Sample records for terpenes
from WorldWideScience.org

Sample records 1 - 16 shown.



1

Terpenos e ácidos graxos de Dipteryx lacunifera Ducke/ Terpenes and fatty acids from Dipteryx lacunifera Ducke

Vieira Júnior, Gerardo Magela; Silva, Hilris Rocha e; Bittencourt, Thaís Chaves; Chaves, Mariana H.; Simone, Carlos Alberto de
2007-01-01

Resumo em inglês This paper describes the isolation of the furanocassane-type diterpene, named vinhaticoic acid, along with beta-farnesene and spatulenol from fruit shells of D. lacunifera. Structural determinations were accomplished by chemical derivatization and spectral analysis, including 1D and 2D NMR and X-ray crystallography. The fatty portion was extracted from the fruit kernels, transesterfied and analysed by HRGC/MS. Oleic acid (75.8 ± 4.3%) was the major component. Essen (mais) tial oil extracted from the fruit shells of D. lacunifera was analysed by HRGC/MS and nine sesquiterpenes were identified; beta-farnesene (48.6%) and spatulenol (21.61%) were the major constituents.

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2

Terpenos isolados de Coussarea platyphylla Müll. Arg. (Rubiaceae)/ Terpenes isolated of Coussarea platyphylla Müll. Arg. (Rubiaceae)

Araujo, Francieli Casassa Vieira de; Marques, Fábio Gonçalves; Silva, Cleuza Conceição da; Santin, Silvana Maria de Oliveira; Nakamura, Celso Vataru; Zamuner, Maria Lucília Motinha; Souza, Maria Conceição de
2009-01-01

Resumo em inglês The phytochemical investigation of Coussarea platyphylla led to the isolation of triterpenes betulonic and betulinic acid, monoterpenes monotropein and monotropein salt, the diterpene trans-phytol and esteroids. The structures of the isolated compounds were assigned on the basis of spectroscopic data, including two-dimensional NMR methods. The antiproliferative properties against human cancer cell lines and molluscicidal activity against Biomphalaria glabrata of the crude methanolic extract and of its fractions were investigated.

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3

Terpenos com atividade inseticida: uma alternativa para o controle químico de insetos/ Terpenes with insecticidal activity: an alternative to chemical control of insects

Viegas Júnior, Cláudio
2003-05-01

Resumo em inglês Many substances from different sources have been used by men for decades to control insects. After the 2nd World War, the use of inorganic compounds have declined drastically and natural products, as well as synthetic derivatives, have been widely used instead. The search for natural alternatives have improved the development of bench top bioassays and an array of synthetic approaches for known and novel natural products that shows relevant activities as feeding supressor (mais) s and deterrents. The studies concerning mode of action and environmental impact of these substances, that may be biodegradable and selective for undesired insects, had led to the evaluation and discovery of a number of molecules, mostly terpenoids and alkaloids, that are well reported as candidates for inseticidal compounds that could be an effective alternative for insects control with a lower impact on human health, household animals and the environment.

Scientific Electronic Library Online (Portuguese)

4

Variação de terpenos em Hyptis suaveolens e seu papel na defesa contra herbívoros/ The role of terpene variation in Hyptis suaveolens in the defense against herbivores

Queiroz-Voltan, Rachel Benetti; Stubblebine, William Henry; Shepherd, George
1995-01-01

