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Position: Home > Articles > Portial Purification and Properties of Rhizopus ZM-10 Lipase FOOD SCIENCE 2008,29 (3) 314-317

根霉ZM-10脂肪酶部分纯化及酶学性质研究

作  者:
李燕;连毅;陈义伦;徐静
单  位:
浙江省温州市农业科学研究院食品所;山东农业大学食品学院;温州医学院第二附属医院
关键词:
根霉;脂肪酶;己酸乙酯;纯化;酶学性质
摘  要:
本实验室以合成己酸乙酯的转化率为指标,从酒厂筛选到一株合成己酸乙酯活性较高的根霉ZM-10,本实验以该菌株为出发菌种,将其脂肪酶进行部分纯化后,研究了酶学性质。结果表明,根霉脂肪酶的最适反应温度为25℃;在20℃时具有较好的稳定性,该酶在30℃80min后,残活还有31.9%;脂肪酶在pH7.0和8.0有较好的稳定性;2mmol/L金属盐离子浓度时,Na+、Cu2+、Fe3+、EDTA对脂肪酶的活力有一定的促进作用,在5mmol/L时,除Cu2+外,其他金属离子均表现出不同程度的抑制作用;表面活性剂CTAB和Tween-80对脂肪酶活性有一定的抑制作用,SDS改善作用比较大;在最适反应条件下的动力学常数Km和Vmax分别为18.2mmol/L和625U/L。
译  名:
Portial Purification and Properties of Rhizopus ZM-10 Lipase
作  者:
LI Yan1,LIAN Yi2,CHEN Yi-lun3,XU Jing1, (1.Institute of Food, Wenzhou Academy of Agricultrual Sciences, Wenzhou 325006, China; 2.The Second Clinical Medical College, Wenzhou Medical College, Wenzhou 325035, China; 3.College of Food Science, Shandong Agricultural University, Tai'an 271018, China)
关键词:
Rhizopus;lipase;ethyl hexanoate;purification;properties
摘  要:
Using conversion rate of ethyl hexanoate as the index, a strain Rhizopus ZM-10 producing lipase was screened out from liquor factory. We studied properties of the Rhizopus lipase after partical purification. The optimum temperature of the lipase was 25℃, and was stable below 30℃. The lipase optimal pH was 7.0 and 8.0. When metal ion concentration was 2mmol/L, its activity was increased with amendment of Na+、Cu2+、Fe3+、EDTA, and when metal ion concentration was 5mmol/L, all metal ion inhibited its activity in different degree except Cu2+. The concentration of surfactants affected lipase activity, and the type of surfactants had no significant effect of lipase activtiy. The values of Km and Vmax were 18.2mmol/L and 625U/L in optimum reaction conditions.

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