Electrocatalytic oxidation and determination of dopamine at a carbon ionic liquid electrode modified with nafion-L-aspar

The electrocatalytic oxidation of dopamine (DA) was studied by electrochemical approaches at a carbon ionic liquid electrode (CILE) modified with the composite film of nafion and L-aspartic acid (NL-CILE). The CILE was fabricated by replacing non-conductive organic binders with a room-temperature hydrophobic ionic liquid, 1-butyl-3-methyl-imidazolium hexafluorophosphate. The composite film of NL was used as matrix to adsorb DA and catalyze the oxidation of DA in phosphate buffer solution (PBS). The electrochemical response of DA was investigated at the NL-CILE, the traditional carbon paste electrode (TCPE), CILE and the nafion modified CILE (N-CILE) in 0.1?M PBS (pH 7.4), respectively. The results showed the superiority of NL-CILE to N-CILE, CILE and TCPE in terms of provision of higher sensitivity, faster electron transfer and better reversibility. Under optimum condition, the oxidation peak current was rectilinear with DA concentration range from 0.1?μM to 0.1?mM, with a detection limit of 0.03?μM (S/N=3) by differential pulse voltammetry. The proposed method was applied to determine DA in samples successfully.

作 者： Xiao-Dong Shangguan Jian-Bin Zheng Qing-Lin Sheng Ya-Ping He   作者單位： Institute of Analytical Science, Shaanxi Provincial Key Laboratory of Electroanalytical Chemistry, Northwest University, Xi'an 710069, China  刊 名： 西安交通大學(xué)學(xué)報(bào)（英文版）  英文刊名： ACADEMIC JOURNAL OF XI'AN JIAOTONG UNIVERSITY(ENGLISH EDITION)  年，卷(期)： 2010 22(1)  分類號(hào)： U4  關(guān)鍵詞： voltammetry   Ionic liquid   nafion   L-aspartic acid   dopamine  

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