Resumo em português Acompanhou-se o desenvolvimento de populações de Hyptis suaveolens (L.) Poit. (Labiatae) em três localidades paulistas: Horto Florestal de Sumaré, Câmpus da UNICAMP (Campinas) e Fazenda Santa Genebra (Distrito de Barão Geraldo, Campinas), em 1981-83. Em cada local, escolheu-se uma população exposta à luz e outra, à sombra, com o objetivo de verificar em que fase do ciclo de vida as populações se tornavam mais suscetíveis ao ataque de herbívoros; de estimar a (mais) abundância dos herbívoros naturais e seus efeitos nas populações e a conseqüência da variação química dos monoterpenos que nelas ocorrem sobre os herbívoros. As populações tornavam-se mais suscetíveis aos herbívoros no período que antecedia a floração. Não se observou forte ataque de herbívoros nessa fase, embora se apresentassem em maior densidade. Os resultados sugerem que a variação na composição química possa afetar o desenvolvimento de herbívoros generalistas. No entanto, o Pyrausta insignatalis Guenée (Lep.-Pyralidae-Pyraustinae), provavelmente bem adaptado à planta, parece não ter sido afetado por esses terpenos. Não se detectaram diferenças entre populações expostas ao sol ou à sombra. Tais resultados apóiam a idéia de que a variabilidade química dentro de populações vegetais é importante estratégia de defesa contra herbívoros, dificultando-lhes a especialização. Resumo em inglês Populations of Hyptis suaveolens (L.) Poit. (Labiatae) were accompanied during their development in three sites: Horto Florestal de Sumaré, Campus of UNICAMP (Campinas), and Fazenda Santa Genebra (Distrito de Barão Geraldo, Campinas), all in the State of São Paulo, Brazil, from 1981 through 1983. At each site, a population exposed to full sunlight and another in the shade were studied. The objective was to evaluate, during plant development, the period when they were m (mais) ore susceptible to attack by herbivores; to consider the abundance of herbivores, and the role of variation in the chemistry of monoterpenes in the development of herbivores. Populations were more susceptible to attack by herbivores in the period preceding flowering. Heavy herbivore damage was not detected during this period, in spite of higher herbivore densities. The results suggest that the variation in chemical composition probably has an effect on the development of generalist herbivores. On the other hand, Pyrausta insignatalis Guenée (Lep.-Pyralidae-Pyraustinae) is probably well adapted to the plant and appears to be resistent to the terpenes. Differences in chemistry and differences in protection against herbivores were not observed between populations in sunny and shady sites. The results support an important role for genetic variability in populations in protection against herbivory and inhibition of specialization.

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5

Flavonóides, norisoprenóides e outros terpenos das folhas de Tapirira guianensis/ Flavonoids, norisoprenoids and other terpenes from leaves of Tapirira guianensis

Correia, Suzimone de J.; DavidI, Jorge M.; Silva, Eliezer P. da; David, Juceni P.; Lopes, Lucia M. X.; Guedes, Maria Lenise S.
2008-01-01

Resumo em inglês From hexane fraction of methanol extract of leaves of Tapirira guianensis (Anacardiaceae) were obtained lupeol, 24-methylenecycloartan-3-ol, phytol, α-amyrin, β-amyrin, sitosterol, sitostenone, glycosyl sitosterol, as well as sitosterol esterified with palmitic and stearic acids. Phytol, α-amyrin and β-amyrin esterified with fatty acids were also identified from same extract. The EtOAc extract besides the norisoprenoids (6S,7E,9S)-6,9-dihydroxy-megasti (mais) gma-4,7-dien -3-one 9-O-β-glucopyranoside and (6S,7E,9R)-6,9-dihydroxy-megastigma-4,7-dien-3-one 9-O-β-glucopyranoside also afforded kaempferol 3-O-rhamnoside, kaempferol 3-O-arabinofuranoside, quercetin 3-O-rhamnoside, and kaempferol. The structural elucidation of isolated compounds were based on UV, IR, MS, ¹H and 13C NMR data analysis.

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6

FRACIONAMENTO DE ÓLEOS DE CITROS UTILIZANDO FLUIDOS SUPERCRÍTICOS

MENDES, Marisa; OLIVEIRA, José Vladimir; ULLER, Ângela
1997-12-01

Resumo em português O objetivo deste trabalho é o estudo sobre o fracionamento do óleo de laranja. Neste sentido, o limoneno e o linalol foram considerados os componentes-chaves do óleo de laranja, representando os terpenos e compostos oxigenados, respectivamente. Para modelar os dados de equilíbrio de fases foi usada a equação de estado de Peng-Robinson, juntamente com as regras de mistura de van der Waals, uni e biparamétrica, e de Panagiotopoulos e Reid. O uso desses modelos termod (mais) inâmicos permitiu determinar as condições de temperatura e pressão que levaram aos melhores valores do par seletividade-capacidade. Resumo em inglês The objective of this work is to study the fractionation of the citrus oils, especially orange oil. The orange oil is considered to be a mixture of two main components, limonene and linalool, which represent the terpenes and oxygenated group fractions, respectively. The Peng-Robinson equation of state using the van der Waals, with one or two parameters, and Panagiotopoulos and Reid mixing rules, were used to correlate and predict the binary and ternary high pressure phase (mais) equilibria of CO2 containing systems . The use of thermodynamic models to predict the phase equilibria allowed to establish the conditions of temperature and pressure, which led to the best results of selectivities and capacities of the extraction.

