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《Chinese Journal of Analytieal Chemistry》 2001-06
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Electrochemistry and Electrocatalysis of Electropolymerized Vitamin B_1 Film Electrode

Yang Qiuxia, Ma Yurong, He Wei, Wang Xuelin (Department of Applied Chemistry, Jinan University, Jinan 250022)  
A polymer film of vitamin B1 was obtained at a graphite carbon electrode by cyclic voltammetric method in phosphate buffer solution (PBS). Cyclic voltammograms of the film electrode in PBS (pH 5) exhibited one pair redox waves, Epa = 350 mV, Epc = 325 mV, different from monomer vitamin B1. The peak currents of poly-VB1 films was proportional to (scan rate)1/2, which showed that the charge transfer was controlled by diffusion in the polymer film. The Poly-VB1 modified electrode showed a good catalytic ability to dopamine and epinephrine. At the modified electrod, the peak potential for oxidation of dopamine occurred at 250 mV and 200 mV for epinephrine, while they were shifted towards the negative direction 100 mV and 300 mV respetively at the bare glassy carbon electrode. And their peak current had a linear relationship to the concentrations in the range of 8 .0 × 10-7 - 1 .0 × 10-4 mol/L for dopamine and 1 .0 × 10-6 - 1 .0 × 10-4 mol/L for epinephrine.
【Fund】: 山东省自然科学基金
【CateGory Index】: O631
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