物理化学学报 >> 1991, Vol. 7 >> Issue (02): 163-168.doi: 10.3866/PKU.WHXB19910207

研究论文 上一篇    下一篇

生物功能电极 III. 葡萄糖氧化酶的电化学固定化研究

郑智敏; 吴辉煌; 周绍民   

  1. 厦门大学化学系,物理化学研究所,厦门 361005
  • 收稿日期:1989-12-22 修回日期:1990-05-11 发布日期:1991-04-15
  • 通讯作者: 吴辉煌

Biofunctional Electrodes III. Study on Electrochemical Immobilization of Glucose Oxidase

Zheng Zhi-Min; Wu Hui-Huang; Zhou Shao-Min   

  1. Department of Chemistry and Institute of Physical Chemistry, Xiamen University, Xiamen 361005
  • Received:1989-12-22 Revised:1990-05-11 Published:1991-04-15
  • Contact: Wu Hui-Huang

摘要: 利用磷酸盐缓冲溶液中吡咯的电聚合, 将葡萄糖氧化酶(GOD)包埋在聚吡咯(PPy)基质中以构成生物功能电极。讨论了溶液pH和聚合电位对酶固定化的影响, 并用IR和交流阻抗谱对酶膜进行表征。GOD的固定化只有当pH>5.5时才能实现, 由此推测酶是以带负电的粒子嵌入PPy的。交流阻抗谱表明这一电极具有有界多孔电极的特征。探索了酶与电子传递体Fe(CN)_6~(3-)同时固定化的可行性。电化学固定化的GOD保持其生物催化活性, 酶反应表观上遵循Michealis-Menten动力学。

关键词: 酶电极, 酶固定化, 电聚合, 聚吡咯, 葡萄糖氧化酶

Abstract: By electrochemical polymerization of pyrrole in phosphate buffer, glucose oxidase (GOD) was entrapped in polypyrrole matrix (PPy) to construct the enzyme electrode. Effects of electropolymerization conditions, such as pH values and electrode potentials, on the enzyme immobilization were studied. Behavior of GOD/PPy membranes was characterized by IR and a.c. impedance spectra. The immobilization of GOD will be accomplished only if pH>5.5. It is likely that GOD enters into PPy in its entity with negative charge. Spectra of a.c. impedance show that the enzyme electrode has the features similar to porous electrodes. It was edmonstrated that the simultaneous immobilization of GOD and mediator Fe(CN)_6~(3-) is feasible. The electrcchemically immobilized GOD maintains its biocatalytic activeties, and apparently the enzymatic reaction follows Michaelis-Menten kinetics.

Key words: Enzyme electrode, Enzyme immobilization, Electropolymerization, Polypyrrole, Glucose oxidase