Poly (3-(3-Pyridyl) Acrylic Acid) Modified Glassy Carbon Electrode for Simultaneous Determination of Dopamine, Ascorbic Acid and Uric Acid

Annali di chimica Pub Date : 2007-07-02 DOI:10.1002/adic.200790051

Yuzhong Zhang, Shao Su, Yan Pan, Liping Zhang, Yuejuan Cai

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引用次数: 16

Abstract

Trans-3-(3-pyridyl) acrylic acid (PAA) was deposited on glassy carbon electrode (GCE) by electropolymerization in pH 7.0 phosphate buffer solution (PBS). The poly (3-(3-pyridyl) acrylic acid) (PPAA) film modified glassy carbon electrode shows an excellent electrochemical response for dopamine (DA), ascorbic acid (AA) and uric acid (UA). The cyclic voltammetry oxidation peaks for DA and AA, DA and UA, AA and UA are separated by 150 mV, 130 mV and 280 mV, respectively. This permits the simultaneous determination of AA, DA and UA. The interference of AA with the determination of DA could be eliminated because of the electrostatic interaction between DA cations and the negatively charged PPAA film at pH 7.0. The anodic peak currents of DA, AA and UA increase linearly with concentration in the range of 1-40 μmol L^-1, 10-400 μmol L^-1 and 1.6-80 μmol L^-1, respectively, with a correlation coefficient (r) always higher than 0.998. The detection limit is 0.06 μmol L^-1, 0.8 μmol L^-1 and 1.1 μmol L^-1 for DA, AA and UA, respectively.

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聚(3-(3-吡啶基)丙烯酸修饰玻碳电极同时测定多巴胺、抗坏血酸和尿酸

在pH 7.0的磷酸盐缓冲溶液(PBS)中，通过电聚合将反式3-(3-吡啶基)丙烯酸(PAA)沉积在玻碳电极(GCE)上。聚(3-(3-吡啶基)丙烯酸(PPAA)薄膜修饰的玻碳电极对多巴胺(DA)、抗坏血酸(AA)和尿酸(UA)表现出优异的电化学响应。DA和AA、DA和UA、AA和UA的循环伏安氧化峰分别相隔150 mV、130 mV和280 mV。这样可以同时测定AA、DA和UA。在pH 7.0时，由于DA阳离子与带负电荷的PPAA膜之间存在静电相互作用，可以消除AA对DA测定的干扰。DA、AA和UA的阳极峰电流分别在1 ~ 40 μmol L-1、10 ~ 400 μmol L-1和1.6 ~ 80 μmol L-1范围内随浓度呈线性增加，相关系数(r)均大于0.998。DA、AA和UA的检出限分别为0.06 μmol L-1、0.8 μmol L-1和1.1 μmol L-1。

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Annali di chimica

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