Scientific Electronic Library Online (Portuguese)

7

Gênero Acosmium: composição química e potencial farmacológico/ Acosmium genus: chemical composition and pharmacological potential

Sousa Júnior, Paulo T.; Dall'Oglio, Evandro L.; Silva, Luiz Everson da; Figueiredo, Uir S.; Vieira, Paulo C.; Machado, Helen V.; Santos, Luciane G. dos
2009-03-01

Resumo em português O gênero Acosmium possui 17 espécies com distribuição geográfica que se estende do sudeste do México até o Nordeste da Argentina, sendo que a maioria das espécies está localizada no Brasil. A. dasycarpum, A. panamense, A. subelegans são as espécies mais utilizadas popularmente no tratamento de enfermidades. Uma busca na literatura, resguardando aspectos químicos e farmacológicos destas plantas, indicam atividade citotóxica, ação antitérmica, efeito hipogl (mais) icêmico, bem como tem sido usada no tratamento da doença de Alzheimer e desordens no sistema nervoso central. Investigação fitoquímica resultou principalmente no isolamento de terpenos, ácido cafêico, alcalóides do tipo diaza-adamantano e quinolizidínicos bem como pironas. Resumo em inglês The genus Acosmium is composed by c.a. 17 species, with geographic distribution from southeastern Mexico to Northwestern Argentina. Most of the species, however, are located in Brazil. A. dasycarpum, A. panamense, A. subelegans are used in folk medicine to treat several ailments. A search in the literature regarding the chemical and pharmacological aspects of these plants indicates cytotoxic activity, antithermal and hypoglycemic effects, as well as their use to treat Alz (mais) heimer's disease and CNS disorders. Phytochemical investigations resulted mainly in the isolation of terpenes, caffeic acid, diaza-adamantane and quinolizidines alkaloids as well as pyrones.

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8

Avaliação farmacognóstica de geoprópolis de Melipona fasciculata Smith da Baixada maranhense, Brasil/ Pharmacognostic evaluation of geopropolis of Melipona fasciculata Smith from Baixada maranhense, Brazil

Dutra, Richard Pereira; Nogueira, Alexandre Michel Costa; Marques, Rodrigo René de Oliveira; Costa, Maria Célia Pires; Ribeiro, Maria Nilce Sousa
2008-12-01

Resumo em português Melipona fasciculata Smith é uma abelha nativa, social e sem ferrão que produz cera, mel e geoprópolis. O presente trabalho objetivou caracterizar, do ponto de vista farmacognóstico, o geoprópolis de Melipona fasciculata, coletado em meliponários nos municípios de Arari, São Bento e São João Batista, da Baixada maranhense, no Estado do Maranhão, visando estabelecer dados para o controle de qualidade e padronização do produto. A metodologia utilizada constou d (mais) e análises sensoriais, abordagem química, perfis cromatográficos e determinação dos teores de flavonóides. Os resultados demonstram que o geoprópolis apresenta características sensoriais similares às encontradas para própolis de Apis mellifera, presença de compostos fenólicos em maior concentração, além de substâncias da classe dos terpenos e saponinas e ausência de alcalóides. Os perfis cromatográficos indicaram que a composição e concentração das substâncias químicas são diferentes entre as amostras. Os teores de flavonóides variaram de 0,17 - 2,6%, os quais para a maioria das amostras apresentaram valores acima do mínimo exigido pela legislação brasileira para própolis de Apis mellifera. Os dados encontrados sugerem que as variações qualitativa e quantitativa de flavonóides e outros constituintes químicos no geoprópolis são fortemente afetados pela flora visitada pelas abelhas, região geográfica e fatores ambientais. Resumo em inglês Melipona fasciculata Smith is a native, social, stingless bee species that produces wax, honey and geopropolis. This work aimed to do a pharmacological evaluation of Melipona fasciculata geopropolis, collected in beehives in the municipal districts of Arari, São Bento and São João Batista, in Baixada maranhense, in the state of Maranhão, Brazil, seeking to obtain basis for the quality control and standardization of the product. The methodology used included the accomp (mais) lishment of sensorial analyses, chemical approach, chromatographic profiles and determination of the flavonoids contents. The results demonstrate that the geopropolis have organoleptic characteristics similar to the ones found for the propolis of Apis mellifera, presence of phenolic compounds in larger concentration, besides substances of the class of the terpenes and saponins and absence of alkaloids. The chromatographic profiles indicated that the composition and concentration of the chemical substances are different among the samples. The flavonoids contents ranged between 0.17 - 2.6%. The content for most of the samples presented values above the minimum demanded by the Brazilian legislation for propolis of Apis mellifera. The found data suggest that the qualitative and quantitative variations of flavonoids and other chemical substances in geopropolis are strongly affected for the flora visited by the bees, geographical area and environmental factors.

