UHT乳贮存期间蛋白变化的研究

Study on protein changes of UHT milk during storage

在UHT乳贮存期间,对其纤维蛋白酶活力、蛋白沉淀量、下层蛋白粒径、游离氨基氮含量进行测定。结果表明,随着贮存时间的延长,纤维蛋白酶活力、蛋白沉淀量、下层蛋白粒径、游离氨基氮含量变化极显著(P<0.01);贮存时间与纤维蛋白酶活力、蛋白沉淀量、下层蛋白粒径、游离氨基氮含量间均呈极显著正相关(P<0.01)。

During storage,the plasmin activity, protein precipitation, protein size,free amino nitrogen in the UHT milk were analyzed. The results showed that the plasmin activity, protein precipitation, protein size, free amino nitrogen increased during storage（ P 〈0.01 ）;higher correlation coefficient（ P 〈 0.01 ）was found during the plasmin activity, protein precipitation, protein size and free amino nitrogen.