期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 240, 期 1-3, 页码 75-82出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2004.02.016
关键词
biosurfactants; sophorolipids; sophorolipid esters; surface tension; adsorption
Biosurfactants made by fermentation from renewable resources provide environmental friendly processes and products. A natural sophorolipid mixture was produced by the yeast Candida bombicola when cultured on glucose and oleic acid. The sophorolipid mixture was chemically modified to form the corresponding sophorolipid alkyl (methyl, ethyl, propyl, and butyl) esters by reaction with the corresponding sodium alkoxides. Interfacial properties of these surfactants, such as surface tension reduction, aggregation, and adsorption, were systematically studied. It was found that the critical micelle concentration of sophorolipid esters decreases to about 1/2 per additional one CH2 group to the alkyl ester moiety. Interestingly, these surfactants were found to adsorb strongly on alumina but weakly on silica. They have properties that make them attractive candidates for uses in detergents, cosmetics, soil remediation, and enhanced oil recovery. (C) 2004 Published by Elsevier B.V.
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