Catalytic Oxidation of Ascorbic Acid at a Polyhistidine Modified Electrode and Its Application to the Voltammetric Resolution of Ascorbic Acid and Dopamine
作者:
Ai-Min YU,
Deng-Ming SUN,
Hai-Ying GU,
Hong-Yuan CHEN,
期刊:
Analytical Letters
(Taylor Available online 1996)
卷期:
Volume 29,
issue 15
页码: 2633-2643
ISSN:0003-2719
年代: 1996
DOI:10.1080/00032719608002269
出版商: Taylor & Francis Group
关键词: Polyhistidine modified electrode;Ascorbic acid;Dopamine;Voltammetric resolution
数据来源: Taylor
摘要:
A new polymer (polyhistidine) modified electrode has been fabricated and was applied to the catalytic oxidation of ascorbic acid (AA), reducing the overpotential by 400 mV. The catalytic rate constant of the modified electrode for the oxidation of AA was determined using a rotating electrode. The catalytic current was linearly dependent on the ascorbic acid concentration between 5×10−5and 2×10−3M. The catalytic effect on the AA resulted in the separation of the overlapping voltammograms of AA and dopamine (DA) in a mixture. This allowed the determination of AA in the presence of DA. The electrode was rather stable even after several months; a reproducible response of AA was obtained.
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