羔羊皱胃酶和微生物凝乳酶部分特性的探讨  

Study on Partial Characterization of Kid Rennet and Microbease

作　　者：阮小华[1] 冯玉萍[1] 马忠仁[1] 李明生[1] 

机构地区：[1]西北民族大学生命科学与工程学院,甘肃兰州730030

出　　处：《家畜生态学报》2009年第3期28-31,共4页Journal of Domestic Animal Ecology

摘　　要：探讨了温度、pH值及金属离子(Ca2+、Al3+、Cu2+、Zn2+)等因素对羔羊凝乳酶和微生物凝乳酶凝乳活性的影响。结果表明:羔羊凝乳酶和微生物凝乳酶的最适作用温度分别为70℃和45℃;两种酶在温度分别低于60℃和50℃时,热稳定性较好;二者的最适凝乳pH值均为5,其活性随底物pH增加而下降;Ca2+、Al3+是两种酶的激活剂,Cu2+、Zn2+都是它们的抑制剂。The milk-clotting properties of kid rennet and microorganisms chymosin were investigated through temperature,pH and metal ions（Ca^2＋ ,Al^3＋ ,Cu^2＋ ,Zn^2＋） in the paper. The results show that the optimum clotting temperature of kid rennet and microorganisms chymasin are 45℃ and 70℃ respectively. When the temperature respectively low 50℃and 60℃ ,its stability on heating treatment are well. The milk- clotting activity will decrease with the increase of milk pH value;Both of the Optimum clotting pH values are 5; Al^3＋ and Ca^2＋ have obvious functions to accelerate milk coagulation. But Cu^2＋ and Zn^2＋ can keep from coagulating.

关 键 词：凝乳酶 温度 PH 金属离子 

分 类 号：S811.5[农业科学—畜牧学]