高等学校化学学报

高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (10): 1765.

• 论文 • 上一篇    下一篇

阿魏酸聚合修饰玻碳电极的制备及其对NADH的催化氧化

张玉忠1,2, 赵红1, 袁倬斌1   

  1. 1. 中国科学技术大学研究生院化学部, 北京 100039;
    2. 安徽师范大学化学与材料学院, 芜湖 241000
  • 收稿日期:2002-04-23 出版日期:2003-10-24 发布日期:2003-10-24
  • 通讯作者: 袁倬斌(1938年出生),男,教授,博士生导师,从事电分析化学和毛细管电泳研究.
  • 基金资助:

    国家自然科学基金(批准号:29875027)资助

Preperation of Poly(ferulic Acid) Glassy Carbon Modified Electrode and Its Electrocatalytic Oxidation of NADH

ZHANG Yu-Zhong1,2, ZHAO Hong1, YUAN Zhuo-Bin1   

  1. 1. Department of Chemistry, Graduate School, University of Science and Technology of China, Beijing 100039, China;
    2. School of Chemistry and Material Science, Anhui NormaLUniversity, Wuhu 241000, China
  • Received:2002-04-23 Online:2003-10-24 Published:2003-10-24

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被引次数

38

摘要： 研究了阿魏酸修饰电极的制备、性质及对NADH的电催化作用.该电极在0.1mol/L磷酸缓冲溶液(pH=6.60)中,于-0.1～+0.50V(vs.Ag/AgCl)电位范围内呈现一对氧化还原峰,其式量电位E0为+0.188V(vs.Ag/AgCl),且E0随pH增加而负向移动.电子转移系数为0.496,表观电极反应速率常数(ks)为6.6s-1.电极反应的电子数为1且有1个质子参与.该修饰电极对NADH氧化具有很好的催化作用.在NADH存在下,电极过程由扩散控制,扩散系数为1.76×10-6cm2/s.NADH浓度在0.01～5.0mmol/L范围内与峰电流呈现良好的线性关系.通过计时安培法测得催化速率常数为6.82×103mol-1·L·s-1.

关键词: 烟酰胺腺嘌呤二核苷酸, 阿魏酸, 修饰玻碳电极, 电聚合, 电催化

Abstract: The preparation of poly(ferulic acid) glassy carbon modified electrode and its electrochemical properties were studied.The modified electrode gives a quasi-reversible redox peaks in 0.1 mol/Lphosphate buffer solution(pH=6.60) over the potential range from -0.1 to 0.5 V(vs.Ag/AgCl), in which the formal potential is 0.188V(vs.Ag/AgCl).The formal potential shifts in a negative direction with the increasing of pHvalues.The electrode reaction contains one electron and one proton.The PFA modified electrode shows an electrocatalytic activity for the oxidation of NADH in 0.1 mol/Lphos phate buffer solution.The apparent electron transfer rate constant(ks) and transfer coefficient for electron transfer between the electrode surface and immobilized PFA were calculated as 6.6 s-1and 0.496, respectively, the diffusion coefficient of NADH was calculated as 1.76×10-6cm2/s by using chronoamperometric results.The peak currents were proportional to the concentrations of NADH in the range of 0.01-5.0 mmol/L.Finally the heterogeneous rate constant for the oxidation of NADHon the PFAmodified electrode surface was also determined and found to be about 6.82×103 mol-1·L·s-1.

Key words: NADH, Ferulic acid, Glassy carbon modified electrode, Electropolymerization, Electrocatalysis

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