pectin.%分别以盐酸和磷酸氢二钠为提取剂从甘薯渣中提取果胶,经乙醇沉淀和冷冻干燥得到甘薯果胶。研究酸法、盐法2种工艺对甘薯果胶物化特性的影响。结果表明:盐提果胶纯度为(81.5±9.3)%,溶解度(99.8±1.6)%,黏度为(22±4.6)%,酯化度为(58.2±3.5)%,胶凝度为(146.1±3.5)%。盐提果胶物化特性优于酸提果胶,与苹果果胶相似,盐提果胶的纯度高,水溶性较好,适合食品工业应用。研究对甘薯果胶的工业化生产具有理论及实践意义。

  11. 甘薯渣果胶超声波辅助盐法提取工艺的优化%Optimization of Ultrasonics-assisted Salt Extraction Technology for Pectin from Sweet Potato Residues

    Institute of Scientific and Technical Information of China (English)

    刘倩倩

    2015-01-01

    以淀粉加工后的甘薯渣为原料,采用超声波辅助盐法提取果胶,通过单因素试验和响应面优化试验,探讨提取液质量浓度、提取时间、提取温度、pH值、超声波功率、提取液料比6个因素对果胶提取率的影响,并对提取工艺条件进行优化。结果表明,超声波辅助盐法提取甘薯渣果胶的最佳工艺条件为:提取液质量浓度3.95 mg/mL、提取温度66℃、提取时间1.7 h、pH值2.0、超声波功率375 W、提取液料比20∶1(mL∶g),在此工艺条件下,果胶提取率达15.48%。该工艺可以有效地从甘薯渣中提取果胶。%The pectin from sweet potato residues were extracted by ultrasonic-assisted salt method,and the effects of extracting solution concentration,extraction time,extraction temperature,pH value,ultrasonic powers,liquid to material ratio on extraction rate of pectin were studied by single-factor experiments and response surface methodology.The results showed that the optimum conditions of ultrasonic-assisted salt extraction technology for pectin from sweet potato residues were extracting solution concentration of 3.95 mg/mL,extraction temperature of 66 ℃,extraction time of 1.7 h,pH value of 2.0,ultrasonic powers of 375 W,liquid to material ratio of 20∶1, under the above conditions, the extraction rate of pectin was 15.48%.Overall,pectin could be extracted from sweet potato residues effectively with the above technology.

  12. Respiratory activity and browning of minimally processed sweet potatoes Atividade respiratória e escurecimento de raízes de batata-doce minimamente processada

    Directory of Open Access Journals (Sweden)

    Celso L. Moretti

    2002-09-01

    Full Text Available Sweet potatoes (Ipomoea batatas L., 'Brazlândia Roxa', 'Brazlândia Branca' and 'Princesa' were harvested at optimum maturity to evaluate respiratory activity and browning susceptibility of minimally processed roots. After harvest, non-blemished roots were graded for size (18±2cm and diameter (5±1cm, and minimally processed inside a cold room. Processed roots were placed in sealed glass jars and stored at 3±0.5°C to evaluate respiratory activity during a 4-hour period or were packed in plastic films with partial vacuum to evaluate development of browning. Packages were stored under refrigerated conditions (3±0.5°C for 5 days. Daily, minimally processed roots were evaluated for browning according to a scale ranging from 0 (extremely browned to 5 (no browning and using an objective assay (absorbance at 340 nm. Minimally processed roots showed a pronounced increase in carbon dioxide evolution immediately after processing. 'Princesa' had the highest respiratory activity among the evaluated cultivars, being 40% higher two hours after processing than the other cultivars. 'Brazlândia Roxa' and 'Brazlândia Branca' were significantly less susceptible to browning compared to 'Princesa', which was rated as unacceptable for commercial use at the end of the storage period. 'Brazlândia Roxa' and 'Brazlândia Branca' were still marketable at the end of the storage period.Batata doce (Ipomoea batatas L., 'Brazlândia Roxa', 'Brazlândia Branca' e 'Princesa' foram colhidas no ponto ótimo de maturidade hortícola, com o objetivo de avaliar-se a atividade respiratória e a suscetibilidade ao escurecimento de raízes minimamente processadas. Após a colheita, raízes sem danos mecânicos aparentes foram selecionadas para tamanho (18±2cm e diâmetro (5±1cm e foram minimamente processadas no interior de uma câmara fria. As raízes minimamente processadas foram colocadas em frascos de vidro hermeticamente fechados e armazenados a 3±0,5°C para avaliar

