Catalytic oxidation of ascorbic acid at a polyhistidine modified electrode and its application to the voltammetric resolution of ascorbic acid and dopamine

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Title: Catalytic oxidation of ascorbic acid at a polyhistidine modified electrode and its application to the voltammetric resolution of ascorbic acid and dopamine
Author(s): Yu, Ai-Min; Sun, Deng-Ming; Gu, Hai-Ying; Chen, Hong-Yuan
Abstract: 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 x 10^-5 and 2 x 10^-3 M. 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.
Publication type: Journal article
Source: Analytical Letters, Vol. 29, no. 15 (Dec 1996), pp. 2633-2643
Publication year: 1996
FOR Code(s): 0301 Analytical Chemistry
Keyword(s): Ascorbic acid; Dopamine; Polyhistidine modified electrode; Voltammetric resolution
Publisher: Marcel Dekker (now an imprint of Taylor & Francis)
ISSN: 0003-2719
Publisher URL: http://dx.doi.org/10.1080/00032719608002269
Peer reviewed