Sample records for GLICOLES (glycols)
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Sample records 1 - 20 shown. Select sample records:



1

NUEVA RUTA DE SÍNTESIS DE GLICOLES A PARTIR DE ACEITES VEGETALES INSATURADOS EMPLEANDO CATALIZADORES ÁCIDOS HETEROGÉNEOS/ NEW SYNTHESIS ROUTE FOR GLYCOLS FROM UNSATURATED VEGETABLE OILS USING HETEROGENEOUS ACIDIC CATALYSTS

SUÁREZ M, Ricardo; RIOS, Luis A; Restrepo V, Gloria
2007-07-01

Resumen en español Las estructuras únicas y las características físicas de las grasas proporcionan una amplia gama de aplicaciones; las insaturaciones reactivas de ciertos ácidos grasos se explotan para generar compuestos con mayor diversidad de aplicación (industria farmacéutica, cosmética, alimenticia, etc.). En este trabajo se reportan los resultados obtenidos en la hidroxilación de oleato de metilo (9-Octadecenoic acid, methyl ester) mediante un proceso que consiste en producir (mas) un epóxido usando el método de Prileschajew, y apertura de dicho epóxido con agua. Para ambas etapas se investigó el uso de catalizadores ácidos heterogéneos meso- y macro-porosos de tipo resinas de poliestireno sulfonadas (Amberlite IR120, Amberlyst 15, Dowex50X2). Los resultados indican que para la hidroxilación selectiva de aceites vegetales con ácidos percarboxílicos y catálisis ácida heterogénea, es decisivo maximizar el contacto del compuesto intermedio (epóxido) con los sitios ácidos, lo cual puede ser logrado con resinas ácidas con bajo nivel de entrecruzamiento (bajo porcentaje de DVB) o con alta área superficial; además, la producción de glicoles se ve favorecida selectivamente con solventes apróticos con alta constante dieléctrica. Resumen en inglés Unique structures of fats and oils, together with their physical characteristics provide them a large range of applications; the reactive unsaturated fatty acids are commonly used to generate compounds with greater diversity of application (pharmaceutical, cosmetics and food industries). Results obtained in the hydroxylation of methyl oleate (9-Octadecenoic acid, methyl ester) by producing the epoxide, using Prileschajew reaction, and the following epoxide opening with wa (mas) ter are presented. For both stages the use of heterogenous meso- and macroporous acidic catalysts based on resins of sulfonated polystyrene (Amberlite IR120, Amberlyst 15, Dowex50X2) was investigated. To provide a selective hydroxylation of vegetal oils with percarboxylic acids and heterogenous acidic catalysts, the crucial issue is to maximize the contact of the intermediate compound (epoxide) with the acidic sites. This can be achieved with acid resins with low cross-linking level (low DVB content) or with high superficial area. In addition, glycols production is selectively favored with the use of aprotic solvents with high dielectric constant.

Scientific Electronic Library Online (Spanish)

5

Soybean oil microemulsions with oleic acid/glycols as cosurfactants

Comelles, Francesc; Sánchez-Leal, Joaquim; González, Juan José
2005-07-01

Digital.CSIC (Spain)

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8
10

Rapid non-enzymatic HPLC determination of total MHPG in human plasma

Ortiz, Jordi; Martínez, Emili; Gelpí, Emili; Artigas, Francesc
1990-01-01

Digital.CSIC (Spain)

12

Photothermal characterization and stability analysis of polymeric dye lasers

Duchowicz, Ricardo; Scaffardi, Lucía B.; Costela González, Ángel; García Moreno, Inmaculada; Sastre Muñoz, Roberto; Acuña Fernandez, Alberto Ulises
2000-01-01

Digital.CSIC (Spain)

13

Photothermal analysis of polymeric laser materials excited at different pump rates

Duchowicz, Ricardo; Scaffardi, Lucía B.; Costela González, Ángel; García Moreno, Inmaculada; Sastre Muñoz, Roberto; Acuña Fernandez, Alberto Ulises
2003-01-01

Digital.CSIC (Spain)

17

Is there any detrimental effect when a chestnut hydrolysable tannin extract is included in the diet of finishing lambs?

Frutos, Pilar; Raso, Miguel; Hervás, Gonzalo; Mantecón, Ángel R.; Pérez, V.; Giráldez, Francisco Javier
2004-01-01

Digital.CSIC (Spain)

18

Is the anthelmintic effect of heather supplementation to grazing goats always accompanied by antinutritional effects?