  13. Collection and morphological characterization of sweet potato landraces in north of Rio de Janeiro state Coleta e caracterização morfológica de variedades locais de batata-doce no norte do Rio de Janeiro

    Directory of Open Access Journals (Sweden)

    Monique M Moulin

    2012-06-01

    Full Text Available The traditional farmers play an important role in plant genetic resources conservation. Collecting the germplasm maintained by these farmers is a very important action to avoid genetic variability losses. The goals of this work were to collect sweet potato from farms in the north of Rio de Janeiro state; to gather information regarding to the farmers profile, and to characterize the sweet potato landraces collected using morphological descriptors. Fifty three farms were visited in six collection expedition and 46 accessions were collected. During the visits the farmers were interviewed using a query with ten items. Six root traits and eight descriptors for vegetative parts were used for morphological characterization. The data were analyzed based on Cole-Rodgers distance and clustering was done with UPGMA method. Familiar agriculture with subsistence objective was observed and sweet potato was cultivated by 72% of the farmers at least for more than a decade, supporting the observation that this vegetable is traditionally cultivated in small areas in the specific region. The morphological characterization was efficient to detect genetic variability among accessions, revealing that traditional farmers from Campos dos Goytacazes and São João da Barra are responsible for sweet potato genotypes conservation with expressive genetic diversity in their properties. There was no relationship between genetic distance and collecting areas.Os agricultores tradicionais têm um papel fundamental na conservação dos recursos genéticos vegetais e a coleta de germoplasma mantido por esses produtores é muito importante para evitar a perda da variabilidade genética. Os objetivos deste trabalho foram coletar germoplasma de batata-doce em propriedades rurais situadas no norte do estado do Rio de Janeiro; levantar informações quanto ao perfil dos produtores rurais visitados durante as coletas, e caracterizar morfologicamente as variedades locais de batata

  14. Características produtivas e qualitativas de ramas e raízes de batata-doce Productive and qualitative characteristics of the vines and roots of sweet potato

    Directory of Open Access Journals (Sweden)

    Valter C de Andrade Júnior

    2012-12-01

    Full Text Available A batata-doce é uma hortaliça que se destaca pela versatilidade no uso, podendo ser empregada tanto na alimentação humana como animal. Seu cultivo é relativamente fácil e barato, o que, juntamente com sua adaptabilidade a variadas condições edafo-climáticas, viabiliza sua produção pelos agricultores familiares. Objetivou-se avaliar a produção de massa verde e massa seca da parte aérea para utilização na alimentação animal e a produtividade e a qualidade das raízes tuberosas de clones de batata-doce para utilização na alimentação humana. O delineamento experimental utilizado foi em blocos casualizados, com doze clones e quatro repetições. Foram avaliados clones de batata-doce pertencentes ao banco de germoplasma da UFVJM juntamente com as cultivares comerciais Brazlândia Roxa e Brazlândia Rosada, colhidos aos seis meses após o plantio. Foram avaliadas a produção de massa verde e massa seca da parte aérea e a produtividade e qualidade das raízes tuberosas. O clone BD-45 destacou-se na produção de massa verde, produção de massa seca e nas produtividades total e comercial de raízes com valores de 19,7; 3,3; 32,9 e 29,5 t ha-1, respectivamente. A maioria dos genótipos avaliados apresentou raízes com formato próximo ao ideal para comercialização e boa resistência a insetos de solo com valores de notas próximos a 2,0. Foram observadas diferenças significativas entre os genótipos para os teores de amido e açúcares totais e redutores. Os genótipos apresentaram composição centesimal semelhante, exceto para o teor de cinzas. Os clones BD-67 e BD-56 apresentaram teores de cinzas mais elevados que o Cambraia, e semelhantes aos demais clones.Sweet potato is a versatile vegetable which can be used both as human and animal food. The relatively easy and inexpensive cultivation of this vegetable associated with the crop adaptability to several conditions of soil and climate enable the production of sweet potato

