食品科学 ›› 2002, Vol. 23 ›› Issue (10): 50-53.

• 基础研究 • 上一篇    下一篇

果胶酶在壳聚糖上的固定化研究

 李秀锦, 仲飞, 肖月娟, 葛超, 郭红艳   

  1. 河北职业技术师范学院食品工程系
  • 出版日期:2002-10-15 发布日期:2011-12-31

Study on Immobilization of Pectinase on Chitosan

 LI  Xiu-Jin, ZHONG  Fei, XIAO  Yue-Juan, GE  Chao, GUO  Hong-Yan   

  • Online:2002-10-15 Published:2011-12-31

摘要: 本文以壳聚糖为载体,以戊二醛为交联剂,研究了果胶酶的固定化,分析了戊二醛浓度、给酶量、温度对酶固定化的影响。同时对固定化后的酶促作用条件(最适pH、温度)、米氏常数、半衰期等理化性质进行了初步测定,结果表明,在3%戊二醛,0.1mg/g湿壳聚糖的给酶量,5℃条件下,果胶酶固定化的固定率较高。酶促特性研究表明,固定化果胶酶最适温度范围较非固定化果胶酶大,最适pH和表观Km均有所下降,在4℃条件下,固定化果胶酶的半衰期约为30d。

关键词: 果胶酶, 固定化, 壳聚糖

Abstract: Pectinase was immobilized on chitosan vector by cross likage of glutaraldehyde. Effects of concentration of glutaraldehyde, amount of the enzyme and temperature on immobilization were analyzed. The enzymatic conditions (optimum pH and temprerature ), Km value and half-life of immobilized pectinase were measured. The results showed that the high rate of recovery of immobilized enzyme could be obtained under the conditions of 3% glutaraldehyde, 0.1 mg pectinase/wet chitosan and 5 ℃ temperature. The extent of the optimum temperature of immobilized pectinase was larger than non-immobilized pectinase. The optimum pH and apparent Km value of the immobilized enzyme decreased slightly. Under the 4 ℃ condition, the half-life of immobilized pectinase was 30 d.

Key words: Pectinase , Immobilization , Chitosan