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作 者:甘争艳[1] 吾满江.艾力 贾殿增[1] 夏木西卡马尔
机构地区:[1]新疆大学化学化工学院 [2]中国科学院新疆理化技术研究所,乌鲁木齐830011
出 处:《应用化学》2006年第8期902-906,共5页Chinese Journal of Applied Chemistry
摘 要:研究了无溶剂体系中脂肪酶催化的红花油水解反应,考察了水与油比、加酶量、反应温度、pH值、添加CaC l2等因素的最适值随反应时间变化的规律,并测试了水解率为9%及78%的2种水解产物中的脂肪酸与酯的碘值及酯中单甘酯含量,检验了脂肪酶在脂肪酸种类及甘油酯键位置上的专一性。结果表明,反应1 h时各因素的最适合值为m(水)∶m(油)=0.5∶1,m(酶)∶m(油)=5∶100,反应温度为35℃、pH=7.0、添加质量分数为0.2%CaC l2;而反应24 h时各因素的最适合值为m(水)∶m(油)=1∶1,m(酶)∶m(油)=1∶100,反应温度为26℃、pH=7.6、而且不加CaC l2。所用脂肪酶对脂肪酸的种类及甘油酯键的位置均无专一性。Enzymatic hydrolysis of safflower oil catalyzed by a lipase from Aspergillus niger was investigated in a solvent-free system, and the effect of reaction time on the hydrolysis was studied. In addition, the selectivity of the lipase was also examined by testing the monoglycerides content in the ester and the iodine values(IV) of the fatty acid and the ester. The experiment showed that the optimum conditions for an 1 h reaction were m ( H2O) : m (oil) = 0. 5: 1, m (lipase) : m (oil) = 5: 100, 35 ℃, pH = 7.0 and 0. 2% CaCl2 and the optimum conditions for an 24 h reaction were m(H2O):m(oil) = 1: 1, m(lipase):m(oil) = 1: 100, 26 ℃, pH =7.6 and no CaCl2. The lipase has no selectivity on either the fatty acid or the site of the ester bond on the acylglycerol.
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