  15. 甘薯羽状斑驳病毒外壳蛋白基因的分子变异%Molecular variation of Sweet potato feathery mottle virus coat protein gene

    Institute of Scientific and Technical Information of China (English)

    王晓华; 张振臣; 乔奇; 秦艳红; 张德胜; 田雨婷

    2012-01-01

    应用单链构象多态性(single-strand conformation polymorphism,SSCP)技术结合核苷酸序列测定的方法,对我国甘薯主产区11个省份的甘薯羽状斑驳病毒(Sweet potato feathery mottle virus,SPFMV)外壳蛋白(CP)基因的分子变异情况进行了研究.结果表明,SPFMV CP基因的RT-PCR产物表现了较丰富的图谱类型,50个分离物共产生9种主要的SSCP带型;对显示不同带型的20个样品的CP基因进行了序列测定和进化树分析,CP基因核苷酸序列一致性为77.2%~99.9%.说明这些样品的SPFMV的CP基因存在较大的分子变异,可划分为EA、RC、O和C4个株系.%Virus samples were collected from 11 provinces in China, and the molecular variation of Sweet potato feathery mottle virus (SPFMV) coat protein (CP) gene were analyzed using single-strand conformation polymorphism (SSCP) and sequence analysis. SSCP analysis of 50 isolates showed that these isolates produced 9 kinds of SSCP band forms. The results of sequence comparison and phylogenetic analysis showed that the identities of the nucleotide sequences of CP genes among these isolates were 77. 2% - 99. 9%. SPFMV CP genes of different isolates in China had great molecular variability and could be divided into four diverged groups at least, including the East Africa (EA), Russet Crack (RC), Ordinary (O) and Common , strain groups.

  16. Nutritional Improvement of Sweet Potato Residue by Solid-State Fermentation with Mixed Microbe Strains%复合益生菌固态发酵改善甘薯渣营养价值的研究

    Institute of Scientific and Technical Information of China (English)

    赵华; 王雪涛; 汤加勇; 汤小朋; 贾刚; 刘光芒; 陈小玲; 龙定彪; 王康宁

    2015-01-01

    本试验旨在研究采用多种微生物混合固态发酵对甘薯渣营养价值的影响,并探讨其最佳发酵工艺参数。采用单因素试验设计,对4类菌种共12株菌种进行单菌发酵,从中筛选1株发酵效果最优菌株作为混菌发酵的主菌种,与其他3类菌株进行不同组合发酵,筛选最佳菌种组合。采用正交试验设计,考察发酵时间、发酵温度、料水比、接种量及菌种接种比例对甘薯渣营养价值影响。结果表明:1)在发酵温度38℃,发酵时间4.5 d,料水比1∶1.3,接种量1×106个/g,接种比例黑曲霉2∶里氏木霉∶枯草芽孢杆菌1∶酿酒酵母1=1∶1∶2∶1条件下发酵效果最好。2)在混菌发酵后,以干物质为基础,粗蛋白质含量从6.37%提高到9.75%;粗脂肪含量从2.71%提高到4.92%;发酵后还原糖含量达到8.22%,羧甲基纤维素酶、滤纸酶、β-葡萄糖苷酶和淀粉酶活性分别为4.26、3.29、3.75和5.15 U/g DM。由此可见,农副产品甘薯渣经过微生物混菌固态发酵后可以有效改善其营养品质。%In this study, a solid⁃state fermentation ( SSF) using mixed microbe strains was conducted to im⁃prove the nutritional quality of sweet potato residue and the optimal fermentation parameters was investigated. A single factor experiment design was adopted to investigate the effects of 4 species, 12 strains of microbe fer⁃mentation on nutritional improvement of sweet potato residue. Four single microbial strains from each species were selected and the strain with best nutritional improvement was selected as the main strain to formulation with other three strains screened for SSF. Orthogonal experiment design was further used to optimize the fer⁃mentation parameters such as time, temperature, moisture, inoculation size and strain formulation ratio on nu⁃tritional quality improvement of sweet potato residue. The results showed