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9

Estudo das folhas e caule de Hyptidendron canum(Pohl ex Benth.) Harley, Lamiaceae

Fiuza, Tatiana S.; Rezende, Maria H.; Sabóia-Morais, Simone M. T.; Tresvenzol, Leonice M. F.; Ferreira, Heleno D.; Paula, José R.
2010-05-01

Resumo em português Hyptidendron canum (Pohl ex Benth.) Harley, Lamiaceae, é utilizada popularmente como antimalárica, antiinflamatória, antiulcerativa, anti-hepatotóxica e anticancerígena. O objetivo deste trabalho foi realizar o estudo morfo-anatômico das folhas e caules e identificar as principais classes de metabólitos secundários presentes nas folhas de H. canum, dados ainda não descritos na literatura. As folhas e caules jovens coletados em Goiânia (GO) foram seccionados à m (mais) ão livre e preparados para análise microscópica. Foram realizadas reações de identificação de metabólitos secundários do material dessecado e pulverizado. Preparou-se o extrato etanólico bruto, que posteriormente foi fracionado por partição líquido-líquido com hexano, clorofórmio e acetato de etila. As frações foram submetidas à análise cromatográfica em camada delgada (CCD). As lâminas foliares apresentam epiderme adaxial constituída por células poligonais com parede reta. Na epiderme abaxial observam-se células com parede reta a ondulada e estômatos diacíticos e anisocíticos. Tricomas tectores e glandulares estão presente em ambas as faces da lâmina foliar. O pecíolo apresenta aspecto canaletado, epiderme adaxial e abaxial unisseriada. O caule, em secção transversal possui contorno em geral quadrangular, com presença de tricomas tectores e glandulares. As reações e a CCD das folhas evidenciaram a presença de flavonóides, saponinas, terpenos e lignanas. Este trabalho contribuiu para um maior conhecimento da morfo-anatomia e das classes químicas presentes em H. canum. Resumo em inglês Hyptidendron canum(Pohl ex Benth.) Harley, Lamiaceae, is popularly used as an antimalarial, anti-inflammatory, antiulcerative, antihepatotoxic and anticancer agent. The goal of this research was to perform the morphoanatomy study of H. canumleaves and stem and identify the main classes of secondary metabolites present in the of H. canumleaves. Such data have not been reported in the literature. The young leaves and stems were collected in Goiânia (GO), hand sectioned and (mais) prepared for microscope analysis. Reactions were performed for the identification of secondary metabolites of the dried and pulverized material. The crude ethanol extract was prepared and then fractioned by liquid-liquid partition with hexane, chloroform and ethyl acetate. Thin layer chromatography (TLC) analysis was performed on the fractions. The leaf blades presented adaxial epidermis constituted of polygonal cells with straight walls. On the abaxial epidermis cells with straight to wavy walls and diacytic and anisocytic stomates were noted. Non-glandular and glandular trichomes are present on both faces of the leaf blade. The petiole is grooved, and it presents single layered adaxial and abaxial epidermis. The cross section of the stem presents a generally quadrangular contour with the presence of non-glandular and glandular trichomes. The leaf reactions and TLC evidenced the presence of flavonoids, saponins, terpenes and lignanes. This works helps to increase knowledge of the morphoanatomy and the chemical classes present in H. canum.

