食品科学 ›› 2008, Vol. 29 ›› Issue (11): 403-407.

• 生物工程 • 上一篇    下一篇

交联糖化酶聚合体的制备与性质研究

 郭立泉, 张昕, 王维坚   

  1. 吉林工商学院生物工程系; 吉林大学生物与农业工程学院;
  • 出版日期:2008-11-15 发布日期:2011-12-08

Study on Preparation and Characters of Cross-Linked Glucoamylase Aggregate

 GUO  Li-Quan, ZHANG  Xin, WANG  Wei-Jian   

  1. 1.Department of Biological Engineering,Jilin Business and Technology College,Changchun 130062,China ;2.College of Biology and Agricultural Engineering,Jilin University,Changchun 130022,China
  • Online:2008-11-15 Published:2011-12-08

摘要: 交联糖化酶聚合体是利用硫酸铵沉淀糖化酶,以戊二醛为交联剂对其进行化学交联,制备出的一种无载体固定化糖化酶。本实验对交联糖化酶聚合体的制备和酶学性质进行研究。实验结果表明:交联酶聚合体的最终酶活力为3.15×104U/g干胶,其作用的最适pH4.6,最适反应温度为50℃,Km值为1.75%,当酶保护剂黄原胶的添加量为5.0mg/g时,交联糖化酶聚合体残余酶活力较高,且具有比游离酶更高的热稳定性。

关键词: 糖化酶, 交联糖化酶聚合体, 固定化

Abstract: The free glucoamylase in the 0.05 mol/L acetate-sodium acetate buffer(pH 4:6) was precipitated by ammonium sulfate and then cross-linked by glutaraldehyde to prepare glucoanylase aggregate,which is a carrier-free immobilized enzyme.The preparation process and the enzymatic characters of cross-linked glucoamylase aggregate were studied.Results showed that the final activity of the cross-linked glucoamylase aggregate is 3.15×104 U/g(dry).The optimum pH and reaction temperature as well as Km of the cross-linked glucoamylase aggregate are 4.6,50 ℃ and 1.75% respectively.As the content of xanthan gum is 5.0 mg/g(free glucoamylase),the residual activity and thermostability of the cross-linked glucoamylase aggregate are both higher than the free glucoamylase.

Key words: glucoamylase, cross-linked glucoamylase aggregate, immobilization