  17. 早收栽培甘薯品种浙薯132延后收获的特征特性%Characteristics of Delaying Harvested Sweet Potato Variety Zheshu 132 under Early Mature Cultivation

    Institute of Scientific and Technical Information of China (English)

    刘伟明; 吴列宏; 沈升法

    2012-01-01

    To understand the expanding and weighting dynamic of root tuber of sweet potato (Ipomoea batatas L) variety Zheshu 132 under early harvest cultivation with delayed harvest, delaying harvested potato was dug at different growth stages and observed. The results showed that except for early setting and quickly expanding of root tuber at early stages, the root tuber of Zheshu 132 also had high expanding and weighting rate at later stages, indicating that high yield of Zheshu 132 could be obtained with delayed harvest under early harvest cultivation.%为了探讨早收栽培甘薯(Ipomoea batatas L.)品种浙薯132延后收获的薯块膨大增重动态,开展了浙薯132延后收获的分期掘薯观察试验.结果表明,浙薯132不但结薯较早,前期薯块膨大快,而且后期薯块膨大增重比例也较高,其延后收获也能取得较高的产量.

  18. Effect of one-step and two-step modified method on the property of cross-linked esterification sweet potato starch%一步和二步改性法对交联酯化甘薯淀粉性质的影响

    Institute of Scientific and Technical Information of China (English)

    李倩; 高群玉; 吴磊

    2012-01-01

    Sodium trimetaphosphate was used as cross-linking agent and acetic anhydride as esterifying agent to prepare cross-linked esterification sweet potato starch through one-step and two-step modified method. The effect of one-step and two-step modified method on the property of cross-linked esterification sweet potato starch was compared in this study. As to one-step modified method,sweet potato starch slurry was adjusted to appropriate condition after being cross-linked and then esterified directly where wash, neutralization, dry was eliminated. As to two-step modified method, cross-linked sweet potato starch was well dried and smashed,which was used as the raw starch for the next step of esterification. Peak viscosity and stability were chosen as index and the result indicated that the cross-linked esterification sweet potato starch prepared by one-step modified method possess better peak viscosity and stability. The cross-linked esterification sweet potato starch prepared by two-step modified method possess better anti-precipitability and freezing-thaw resistance, slightly higher solubility, swelling power, but the difference between two methods was not obvious.%以三偏磷酸钠(STMP)为交联剂,醋酸酐为酯化剂,对甘薯淀粉进行复合变性,通过一步和二步改性法制备交联酯化改性甘薯淀粉。比较了一步和二步改性法对交联酯化甘薯淀粉性质的影响。一步法指甘薯淀粉交联后调整酯化的条件,省去水洗、中和与干燥操作工序连续进行酯化;二步法为将制备的交联淀粉粉碎干燥后作为酯化变性反应的原淀粉。以峰值粘度和稳定性为指标测定。结果表明:一步法改性的交联酯化甘薯淀粉具有更好的峰值粘度和稳定性;二步法改性的交联酯化甘薯淀粉具有更好的抗凝沉性,溶解度和膨胀度略高于一步法,抗冻融性更好,但与一步法差别不显著。

  19. 杀菌剂对甘薯致病菌Hypocrea sp.SP-4和Rhizopus stolonifer SP-1生长影响研究%Studies on Influence of Fungicide on Growth of Hypocrea sp.SP-4 and Rhizopus stolonifer SP-1 of Pathogenic Bacteria of Sweet Potato

    Institute of Scientific and Technical Information of China (English)

