高等学校化学学报

高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (4): 591.

• 论文 • 上一篇    下一篇

单分子层γ-氨基丁酸共价修饰玻碳电极同时测定多巴胺、尿酸和抗坏血酸

张雷, 林祥钦   

  1. 中国科学技术大学化学系, 合肥 230026
  • 收稿日期:2001-12-27 出版日期:2003-04-24 发布日期:2003-04-24
  • 通讯作者: 林祥钦(1946年出生),男,教授,博士生导师,从事电分析化学研究.E-mail:xqlin@ustc.edu.cn E-mail:xqlin@ustc.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:20075025);中国科学院重大基金(批准号:9002KJ951-A1-507)

A Novel γ- Aminobutyric Acid Monolayer Modified Glassy Carbon Electrode for Simultaneous Determination of Dopamine, Uric Acid and Ascorbic Acid

ZHANG Lei, LIN Xiang Qin   

  1. Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
  • Received:2001-12-27 Online:2003-04-24 Published:2003-04-24

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摘要： 采用电氧化法制备了一种新型γ-氨基丁酸(ABA)修饰的玻碳电极.X射线光电子能谱(XPS)和循环伏安法研究表明,ABA以单分子层状态以C—N键牢固地共价键合在电极表面.该修饰电极对多巴胺(DA)、尿酸(UA)和抗坏血酸(AA)都具有良好的电化学催化特性.在pH=7.0磷酸缓冲溶液中,DA,UA和AA分别于0.45,0.25和0.07V(vs.Ag/AgCl)有一个良好的、独立的阳极方波伏安峰,表明此修饰电极可用于这3种物质的同时测定.与DA,UA和AA的方波伏安峰电流呈线性关系的浓度范围分别为4.0～400,2.0～500和1.0～600μmol/L,检测限(3δ)分别为1.6,1.2和0.8μmol/L.该修饰电极具有良好的灵敏度、选择性和稳定性,并具有抗污染能力.

关键词: &gamma, -氨基丁酸, 修饰电极, 方波伏安, 多巴胺, 尿酸, 抗坏血酸

Abstract: A novel monolayer γ aminobutyric acid covalently modified glassy carbon electrode has been fabricated via electrochemical oxidation procedure and was characterized with X ray photoelectron spectra(XPS) and cyclic voltammetry. The modified electrode was not only used to electrocatalyze the oxidation of dopamine(DA), uric acid(UA) and ascorbic acid(AA), but also gave rise to three well defined square wave voltammetric peaks, which can be used for simultaneous determination of these species in a mixture. The modified electrode shows good sensitivity, selectivity, stability and anti fouling effects.

Key words: Aminobutyric acid, Modified electrode, Square wave voltammetry, Dopamine, Uric acid, Ascorbic acid

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