AbstractUsing commercial lipases from various microbial origins, medium‐chain glycerides, such as mono‐, di‐, and tricaprin, were synthesized in isooctane from glycerol and capric acid. The enzyme reaction was performed with 0.35 M capric acid, 0.025 M glycerol, and 0.46 g silica gel to remove water in 5 mL of isooctane with 30 mg lyophilized lipase. Of the 21 kinds of lipases, 11 showed good synthetic activities. Lipases fromPseudomonas aeruginosa (Lipase PS),Rhizomucor miehei lipase andChromobacterium viscosum lipase (Lipase CV) showed high activities for the production of tricaprin, while lipase OF‐360 (fromCandida rugosa) and lipase D (Rhizopus delemar) were good for dicaprin production. Lipases CC and MY fromC. rugosa (C. cylindracea) and lipase D (Rhizopus delemar) were good for dicaprin production. Lipases CC and MY fromC. rugosa (C. cylindracea) also showed high activities for dicaprin and tricaprin. Some lipases, especially lipase PS, had high thermal stability over 60°C. The optimal lyophilization pH to dehydrate the lipase coincides with the optimal buffer solution pH for hydrolysis.
摘要利用来自不同微
生物源的商用
脂肪酶,在
异辛烷中以
甘油和
癸酸为原料合成了单链、双链和三链
甘油酯。在 5 毫升
异辛烷中加入 0.35 毫摩尔
癸酸、0.025 毫摩尔
甘油和 0.46 克
硅胶除去
水分,再加入 30 毫克冻干
脂肪酶进行酶反应。在 21 种
脂肪酶中,有 11 种具有良好的合成活性。来自
铜绿假单胞菌的
脂肪酶(
脂肪酶 PS)、Rhizomucor miehei
脂肪酶和粘杆菌
脂肪酶(
脂肪酶 CV)在生产三
氯化苦方面表现出较高的活性,而来自白色念珠菌的
脂肪酶 OF-360 和 Rhizopus delemar 的
脂肪酶 D 在生产二
氯化苦方面表现良好。来自 C. rugosa(C. cylindracea)的
脂肪酶 CC 和 MY 以及
脂肪酶 D(Rhizopus delemar)对二卡品醇的生产有很好的效果。来自 C. rugosa(C. cylindracea)的
脂肪酶 CC 和 MY 对二卡波林和三卡波林也表现出较高的活性。一些
脂肪酶,尤其是
脂肪酶 PS,在 60°C 以上具有较高的热稳定性。
脂肪酶脱
水的最佳冻干 pH 值与
水解的最佳缓冲溶液 pH 值一致。