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10

Aplicação das classificações do sistema de informação estatística brasileiro à cadeia produtiva óleo-suco-citrícola nacional/ Application of the Brazilian statistical information system classifications to the national citrus oil-juice productive chain

Santos, Adailson da Silva; Santos, Leila Costa de Souza
2011-01-01

Resumo em português O trabalho aborda a aplicação das classificações do Sistema de Informação Estatística em vigência no Brasil na cadeia produtiva agroindustrial, preenchendo assim uma lacuna existente na literatura das ciências agrárias. Devido ao seu destaque no setor, em termos de produção/ comercialização/ exportação, selecionou-se a cadeia produtiva da indústria brasileira óleo-suco-citrícola. O objetivo é identificar o posicionamento de cada classificação na cade (mais) ia e as demandas a jusante e a montante para cada atividade e produto. Considerando o sistema estatístico, foi analisada a Classificação Nacional de Atividades Econômicas (CNAE) e a Nomenclatura Comum do Mercosul (NCM). Foram consultadas as informações estatísticas do Instituto Brasileiro de Geografia e Estatística (IBGE) e da Organização das Nações Unidas (ONU), além da específica literatura científica. De modo geral, essas classificações de atividades econômicas e produtos não são mutuamente excludentes, mas podem sobrepor-se umas às outras com relativa facilidade e mínima intervenção. Apesar das muitas segmentações existentes, tanto a cadeia produtiva, quanto as classificações deste trabalho encontram-se corretamente definidas. Os elos da cadeia produtiva da indústria óleo-suco-citrícola brasileira envolvem estas atividades: cultivo, produção, colheita, processamento dos sucos e afins, aproveitamento industrial de subprodutos e resíduos/refugos, packing houses, distribuição, comercialização e consumo. Os produtos são: insumos agrícolas, a laranja (fruta), os sucos, óleos essenciais, águas aromáticas, terpenos, terpenoides, limoneno, perfumes e cosméticos. Resumo em inglês This paper addresses the application of the Statistical Information System classifications in force in Brazil in the agro-industrial production chain, thus filling a gap in the literature of agricultural sciences. Due to its prominence in the sector, in terms of production / marketing / exports, it was selected the productive chain of the oil-juice-citrus Brazilian industry. The goal is to identify each classification position in the chain and downstream and upstream dema (mais) nds for each activity and product. Considering the statistical system, it was analyzed the National Classification of Economic Activities (CNAE) and the Mercosul Common Nomenclature (NCM). It was consulted the statistical information of the Brazilian Institute of Geography and Statistics (IBGE) and the United Nations (UN), besides the specific scientific literature. In general, these classifications of economic activities and products are not mutually exclusionary but can overlap each other with relative ease and minimal intervention. Despite the many existing segmentation, both the supply chain and the classifications from this work are set correctly. The productive chain of the oil-juice-citrus Brazilian industry involves these activities: cultivation, production, harvesting, processing of juices and related, industrial utilization of by-products and waste / scrap, packing houses, distribution, marketing and consumption. The products are: agricultural inputs, orange (fruit), juices, essential oils, aromatic waters, terpenes, terpenoids, limonene, fragrance and cosmetics.

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11

Potencial alelopático da parte aérea de Senna occidentalis (L.) Link (Fabaceae, Caesalpinioideae): bioensaios em laboratório/ Allelopathic potential of aerial parts of Senna occidentalis (L.) Link (Fabaceae, Caesalpinioideae): Laboratory bioassays

Cândido, Ana Carina da Silva; Schmidt, Valerí; Laura, Valdemir Antônio; Faccenda, Odival; Hess, Sônia Corina; Simionatto, Euclésio; Peres, Marize Terezinha Lopes Pereira
2010-03-01

