Enhanced electrochemical response in oxidative differential pulse voltammetry of dopamine in the presence of ascorbic acid at carboxyl-terminated boron-doped diamond electrodes
作者： Takeshi Kondo , Yu Niwano , Akira Tamura , Junichi Imai , Kensuke Honda
DOI: 10.1016/J.ELECTACTA.2008.10.073
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摘要: Abstract The differential pulse voltammetric (DPV) peak for dopamine (DA) oxidation was found to be highly amplified by the addition of ascorbic acid (AA) when carboxyl-terminated boron-doped diamond (BDD) electrodes were used as working electrode. DP voltammogram a solution containing DA and AA obtained using 4-pentenoic acid-modified BDD (4PA-BDD) electrode showed well-separated peaks at 0.4 0.6 V vs. Ag/AgCl, respectively. In addition, concentration increased constant concentration, simultaneous increase in current density decrease observed. slope calibration curve [DA] range 1–10 μM presence (500 μM) seven times larger than that absence AA. Such an enhancement more efficient 4PA-BDD oxidized-BDD, partly due simple electrostatic effects suppression polymerization products terminal carboxyl groups. enhanced detection method should effective analytical tool, especially determining low concentrations high
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