    段鹏; 张义正; 谭雪梅

    2011-01-01

    为了研究杀菌剂对甘薯致病菌 Hypocrea sp.SP-4和Rhizopus stolonifer SP-1生长的抑制效果,本文从腐烂的甘薯块根中分离到的匍枝根霉SP-1(Rhizopus stolonifer SP-1)和Hypocrea sp.SP-4的孢子接种在含有不同杀菌剂浓度的PDA培养基上,在13℃和28℃条件下培养.同时也将2种孢子接种在甘薯块根上,进行培养观察.结果表明:2株真菌低温条件下,在不含杀茵剂的培养皿上的生长速度明显比28℃条件下要缓慢些;甲基托布津和多茵灵对Hypocrea sp.SP-4和R.stolonifer SP-1生长抑制的稀释度分别为1000倍和500倍.在28℃条件下,2种杀菌剂对Hypocrea sp.SP-4都有良好的抑制效果,但对R.stolonifer SP-1抑制率,甲基托布津只有21%,多菌灵则有58%.在用杀菌剂抑制甘薯块根侵染的过程中还发现,甘薯块根在没有创伤的情况下,2株真菌在低温条件下不会引起腐烂,说明它们是通过伤口侵染甘薯块根的.综合几个指标可以得出:适度低温和避免甘薯块根出现伤口能够减少甘薯块根被真菌侵染.%In order to study on influence of fungicide on growth of Rhizopus stolonifer SP-1 and Hypocrea sp SP-4 of pathogenic bacteria of sweet potato, spores of Rhizopus stolonifer SP-1 and Hypocrea sp SP-4 isolated from spoilage root tuber of sweet potato were inoculated on PDA medium plate and root tuber of sweet potato including different concentrations of fungicide, and cultivated at 13℃ and 28℃. The results showed that they grew more slowly at 13℃ than 28℃. Dilution concentration of thiophanate-methyl and carbendazol to inhibit the growth of Hypocrea sp SP-4 and R. stolonifer SP-1 is 1000 and 500-fold, respectively. Both fungicides could efficiently inhibit the growth of Hypocrea sp SP-4. However, the inhibition rate of thiophanate-methyl and carbendazol to R. stolonifer SP-1 is 21% and 58%, respectively. The results also showed in the course of fungicide inhibiting the infection of root tuber of

  20. Purple and Celie

    Institute of Scientific and Technical Information of China (English)

    官宇

    2013-01-01

    In the novel The Color Purple, purple is a color that Alice Walker uses to symbolize the main character:Celie. In col⁃or psychology, purple is a complex color. At first, it has two contradictory symbolic meanings just as Celie’s personality. Second⁃ly, purple is a color which blends blue and red. In western countries, red symbolized man and blue symbolized woman. Howev⁃er, Celie is a person who has both man’s and woman’s characteristics. At last, purple is a changeable color. Celie’s early misery life is like dark purple which has more of a passive meaning. And her later life turns out to be light purple which symbolizes more of the beautiful things. And the turning of her life may be viewed as awakening of womanism.

  1. Process optimization on alcohol production using sweet potato residue by simultaneous saccharification and fermentation method%甘薯渣同步糖化发酵生产酒精的工艺优化

    Institute of Scientific and Technical Information of China (English)

    王贤; 张苗; 木泰华

    2012-01-01

    To comprehensive utilize sweet potato starch industrial waste residue, simultaneous saccharification and fermentation (SSF) method was optimized to produce alcohol using sweet potato residue. Plackett-Burman design was used to select significant factors among 9 factors which had influenced on alcohol fermentation. Based on the selected results, steepest ascent method was used to approach the optimal region and response surface methodology was adopted to identify optimal values of significant factors. The results indicated that the effects of glucoamylase, inoculation ratio and fermentation temperature on alcohol fermentation was significant (P<0.05). The optimal conditions for alcohol fermentation were as follows: α-amylase 8 U/g, liquefying time 1.5 h, liquefying temperature 90℃, mass fraction of ammonium sulfate 0.15 g/100 g, pH value 4, fermentation time 36 h, glucoamylase 151 U/g, inoculation ratio 0.3% and fermentation temperature 36℃. Under the optimum conditions, alcohol concentration was 17.15%, which was close to theoretical predicted value( 16.95%). The optimum technology provides reference for the alcohol production technology by SSF method for sweet potato residue.%为了综合利用甘薯淀粉工业废渣,本研究以甘薯渣为原料发酵生产酒精,并对其同步糖化发酵工艺(SSF)进行优化.研究同步糖化发酵时影响酒精发酵工艺的9个因素,采用Plackett-Burman试验设计筛选出显著因素,并在筛选结果的基础上,用最陡爬坡途径逼近最大响应区域,然后利用响应面分析法确定其最佳参数.结果表明,影响洒精发酵工艺的显著因素为糖化酶、接种量和发酵温度.酒精发酵优化最佳参数为:α-淀粉酶8 U/g,液化时间1.5 h,液化温度90℃,硫酸铵质量分数0.15 g/100g,pH值4,发酵时间36 h,糖化酶151 U/g,接种量0.3%,发酵温度36℃.在此条件下,验证试验得到的酒精体积分数达到17.15%,接近理论预测值16.95%.优化后的工