Resumo em português A bioatividade das frações semipurificadas (hexânica, acetato de etila e etanol-água) do extrato etanólico das partes aérea de S. occidentalis foi avaliada através de ensaios de germinação e de crescimento de Lactuca sativa (alface), Lycopersicon esculentum (tomate), Allium cepa (cebola) e Triticum aestivum (trigo), em laboratório. Foram utilizadas três concentrações (250, 500, 1000 mg L-1) de cada fração e um controle não tratado, com quatro repetições (mais) de 50 sementes. Os bioensaios de germinação revelaram que todas as frações atrasaram a germinação de alface, tomate e cebola, e as frações hexânica e acetato de etila reduziram a germinabilidade de tomate e cebola. Nos bioensaios de crescimento, a fração hexânica estimulou o crescimento da raiz e inibiu o crescimento do hipocótilo das eudicotiledôneas. A mesma fração inibiu o crescimento da raiz e do coleóptilo das monocotiledôneas. A fração acetato de etila inibiu o crescimento da raiz das plântulas-alvo e o hipocótilo/coleóptilo de tomate e cebola. A fração etanol-água estimulou o crescimento da raiz de tomate e do hipocótilo de alface e inibiu o crescimento da raiz de cebola e trigo e, também, do coleóptilo de cebola, na concentração de 1000 mg L-1. Nos bioensaios com herbicidas comerciais foram observados efeitos semelhantes àqueles obtidos na germinação pelas frações e no crescimento pelas frações hexânica e acetato de etila. Na cromatografia em camada delgada, foram detectados terpenos na fração hexânica, compostos fenólicos e alcalóides na fração acetato de etila. A análise espectrofotométrica revelou que a fração acetato de etila possui o maior conteúdo de compostos fenólicos e flavonóides. Resumo em inglês The bioactivity of semipurified fractions (hexane, ethyl acetate and ethanol-water) obtained from S. occidentalis aerial-part ethanol extract was evaluated by germination and growth bioassays using Lactuca sativa (lettuce), Lycopersicon esculentum (tomato), Allium cepa (onion) and Triticum aestivum (wheat), in the laboratory. Three concentrations of each fraction (250, 500, 1000 mg L-1) and untreated control were used, on four replicates of 50 seeds each. Germination bioa (mais) ssays revealed that lettuce, tomato and onion germination were delayed by all tested semipurified fractions, and tomato and onion germination were inhibited by the hexane and ethyl acetate fractions. In growth bioassays, the hexane fraction stimulated root growth and inhibited hypocotyl growth in the eudicots. The same fraction inhibited root and coleoptile growth of the assayed monocots. The ethyl acetate fraction inhibited seedling roots and hypocotyl/coleoptile growth, of tomato and onion. The ethanol-water fraction stimulated tomato root growth and lettuce hypocotyl growth, and inhibited onion and wheat root and onion coleoptile development at 1000 mg L-1. Bioassays performed with commercial herbicides presented similar results to those observed in germination to the semipurified fractions in the growth by hexane and ethyl acetate fractions. The layer chromatography revealed that the tested hexane fraction contains terpenes, and the ethyl acetate fraction has phenolic compounds and alkaloids. The spectrophotometric analysis revealed greater yields of phenolic compounds and flavonoids in the ethyl acetate fraction.

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12

Variação química do óleo essencial de Hyptis suaveolens (L.) Poit., sob condições de cultivo/ Chemical variation in the essential oil of Hyptis suaveolens (L.) Poit., under cultivation condition

Martins, Felipe Terra; Santos, Marcelo Henrique dos; Polo, Marcelo; Barbosa, Luiz Cláudio de Almeida
2006-12-01

Resumo em inglês This study was performed to establish the correlation between the growth conditions and essential oil composition of Hyptis suaveolens from Alfenas (MG), Brazil. The plants were grown in a greenhouse, four treatments were used and they were harvested at two different periods of time (60 and 135-day-old plants). The essential oil composition was determined by GC-MS analysis. The terpenes spathulenol, globulol, dehydroabietol, a-cadinol and beta-phellandrene were the major (mais) constituents found in the essential oil. Oxygenated sesquiterpenes represented the main group of constituents in most of the treatments. The major changes in the essential oil composition were found in 135-day-old plants grown under NPK deficiency. We also identified three groups of volatile components that have not been previously described in H suaveolens.

