Sucrose Fatty Acid Esters
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. Composição química dos grãos e da cera foliar de variedade Glycine max (L.) Merrill cv. MG/ BR-46 Conquista cultivada sob atmosfera enriquecida de gás carbônico e temperatura elevada
The concentration of carbon dioxide (CO2) has increased in the last decades, due mainly to the combustion of fossil fuels. A gradual increase of the global temperature is expected as a consequence. Soybean is an important crop in most countries, being consumed either as human or domestic animals food. The present work is composed of two chapters, the first d
Publicado em: 07/02/2014
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2. Química Sem Fronteiras: o desafio da energia
Coal, natural gas and petroleum-based liquid fuels are still the most widely used energy sources in modern society. The current scenario contrasts with the foreseen shortage of petroleum that was spread out in the beginning of the XXI century, when the concept of "energy security" emerged as an urgent agenda to ensure a good balance between energy supply and
Quím. Nova. Publicado em: 2013
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3. Síntese de ésteres derivados de carboidratos com propriedades surfactantes utilizando lipases imobilizadas em suporte sólido
Sugar esters constitute one of the main kinds of natural surfactants. These called biosurfactants show different advantages related to the synthetic surfactants. They are easily degraded in the ground and water with low toxicity what allows their industrial use in pharmaceutical food and cosmetic products. A particular strategy about these compounds is that
Publicado em: 2006
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4. Estudo da influência do solvente, carboidrato e ácido graxo na síntese enzimática de ésteres de açúcares
The aim of this work was to gain knowledge of enzymatic processes for the synthesis fatty acid esters of sugar, with the objective to develop an enzymatic process for the preparation of non-toxic biodegradable surface-active agents derived entirely from renewable resources. A wide range of data were collected for reaction conditions involving different sugar
Química Nova. Publicado em: 2005-10
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5. Sintese de surfatantes altamente biodegradaveis pela transesterificação de esteres de acidos graxos com sacarose / Synthesis of highly biodegradable surfactantcs through the transesterification of fatty acid esters with sucrose
Foram testadas várias condições de síntese de ésteres graxos de sacarose de baixa substituição: surfatantes altamente biodegradáveis. Como reagentes, os ésteres metílicos de ácidos graxos foram obtidos por transesterificação de óleo de soja com metanol na presença de bases ou via catálise ácida a partir de ácidos graxos puros, como o palmí
Publicado em: 2005
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6. Estudo fitoquimico de algumas especies de Eleocharis R. Br. (Cyperaceae) : isolamento, elucidação estrutural e atividade biologica
Phytochemical investigation of Eleocharis acutangula, E. interstincta and E. sellowiana extracts had furnished by GC/MS eight long chain alkanes, eighteen fatty acid esters, dihydroactinidiolide, three sesquiterpenes, phytone, neophytadiene, the acetates of octadecanol and three sugars and some phtalates. Using MS, 1D- (RMNH, C, DEPT, NOESY 1D e TOCSY 1D) AN
Publicado em: 2003
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7. Comparison of anti-Vibrio activities of potassium sorbate, sodium benzoate, and glycerol and sucrose esters of fatty acids.
The effects of fatty acids and their glycerol and sucrose esters, potassium sorbate, and sodium benzoate on growth of Vibrio parahaemolyticus in laboratory media at pH 6.7 were evaluated. The minimum concentrations at which inhibition by esters of glycerol could be detected were lowest for monolaurin (5 microgram/ml) and monocaprin (40 microgram/ml); these c
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8. Antimicrobial Action of Esters of Polyhydric Alcohols
A broth dilution method was used to determine the minimal inhibitory concentration of a series of fatty acid esters of polyhydric alcohols against gram-negative and gram-positive organisms. Gram-negative organisms were not affected. Gram-positive organisms were inhibited as follows. Of the monoglycerol esters, monoglycerol laurate was the most active. Esters
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9. A Density Label for Membranes
Bromostearic acid satisfies the essential fatty acid requirement of an unsaturated fatty acid auxotroph of Escherichia coli K12. Over 55% of the fatty acids derived from lipids isolated from membranes of cells grown in bromostearate-supplemented medium contained bromine, as established by gas chromatography and mass spectrometry of the methyl esters. During
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10. Cultural Characteristics and Fatty Acid Composition of Corynebacterium acnes
A detailed study of the cultural characteristics and cellular fatty acid composition of 27 isolates of Corynebacterium acnes was performed to establish the properties by which this organism may be identified and characterized. The fatty acids were extracted directly from whole cells and examined as methyl esters by gas-liquid chromatography. Each strain poss
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11. A pathway for the biosynthesis of straight and branched, odd- and even-length, medium-chain fatty acids in plants.
Pathways and enzymes of fatty acid synthase-mediated, long-even-chain (generally C16-C20) fatty acid synthesis are well studied, and general metabolism involved in short-chain (C4-C7) fatty acid biosynthesis is also understood. In contrast, mechanisms of medium-chain (C8-C14) fatty acid synthesis are unclear. Recent work suggests involvement of chain-elongat
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12. Characterization of the fatty acid-sensitive glucose 6-phosphate dehydrogenase from Pseudomonas cepacia.
The adenosone 5'-triphosphate-insensitive glucose 6-phosphate dehydrogenase from Pseudomonas cepacia has been found to be strongly inhibited by long-chain fatty acids and their acyl coenzyme A esters, suggesting that an important role of this isoenzyme might be to provide reduced nicotinamide adenine dinucleotide phosphate for reductive steps in fatty acid s