Estudo da influência do solvente, carboidrato e ácido graxo na síntese enzimática de ésteres de açúcares
| Autor: | Ariela Veloso de Paula, Heizir F. de Castro, Jayne C. S. Barboza |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2005 |
| Předmět: |
chemistry.chemical_classification
Sucrose Chromatography biology Fatty acid Alcohol Fructose General Chemistry Catalysis Solvent lcsh:Chemistry Chemistry chemistry.chemical_compound esters chemistry lcsh:QD1-999 carbohydrate biology.protein lipase Organic chemistry lipids (amino acids peptides and proteins) Lipase Sugar QD1-999 |
| Zdroj: | Química Nova, Vol 28, Iss 5, Pp 792-796 (2005) Química Nova v.28 n.5 2005 Química Nova Sociedade Brasileira de Química (SBQ) instacron:SBQ |
| ISSN: | 1678-7064 0100-4042 |
| Popis: | 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 sugars (glucose, fructose and sucrose), fatty acids (oleic, palmitic, lauric), solvents (hexane, heptane and t-butanol) and different sources of lipases in both free and immobilized forms. As a solvent t-butanol provided the best conditions to create a catalytic liquid phase in which the reaction occurs. Sugars were preferentially esterified in the following order: fructose > glucose > sucrose, depending on the enzyme preparation. For fructose no influence was found concerning de acyl donor and similar rates were achieved for all tested fatty acids. Ester synthesis was maximized for substrates containing fructose, lauric or oleic acids, t-butanol and lipase from porcine pancreas immobilized on polysiloxane-polyvinyl alcohol particles. Under such conditions molar conversions were higher than 50%. |
| Databáze: | OpenAIRE |
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