高等学校化学学报

高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (3): 368.

• 论文 • 上一篇    下一篇

聚硫堇修饰微带金电极的性质及对NADH的催化氧化

蔡称心, 鞠熀先, 陈洪渊   

  1. 南京大学化学系, 南京 210093
  • 收稿日期:1994-04-07 修回日期:1994-07-15 出版日期:1995-03-24 发布日期:1995-03-24
  • 通讯作者: 陈洪渊
  • 作者简介:蔡称心,男,28岁,博士研究生.
  • 基金资助:

    国家自然科学基金

Electrocatalysis of Poly-thionine Modified Microband Gold Electrode for Oxidation of Reduced Nicotinamide Adenine Dinucleotide

CAI Chen-Xin, JU Huang-Xian, CHEN Hong-Yuan   

  1. Department of Chemistry, Nanjing University, Nanjing 210093
  • Received:1994-04-07 Revised:1994-07-15 Online:1995-03-24 Published:1995-03-24

PDF (PC)

被引次数

45

摘要： 报道了硫堇在微带金电极上的电化学聚合过程,用红外光谱对聚硫堇进行了表征;研究了聚硫堇的电化学性质,发现聚硫堇在+0.5～-0.7V(vs.SCE)电位范围内有两对氧化还原峰,峰电位分别为:Epc1=-0.03V、Epa1=0.05V,Epc1=-0.24V、Epa1=-0.17V(vs.SCE).它们的式量电位Eo'随pH而变化,在弱酸性溶液中,аEo'/аpH为-29mV/pH(25℃);而在弱碱性溶液中则为-56mV/pH.聚硫堇修饰微带金电极对NADH的氧化具有催化作用,文中对电催化过程进行了探讨。

关键词: 烟酰胺腺嘌呤二核苷酸, 硫堇, 化学修饰电极, 微带金电极, 电催化

Abstract: The electrocatalytic oxidation of NADH in phosphate buffer solution (pH=7.0)by poly-thionine modified microband gold electrode was investigated.The electrochemical polymerization of thionine in acetonitrile solution and the properties of the resulting films were studied.It was found that the addition of acids such as CF3COOH to the medium markedly facilitates the film formation.The poly-thionine film was characterized by IR spectra.Two redox couple of poly-thionine in the potential range of -0.7─+0.5 V (vs.SCE)were observed,one of them possesses the monomer-type activity.The peak potentials are Epc1=-0.03 V,Epa1=0.05 V;Epc1=-0.24 Vand Epa1=-0.17 V (vs.SCE,25℃). Aslope of-29 mV/pH for the plot of Eovs. pHwas observed in acidic solution,whereas in alkaline solution the slope was -56 mV/pH.

Key words: Nicotinamide adenine dinucleotide, Thionine, Chemically modified electrode, Microband gold electrode, Electrocatalysis

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