Square Wave Voltammetry for Selective Detection of Dopamine Using Polyglycine Modified Carbon Ionic Liquid Electrode |
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| Authors: | Yonghong Li Xinsheng Liu Wanzhi Wei |
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| Institution: | 1. State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Hunan, Changsha 410082, P.?R. China tel: +86‐731‐88821960;2. fax: +86‐731‐88821967;3. Hunan Nonferrous Xiangxiang Fluoride Chemical Co. Ltd., Hunan, Xiangxiang 411400, P.?R. China |
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| Abstract: | The electrochemical polymerization of glycine on carbon ionic liquid electrode (CILE) was described. The presence of ionic liquid on the surface of CILE facilitated the electropolymerization of glycine. The polyglycine modified CILE provided a valid and simple approach to selectively detect dopamine in the presence of AA in physiological environment. The proposed sensor not only decreased the voltammetric responses of AA but also dramatically enhanced the oxidation peak current of DA compared to bare CILE. Using square wave voltammetry, the modified CILE showed good electrochemical behavior to DA, a linear range of 1.0×10?7–3.0×10?4 M in the presence of 1 mM ascorbic acid (AA) and a detection limit of 5.0×10?9 M was estimated (S/N=3). |
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| Keywords: | Carbon ionic liquid electrode Electropolymerization Glycine Square wave voltammetry Dopamine |
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