Acidolysis between Triolein and Short-Chain Fatty Acid by Lipase in Organic Solvents
作者:Wakako TSUZUKI
DOI:10.1271/bbb.69.1256
日期:2005.1
Ten kinds of lipases were examined as biocatalysts for the incorporation of short-chain fatty acids (acetic, propionic, and butyric acids) into triolein in order to produce one kind of reduced-calorie structured lipids. Trans-esterification (acidolysis) was successfully done in n-hexane by several microbial lipases. Among them, lipase from Aspergillus oryzae was used to investigate the effects of incubation time, substrate molar ratio, and water content on acidolysis. Finally, more than 80% of triolein was incorporated by butyric acid (molar ratio of triolein to butyric acid, 1:10) in the dried n-hexane at 52 °C for 72 h. More than 90% of the products was monosubstituent, which was esterified with this short chain fatty acid at the 1-position of the glycerol moiety of triolein. These results suggest that A. oryzae lipase would be a powerful biocatalyst for the synthesis of low caloric oil, such as triacylglycerol containing a mixture of long- and short-chain aliphatic acids.
研究了十种脂肪酶作为生物催化剂将短链脂肪酸(乙酸、丙酸和丁酸)掺入三烯酚,以生产一种热量降低的结构脂。几种微生物脂肪酶成功地在正己烷中完成了反酯化(酸解)。其中,利用黑曲霉的脂肪酶研究了培养时间、底物摩尔比和含水量对酸解的影响。结果表明,在 52 °C、72 h 的干燥正己烷中,80% 以上的三油酸被丁酸(三油酸与丁酸的摩尔比为 1:10)结合,90% 以上的产物为单取代基,在三油酸甘油分子的 1 位与这种短链脂肪酸酯化。这些结果表明,A. oryzae 脂肪酶是合成低热量油类(如含有长链和短链脂肪酸混合物的三酰甘油)的一种强有力的生物催化剂。