Frutos, Pilar; Moreno Gonzalo, Javier; Hervás, Gonzalo; García, Urcesino; Ferreira, Luis M.; Celaya, Rafael; Toral, Pablo G.; Ortega Mora, Luis M.; Ferre, Ignacio; Osoro, Koldo
2008-07-22

Digital.CSIC (Spain)

22

Increasing plant vigour and tomato fruit yield under salinity by inducing plant adaptation at the earliest seedling stage

Parra, Margarita; Albacete, Alfonso; Martínez-Andújar, Cristina; Pérez-Alfocea, Francisco
2007-05-01

Digital.CSIC (Spain)

23

Increasing plant vigour and tomato fruit yield under salinity by inducing plant adaptation at the earliest seedling stage

Parra, Margarita; Albacete, Alfonso; Martínez-Andújar, Cristina; Pérez-Alfocea, Francisco
2007-05-01

Digital.CSIC (Spain)

26

Elenoside increases intestinal motility

Navarro, Eduardo; Alonso, Jesús; Navarro, Ricardo; Trujillo, Juan M.; Jorge, Elena
2006-11-28

Digital.CSIC (Spain)

27

Effects of the use of heather as anthelmintic in goats infected with Trichostrongylus colubriformis on ruminal fermentation and digestibility

Frutos, Pilar; Hervás, Gonzalo; Celaya, Rafael; Moreno Gonzalo, Javier; Rodríguez, Ana Belén; García, Urcesino; Ferre, Ignacio; Ortega Mora, Luis M.; Osoro, Koldo
2009-10-01

Digital.CSIC (Spain)

28

Effect of two types of tannin, in the presence or absence of PEG, on in vitro rumen fermentation in goats

Hervás, Gonzalo; Álvarez del Pino, María C.; Giráldez, Francisco Javier; Mantecón, Ángel R.; Frutos, Pilar
2001-01-01

Digital.CSIC (Spain)

29

Effect of tannic acid on rumen degradation and intestinal digestion of treated soya bean meals in sheep

Hervás, Gonzalo; Frutos, Pilar; Serrano, Emma; Mantecón, Ángel R.; Giráldez, Francisco Javier
2000-01-01

Digital.CSIC (Spain)

30

Crystal structure of minoxidil at low temperature and polymorph prediction

Martín-Islán, Africa P.; Martín-Ramos, Daniel; Sainz-Díaz, C. Ignacio
2007-08-22

Digital.CSIC (Spain)

31

Comparison of biological and chemical methods, and internal and external standards, for assaying tannins in Spanish shrub species

Álvarez del Pino, María C.; Hervás, Gonzalo; Mantecón, Ángel R.; Giráldez, Francisco Javier
2005-01-01

Digital.CSIC (Spain)

32

Chemo-Enzymatic Syntheses of Polyester-Urethanes

Barrera-Rivera, Karla A.; Marcos-Fernández, Ángel; Martínez-Richa, Antonio
2010-01-01

Digital.CSIC (Spain)

33

Characterization of Galactosyl Derivatives Obtained by Transgalactosylation of Lactose and Different Polyols Using Immobilized beta-Galactosidase from Aspergillus oryzae

Irazoqui, Gabriela; Giacomini, Cecilia; Batista-Viera, Francisco; Brena, Beatriz M.; Cardelle-Cobas, Alejandra; Corzo, Nieves; Jimeno, M. Luisa
2009-01-01

Digital.CSIC (Spain)

34

Behavioural response of Triatoma infestans (Klug) (Hemiptera: Reduviidae) to quinazolines

Alzogaray, R. A.; Fontán, A.; Camps Díez, Francisco; Masuh, H.; Santo Orihuela, P.; Fernández, D.; Cork, A.; Zerba, E.
2005-09-30

Digital.CSIC (Spain)

36

Activation in the family of Candida rugosa isolipases by polyethylene glycol

Otero, Cristina; Fernández-Pérez, Mónica; Hermoso, Juan A.; Martínez-Ripoll, Martín
2005-06-11

Digital.CSIC (Spain)

37
38

A convenient and chemoselective one-pot oxidation/Wittig reaction for the C2-homologation of carbohydrate-derived glycols

Pinacho Crisóstomo, Fernando R.; Carrillo Fumero, Romen; Martín, Tomás; García-Tellado, Fernando; Martín, Víctor S.
2005-10-22

Digital.CSIC (Spain)