A novel sensitive biosensor for Ca2+ based on electropolymerized melatonin modified electrode |
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Authors: | Xiaoping Wu Wei Liu Hong Dai Guonan Chen |
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Institution: | Ministry of Education Key Laboratory of Analysis and Detection for Food Safety (Fuzhou University), and Department of Chemistry, Fuzhou University, Fuzhou, Fujian 350002, China |
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Abstract: | An electropolymerized melatonin modified glassy carbon electrode (EPMT/GCE) was prepared by electrochemically polymerizing of melatonin in a 0.04 mol l?1 perchloric acid solution. In KCl solution, Ca2+ was found to perform a reversible complex reaction on the EPMT/GCE to produce a sharp complex adsorption wave. The configuration of the electropolymerized membrane was characterized by scanning electron microscope and various electrochemical techniques. Based on which, a novel sensitive Ca2+ electrochemical sensor was established. The peak current showed a linear relationship with Ca2+ concentration in range of 6.2 × 10?7–1.0 × 10?4 mol l?1 with detection limit of 4.5 × 10?7 mol l?1. The developed electrochemical sensor has been used for determination of Ca2+ in body fluid. |
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