  2. Utilización de piensos criollos con harina de Albizia lebbeck para la ceba de conejos alimentados con bejuco de boniato Use of home-made concentrate feed with Albizia lebbeck meal for fattening rabbits fed sweet potato vines

    Directory of Open Access Journals (Sweden)

    I. L Montejo

    2010-03-01

    Full Text Available Se realizó un experimento durante 40 días en el módulo de animales menores de la Estación Experimental de Pastos y Forrajes "Indio Hatuey", con el objetivo de evaluar la inclusión de la harina de Albizia lebbeck en un pienso criollo con diferentes suplementos energético-proteicos, para la alimentación de conejos de ceba. Se utilizaron 26 animales mestizos sanos, de 60 días de edad y 0,94 (± 0,10 kg de peso, en un diseño completamente aleatorizado con dos tratamientos (13 animales por cada uno; estos fueron: A 100% bejuco de boniato (Ipomoea batata y B 70% bejuco de boniato más 30% de pienso criollo elaborado con harina de A. lebbeck y diferentes suplementos energético-proteicos. El alimento se ofreció en los horarios de la mañana (9:00-10:00 a.m. y la tarde (3:00-4:00 p.m.. Se encontraron diferencias significativas en el peso final de los animales (A-1,47 kg y B-1,62 kg. Las mejores ganancias de peso vivo se observaron en el tratamiento suplementado B (16,3 g/animal/día, que fueron superiores (PA trial was conducted for 40 days in the small animal facility of the Experimental Station of Pastures and Forages "Indio Hatuey", with the objective of evaluating the inclusion of Albizia lebbeck meal in a home-made concentrate feed with different energy-protein supplements, to feed fattening rabbits. Twenty-six healthy crossbred animals, 60 days old and with 0,94 (±0,10 kg of weight, were used in a completely randomized design with two treatments (13 animals each; they were: A 100% sweet potato (Ipomoea batata vines and B 70% sweet potato vines + 30% home-made concentrate feed elaborated with A. lebbeck meal and different energy-protein supplements. The feed was supplied in the morning (9:00-10:00 a.m. and the afternoon (3:00-4:00 p.m.. Significant differences were found in the final weight of the animals (A-1,47 kg and B-1,62 kg. The best live weight gains were observed in the supplemented treatment B (16,3 g/animal/day, which were

  3. 甘薯新品种‘龙薯13号’高产栽培技术研究%Cultivation Optimization for New Sweet Potato Variety,‘Longshu 13’

    Institute of Scientific and Technical Information of China (English)

    林子龙; 杨立明; 郭其茂; 陈根辉; 黄艳霞

    2015-01-01

    为研究食用型甘薯品种‘龙薯13号’的配套高产栽培技术,采用正交试验方法,研究密度、栽插期、不同苗段和施肥量4个因素对‘龙薯13号’产量的影响,以期获得高产的最佳组合。试验结果表明:密度、栽插期、不同苗段对甘薯产量有极显著影响,施肥量对甘薯产量有显著影响,适当提高密度(40005~49995株·hm-2)、提早栽插、采用茎蔓顶端苗和适当提高施用复合肥量(150~525 kg·hm-2)都能提高甘薯的产量。在中等地力水平条件下,当栽插密度为49995株·hm-2、7月18日栽插(生育期133 d)、采用顶端苗、施用进口复合肥525 kg·hm-2是最佳组合,能取得比其他组合更高的甘薯产量。%For high yield cultivation of the edible sweet potatoes,‘Longshu 13’,an orthogonal experimentation was conducted.Yield affected by the planting density,transplanting time,vine cuttings and fertilization was investigated for the optimization.The results indicated that the planting density,transplanting time and vine cuttings had a very significant,while the fertilization a significant,effect on the yield of the sweet potatoes.The yield could be further improved by increasing the planting density from 40 005 to 49 995 plants ·hm-2 ,planting early,using the top vines,or applying 150 to 525 kg·hm-2 of compound fertilizer.On soils of moderate fertility,the sweet potatoes could attain a high yield with the optimized conditions of a planting density of 49 995 plants·hm-2 ,planting on July 18 (with a growth period of 133 days),using the top of vines for transplant,and applying a composite fertilizer at the rate of 525 kg·hm-2 .

