高等学校化学学报 ›› 1994, Vol. 15 ›› Issue (5): 681.

• 论文 • 上一篇    下一篇

重氮法固定化糖化酶活力和稳定性

孔维, 周慧, 王立平, 陈尊, 李惟, 沈家骢   

  1. 吉林大学分子生物学系, 长春, 130023
  • 收稿日期:1993-07-27 修回日期:1993-12-01 出版日期:1994-05-24 发布日期:1994-05-24
  • 通讯作者: 孔维,男,26岁,硕士,讲师.
  • 作者简介:孔维,男,26岁,硕士,讲师.
  • 基金资助:

    国家自然科学基金

The Activity and Thermostability of Immobilized Glucoamylase by Diazotization

KONG Wei, ZHOU Hui, WANG Li-Ping, CHEN Zun, Li Wei, SHEN Jia-Cong   

  1. Department of Molecular Biology, Jilin University, Changchun, 130023
  • Received:1993-07-27 Revised:1993-12-01 Online:1994-05-24 Published:1994-05-24

摘要: 本文以苯氨基磺酸型多孔聚苯乙烯为载体,重氮化活化其苯氨基与糖化酶上的氨基反应。在固定化酶过程中,随反应时间的延长,不但固定化酶总活力增加,而且其比活和热稳定性也随之升高,最终可得活力为20000U/g干胶、比活为500的高活力固定化酶。该固定化酶在pH4.5、60℃无底物下保温,其半寿期是天然酶的5倍。以麦芽糖、糊精(分子量为1500)和可溶性淀粉为底物测定该固定化糖化酶活力表明:对某种孔度一定的载体固定化糖化酶存在一个最适分子量的底物。

关键词: 离子型多孔载体, 固定化酶, 糖化酶

Abstract: A method getting high activity and thermostability for the immobilized glucoamylase was found out.The glucoamylase was immobilized on porous anilino-sulfonic polystyrene beads by diazotization.The effects of immobilizing pH,immobilizing time and molecular weight of the substrate on the activity and thermostability of immobilized glucoamylase were investigated.The results obtained show that by prolonging the coupling time of diazol-protein,the activity of immobilized glucoamylase got to 20000 mg/hour g dry gel,and the thermostability was 5 times higlier than that of soluble glucoamylase.

Key words: Porous ionic carrier, Immobilized enzyme, Glucoamylase

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