Voltammetric Behavior of Dopamine at dsDNA-modified Ni2+/poly(o-aminophenol) Carbon Paste Electrode

Chem. J. Chinese Universities

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Voltammetric Behavior of Dopamine at dsDNA-modified Ni²⁺/poly(o-aminophenol) Carbon Paste Electrode

YANG Tao^1,2, JIAO Kui¹, YANG Jie¹, ZHAO Chang-Zhi¹, QU Wen-Ying¹

1. College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China;
2. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266003, China

Received:2006-01-26 Revised:1900-01-01 Online:2006-12-10 Published:2006-12-10
Contact: JIAO Kui

Abstract

Abstract: The Ni²⁺/poly(o-aminophenol) electropolymerization was carried out by a continuous cyclic voltammetric scanning at a carbon paste electrode in a mixture of 0.02 mol/L o-aminophenol, 0.3 mol/L NiSO₄ and 0.6 mol/L HClO₄. dsDNA was linked to the conducting polymer via three-dimensional structure of polymer film and electrostatic attraction between the negatively charged phosphate backbone of DNA and Ni²⁺ ion. The results were testified by the electrochemical methods by using Co(phen)²⁺₃ as an electrochemical indicator. The currents of redox peaks of Co(phen)²⁺₃ increased after immobilizing dsDNA. The conditions for the preparation of Ni²⁺/P-OAP/CPE and DNA immobilization were optimized. The voltammetric behavior of dopamine was investigated at the modified electrode. It was found that the modified electrode exhibited a highly electrocatalytic activity toward dopamine oxidation. Differential pulse voltammetry was used for determination of dopamine in pH 5.1 phosphate buffer solution. A linear response of the peak current versus the concentration was found in the range from 5.0×10^-6 to 2.0×10^-4mol/L with 1.0×10^-2 mol/L AA(ascorbic acid) coexisting. The presence of a high concentration of AA did not interfere with the determination. The proposed method exhibits a good recovery and reproducibility.

Key words: o-Aminophenol, Ni²⁺, DNA, Dopamine, Ascobic acid

CLC Number:

O657.1

TrendMD:

YANG Tao^1,2, JIAO Kui¹, YANG Jie¹, ZHAO Chang-Zhi¹, QU Wen-Ying¹. Voltammetric Behavior of Dopamine at dsDNA-modified Ni²⁺/poly(o-aminophenol) Carbon Paste Electrode[J]. Chem. J. Chinese Universities, doi: .

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Voltammetric Behavior of Dopamine at dsDNA-modified Ni²⁺/poly(o-aminophenol) Carbon Paste Electrode

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