INTERESTERIFICATION KINETICS OF TRIGLYCERIDES AND FATTY-ACIDS WITH MODIFIED LIPASE IN N-HEXANE

被引:28
作者
BASHEER, S
MOGI, K
NAKAJIMA, M
机构
[1] NATL FOOD RES INST,TSUKUBA,IBARAKI 305,JAPAN
[2] NIPPON LEVER BV,TOKYO 150,JAPAN
关键词
ACIDOLYSIS; BIOCATALYST; FATTY ACIDS; INTERESTERIFICATION KINETICS; MODIFIED LIPASE; PALMITIC ACID; REACTION RATE CONSTANT; STEARIC ACID; TRIGLYCERIDES;
D O I
10.1007/BF02638850
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The kinetics of lipase-catalyzed interesterification of triglycerides and fatty acids in organic media was studied. First, the lipase Saiken 100, Rhizopus japonicus, was modified by surfactant to form an enzyme precipitate in aqueous solution, which was well dispersed in organic solvents. This modified lipase catalyzed the interesterification of tripalmitin and stearic acid. The enzyme has 1,3-positional specificity and does not distinguish between stearic and palmitic acids. The kinetic model developed to describe the interesterification reaction system is based on mass balance of two consecutive second-order reversible reactions. The reaction rate constant, k, was determined by solving the differential rate equations of the reaction system and by expressing the value of k as a function of concentrations of the substrates with time. The model gave satisfactory results. The best value of the specific reaction rate constant k* that fits all experimental data was 1.2 . 10(-5) [L(2)/(mmol . mg biocatalyst . h)] under the reaction conditions in this study.
引用
收藏
页码:511 / 518
页数:8
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