化学学报 ›› 1995, Vol. 53 ›› Issue (3): 286-290. 上一篇    下一篇

研究论文

细胞色素c在微带金电极上的直接电化学

蔡称心;鞠煜先;陈洪渊   

  1. 南京大学化学系
  • 发布日期:1995-03-15

Direct electrochemistry of cytochrome c at a microband gold electrode modified with 4,6-dimethyl-2-mercaptopyrimidine

CAI CHENGXIN;JU YUXIAN;CHEN HONGYUAN   

  • Published:1995-03-15

报道了一种新的促进剂4,6-二甲基-2-巯基嘧啶(DMMP)对细胞色素c(Cyt.c) 电化反应的促进作用,用红外光谱和光电子能对DMMP 在金电极表面形成的单分子膜进行了表征.循环伏安实验表明Cyt.c在DMMP修饰微电极上能发生准可逆的电化学反应,异相电子传递速率常数K~5为6.6×10^-^3cm/s,对DMMP修饰膜的稳定性进行了考察;讨论了Cyt.c发生电化学反应的异相电子传递速率常数K~5受电极, 表面促进剂的修饰量以及空气中氧影响的机理.

关键词: 红外分光光度法, 光电子谱法, 电化学反应, 化学修饰电极, 促进剂, 单分子膜, 循环伏安法, 金电极, 细胞色素c, 二甲基巯基嘧啶

The direct electrochem. of cytochrome c at microband gold electrode modified with a new promoter 4,6-dimethyl-2-mercaptopyrimidine was investigated. The self-assembly monolayer of 4,6-dimethyl-2-mercaptopyrimidine on the surface of gold electrode was characterized by IR spectrum and XPS. Cyclic voltammetric experiments indicated that the electrochem. of cytochrome c at gold electrode modified with this promoter was quasi-reversible with one-electron transfer reaction. The heterogeneous electron-transfer rate constant, ks, of cytochrome c was evaluated to be ca. 6.6?0-3cm/s. The effects of the immersion time and the oxygen in air on the promoter to promote the direct electrochem. of cytochrome c were discussed.

Key words: INFRARED SPECTROPHOTOMETRY, PHOTOELECTRON SPECTROSCOPY, ELECTROCHEMICAL REACTION, CHEMICAL MODIFIED ELECTRODE, ACCELERATORS, MONOMOLECULAR FILMS, CYCLOVOLTAMGRAPH

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