食品科学 ›› 2008, Vol. 29 ›› Issue (7): 231-234.

• 生物工程 • 上一篇    下一篇

海绵态壳聚糖固定化单宁酶及其酶学性质研究

刘冠卉,马海乐,屠洁,孙丹丹   

  1. 江苏科技大学生物与环境工程学院; 江苏大学食品与生物工程学院; 江苏科技大学生物与环境工程学院 江苏镇江212018江苏大学食品与生物工程学院; 江苏镇江212013; 江苏镇江212013江苏省农产品生物加工与分离工程技术研究中心; 江苏镇江212018
  • 出版日期:2008-07-15 发布日期:2011-07-28

Study on Immobilization of Tannase on Chitosan Sponge and Its Enzymatic Characters

 LIU  Guan-Hui, MA  Hai-Le, TU  Jie, SUN  Dan-Dan   

  1. 1.College of Biology and Environment Engineering, Jiangsu University of Science and Technology, Zhenjiang 212018, China; 2.College of Food and Biology Engineering, Jiangsu University, Zhenjiang 212013, China; 3.Jiangsu Provincial Research Center of Bio-Processing and Separation Engineering, Zhenjiang 212013, China
  • Online:2008-07-15 Published:2011-07-28

摘要: 以海绵态壳聚糖为载体,0.25%戊二醛为交联剂固定化单宁酶,确定固定化酶的最佳工艺参数为:给酶量6mg/g载体、固定化pH5.0、固定化温度4℃、固定化时间8h。制备的固定化单宁酶Km为3.83mmol/L,而游离酶的Km为33mmol/L。固定化酶的热稳定性、酸碱稳定性均高于游离酶,稳定pH范围向酸性方向偏移。

关键词: 单宁酶, 壳聚糖, 固定化

Abstract: Tannase was immobilized on chitosan sponge using glutaraldehyde as cross-linking reagent. The immobilization conditions were optimized as following: 6 mg tannase immobilized on 1 g chitosan sponge under pH 5.0 and 4 ℃ for 8 hours. On the optimal conditions the enzyme activities and stability are both the highest. The Km value of the immobilized tannase is 3.83 mmol/L, while that of the free tannase is 33 mmol/L. As far as the stabilities to pH and heat changing are concerned, the immobilized tannase is also superior to free tannase, and the stable pH range is wider, especially on the low side.

Key words: tannase, chitosan, immobilization