  4. Caracterização de variedades de batata doce (Ipomoea batatas L. através de descritores morfológicos e isoenzimáticos Morphological and isoenzymatic characterization of sweet potato (Ipomoea batatas L.

    Directory of Open Access Journals (Sweden)

    Eliane Augustin

    2000-03-01

    Full Text Available Ocorre grande variabilidade no germoplasma de batata-doce disponível no Rio Grande do Sul, mas nem todas populações podem ser caracterizadas através de aspectos morfológicos, havendo necessidade de recorrer a outros métodos, como análise de isoenzimas, para a sua diferenciação. A avaliação de características morfológicas e isoenzimáticas de dez acessos do Banco de Germoplasma de Hortaliças da Embrapa Clima Temperado foi o objetivo deste trabalho. Quatro descritores morfológicos foram utilizados, permitindo distinguir seis variedades. Análises de isoenzimas de peroxidase, aspartato transaminase e esterase foram efetuadas, utilizando-se eletroforese horizontal em gel de poliacrilamida. Foi observada similaridade máxima (1,00 estimada através do coeficiente de Jaccard, com base nesses marcadores, apenas entre as variedades Americana e Morada INTA. A análise de agrupamento permitiu a distinção de dois grupos e quatro subgrupos, utilizando UPGMA (método da média aritmética não ponderada. Os resultados obtidos permitiram a diferenciação dos dez acessos estudados e indicaram que a análise de isoenzimas associada a avaliações morfológicas é de grande valia na caracterização de germoplasma de batata-doce disponível no Rio Grande do Sul.Despite the variability observed in sweet potato germplasm found in the Rio Grande do Sul State, many populations can not be morphologically characterized without the use of additional methods, such as isoenzyme analysis. The aim of this work was to evaluate the morphological and isoenzymatic characteristics of ten accesses of the genetic resources program of Embrapa Clima Temperado. Four morphological descriptors were used, which allowed to distinguish six varieties. Polyacrylamyde electrophoresis was used to analyze peroxidase, aspartate transaminase and esterase isoenzymes. Maximum similarity (1.00, estimated through Jaccard coefficient, was observed only in comparisons between

  5. 甘薯交联抗性淀粉热力学性质与消化性研究%Thermodynamic properties and digestibility of sweet potato cross-linked resistant starches

    Institute of Scientific and Technical Information of China (English)

    李云云; 高群玉

    2012-01-01

      The thermodynamic properties of sweet potato cross–linked resistant starches and native starch were analysed synthetically based on swelling power,degrees of gelatinization and thermodynamic parameters measured by differential scanning calorimetry(DSC). In–vitro model proposed by Jenkins was investigated the digestion of starch. Results showed that swelling power, degrees of gelatinization of sweet potato cross–linked resistant starches were lower than native starch at the same temperature,and the higher dosage the crosslinking agent was,the smaller swelling power and degrees of gelatinization of starch were. The phase inversion temperature To,Tp and Tc of cross–linked resistant starch rose with increasing crosslinking agent dasage. In–vitro digestion test showed that digestibility of all the cross–linked resistant starches were lower than native starch. The total carbohydrate digestion products and the average rate of digestion of resistantstarches were decreased with increasing crosslinking agent dasage.%  根据膨胀度、糊化度及差示扫描量热仪(DSC)测得热力学参数,综合分析甘薯交联抗性淀粉和原淀粉热力学性质,并采用Jenkins提出In–vitro模型测定淀粉体外消化性.结果表明:在同一温度下,甘薯交联抗性淀粉膨胀度和糊化度均较原淀粉低,且交联剂用量越高,淀粉膨胀度和糊化度越小;DSC测试结果显示,甘薯交联抗性淀粉相转变温度To、Tp、Tc随交联剂用量增加而升高,Tc–To和△H均比原淀粉低.In–vitro消化模拟实验表明,甘薯交联抗性淀粉消化性比原淀粉低,并随交联剂含量增加,消化产物量减少,消化速度降低.

