化学学报 ›› 1995, Vol. 53 ›› Issue (6): 521-525.    下一篇

研究论文

聚苯胺黄嘌呤氧化酶电极的生物电化学活性

穆绍林;薛怀国   

  1. 扬州大学师范学院化学系
  • 发布日期:1995-06-15

Bioelectrochemical activities of the polyaniline xanthine oxidase electrode

MU SHAOLIN;XUE HUAIGUO   

  • Published:1995-06-15

用电化学方法将黄嘌呤氧化酶固定在聚苯胺中以制成聚苯胺黄嘌呤氧化酶电极。该电极呈现典型的酶催化反应动力学特性。且具有快速的生物电化学响应。固定化黄嘌呤氧化酶的表观米氏常数为21×10^-^6mol.dm^-^3, 最适pH为8.4,酶催化反应的活化能为85.1kJ.mol^-^1。酶电极具有较高的稳定性。使用聚苯胺黄嘌呤氧化酶电极能可靠地测定较低的底物浓度, 如2×10^-^6mol.dm^-^3黄嘌呤。

关键词: 生物活性, 黄嘌呤, 氧化酶, 酶电极, 聚苯胺

The catalytic action of the polyaniline xanthine oxidase electrode, which was formed by immobilization of xanthine oxidase on the polyaniline film using the electrochemical method, has kinetic characteristics of the typical enzyme-catalyzed reaction. The enzyme electrode has a very fast bioelectrochemical response and high stability. The apparent Michealis constant, optimum pH and activation energy for the immobilized xanthine oxidase are 21×10^-^6mol.dm^-^3, 8.4 and 85.1kJ.mol^-^1, respectively. At a very low concentration of the substrate, such as 2×10^-^6mol.dm^-^3, xanthine can be determined reliably by using a polyaniline oxidase electrode.

Key words: BIOLOGICAL ACTIVITY, XANTHINE, OXIDASE, ENZYME ELECTRODES, POLYANILINE

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