Studies On The Synthesis Of Alkyl Polyglucoside Amide Catalyzed By Enzyme

Alkyl polyglucoside amide is a new kind of non-ionic surfactant which has many peculiarities of ordinary non-ionic and anion surfactants such as low surface tension, high activity, strong ability of decontamination, abundant and steady foam etc. Furthermore, it possesses excellent dermatological and environmental properties. It is used in a wide range of technical and consumer products, such as detergents, cosmetic products, food, medicine, pesticides formulations etc. It is intitled as a new world surfactant.In this thesis N-ethoxyl 6-O-stearic acyl polyglucoside amide is synthesized by two-step method using glucose and stearic acid in the presence of enzyme. Comparing with traditional one-step synthesis, it can predigest processes and reduce the wastage of energy.Emphases of this thesis are the selection of catalyst and the optimization of reaction conditions such as reaction temperature, reaction time, catalyst mass and desiccating agent mass. First, studying the catalytic efficiency of many kinds of compound, and find out that immobility enzyme candida sp. is the best catalyst in the reaction. Then the optimal reaction conditions are confirmed through orthogonal test: Reaction temperature: 40℃, Reaction time: 60h, Area of catalyst: 1.3g (per 0.01mol reaction), Mass of desiccating agent: 0.3g (per 0.01mol reaction).In this situation, transform rate of stearic acid can reach 44.68%.N-ethoxyl 6-O-stearic acyl polyglucoside amide is purified by column chromatograph. And then, IR spectra, mass spectrum and 1H NMR characterize it. Its surface tension, cmc, emulsification, moistening property are tested. It is testified that N-ethoxyl 6-O-stearic acyl polyglucoside amide has notable moistening property and fine emulsification property.