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13

Plantas do gênero Bauhinia: composição química e potencial farmacológico/ Plants of the genus Bauhinia: chemical composition and pharmacological potential

Silva, Karina Luize da; Cechinel Filho, Valdir
2002-05-01

Resumo em inglês Plants of the genus Bauhinia (Leguminosae) are widely distributed in most tropical countries and have been frequently used in folk medicine to treat several ailments, especially diabetes. In recent years, the interest in these plants has increased considerably in all world. This review shows the main chemical and pharmacological aspects of these plants. The studies carried out with the extracts and purified compounds from these plants support most of their reported therap (mais) eutic properties. It also gives an account of some compounds including terpenes, steroids and flavonoids that were isolated from the genus Bauhinia.

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14

Extrações de óleos de sementes de citros e suas atividades sobre a formiga cortadeira Atta sexdens e seu fungo simbionte/ Citrus seed oils extractions and their activity against leaf cutting ant Atta sexdens and its symbiotic fungus

Fernandes, João B.; David, Valmir; Facchini, Patrícia H.; Silva, M. Fátima das G. F. da; Rodrigues Filho, Edson; Vieira, Paulo C.; Galhiane, Mário S.; Pagnocca, Fernando C.; Bueno, Odair C.; Hebling, M. José; Victor, Sandra R.; Santos, Ana Maria Rodrigues dos
2002-12-01

Resumo em inglês Seeds Citrus oils (C. sinensis, C. limon and C. reticulata) extraction with hexane in a soxhlet apparatus and through supercritical fluid (CO2) were done. Besides triglycerides, the oils obtained with hexane comprised volatile compounds such as terpenes and fatty alcohols, esters, and aldehydes. However, the oils obtained by extraction with supercritical fluid presented only triglycerides. These results indicate that the extraction using supercritical fluid presents bette (mais) r selectivity. The activity of the oils on the development of the ant symbiotic fungus, Leucoagaricus gongylophorus, showed week activity and the topic insecticide assay showed better activity for the tangerine seed oil.

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15

Efeito da presença e concentração de compostos carbonílicos na qualidade de vinhos/ Effects of carbonylic compound presence and concentration on wine quality

Azevêdo, Luciana C. de; Reis, Marina M.; Silva, Luciana A. da; Andrade, Jailson B. de
2007-01-01

Resumo em inglês Studies on identification of compounds that make up the aroma and flavor in wines involve research evaluating mainly the influence of terpenes, esters, lactones and alcohols upon these sensory characteristics. However, carbonylic compounds (CC) play an important role concerning the substances that impact aroma to these drinks. Their origin is reported to be linked to the grape's chemical composition, must fermentation or micro-oxidation occurring during storage in barrels (mais) . Some CCs, like E-ionone, E-damascenone, siryngaldehyde, can contribute a pleasant aroma and improve the wine quality whereas others are responsible for unpleasant characteristics (acetaldehyde, furfural, 5-hydroxy-methyl furfural, diacetil, E-non-2-enal, etc). A fraction of CCs present is associated with bisulfite ions in the form of hydroxyalkylsulfonic acids. Some of them are stable and play an important role in determining wine quality. The reaction involving the formation of this aduct commonly occurs with CCs of low molar mass, such as formaldehyde and acetaldehyde. The reaction involving CCs with more than three carbon atoms demands further studies.

Scientific Electronic Library Online (Portuguese)

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Composição química volátil, em diferentes estádios de maturação, de manga 'Tommy Atkins' produzida no Vale do São Francisco/ Volatile chemical composition of mango fruit 'Tommy Atkins', cultivated in São Francisco Valley, at different stages of maturity

Canuto, Kirley Marques; Souza Neto, Manoel Alves de; Garruti, Deborah dos Santos
2009-01-01

Resumo em inglês The effect of the maturation stages on the volatile chemical composition of mango fruit cv. Tommy Atkins, cultivated in São Francisco Valley, was investigated using SPME. GC/MS and GC-FID analysis allowed the identification of 32 compounds, consisting mainly of monoterpenes. δ-3-Carene was the major component in all the stages, while α-terpinolene, trans-β-caryophyllene e α-pinene succeded each other as the second most abundant constituent, during the (mais) ripening. The aroma of the ripe fruit was characterized by presence of short-chain ethyl esters (C2-C6), whereas the green mango contained the highest concentration of δ-3-carene. Furthermore, some terpenes were detected exclusively at one of the stages.

Scientific Electronic Library Online (Portuguese)