  6. Optimization of Enzyme Hydrolysis Conditions of Sweet Potato Starch by Response Surface Methodology%响应面法优化甘薯淀粉酶解条件的研究

    Institute of Scientific and Technical Information of China (English)

    李忠海; 刘建军; 钟海雁; 鲁海波; 史云丽

    2009-01-01

    Based on single - factor experiments including factors such as thermostable α - amylase dosage, time, temperature and pH in sweet potato starch hydrolysis, the response surface methodology was adopted using reducing sugar amount as evaluating indicator to optimize the process, and to establish a mathematical model. Results: The optimum hydrolysis parameters are enzyme dosage 55 U/mL, time 80 min and temperature 90 ℃. The value of reducing sugar and hydrolysis rate of starch is 3.706 g/mL and 75.33 % respectively at the optimum conditions. The drink gained after filtration of the hydrolyzed sweet potato juice has no deposition in preservation period without adding stabilizer, indicating the perfect stability of this beverage.%在加酶量、作用时间、反应温度及pH四个单因素试验的基础上,运用响应面分析法,以甘薯汁中还原糖量为评价指标,对耐高温α-淀粉酶酶解甘薯汁中淀粉的最佳工艺进行了研究,并利用统计学方法建立了耐高温α-淀粉酶酶解甘薯汁中淀粉的二次多项数学模型.结果表明,最佳酶解条件为:加酶量55 U/mL;作用时间80 min;反应温度90℃.在最佳酶解条件下,甘薯汁中还原糖量达3.706 g/100mL,淀粉的酶解率为75.33%.水解后的甘薯汁过滤制得的饮料,无需添加稳定剂,即可达到饮料稳定性的理想效果,在饮料保存期内无沉淀产生.

  7. Análisis de mortalidad, producción y adaptabilidad de clones de batata al agrosistema de Piedemonte Llanero Analisys of mortality, production and adaptability of sweet potato clones to the Piedemonte Llanero agrosystem

    Directory of Open Access Journals (Sweden)

    Ruth Rodríguez Andrade

    Full Text Available La batata [Ipomoea batatas (L. Lam], es un tubérculo perenne, del cual se han realizado diversos experimentos y ensayos sobre su uso y adaptabilidad a diferentes agroecosistemas, con el fin de potenciar su producción en Colombia. El presente ensayo hace referencia a los resultados de investigación cualitativos y cuantitativos sobre adaptabilidad en el piedemonte llanero, teniendo en cuenta las variables mortalidad y producción, evaluada esta última en términos del rendimiento en t ha-1. El estudio se llevo acabo en 2008, se efectúo mediante análisis estadísticos con la finalidad de establecer la situación de mortalidad. En relación con la producción, su evaluación se llevó a cabo en el tiempo de cosecha, tomando en cuenta el efecto margen que se causa en las etapas del cultivo y los procedimientos estadísticos pertinentes. Se concluyó que los clones con mejor adaptabilidad, mayor rendimiento doble propósito, resistencia al ataque de diferentes microorganismos y efectos edafoclimáticos propios del agroecosistema, son: 440286, 440287 y 440396. De acuerdo con lo anterior, es posible incorporar la batata en la diversificación productiva del piedemonte llanero.The sweet potato [Ipomoea batatas (L. Lam], is a perennial tuber, on which, several studies and experiments have been conducted to analyze its adaptability and use in different agro ecosystems, in order to potentialize its production in Colombia. This work refers to the results from qualitative and quantitative investigations on its adaptability to the Piedemonte Llanero, considering the variables of mortality and production, the latter evaluated in terms of yield in t ha-1. The study was carried out in 2008, using statistical analysis to establish the crop's mortality situation. Production was evaluated in the time of harvest, considering the margi