Electrocatalytic oxidation and determination of ascorbic acid at poly(glutamic acid) chemically modified electrode

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/150046

Title: Electrocatalytic oxidation and determination of ascorbic acid at poly(glutamic acid) chemically modified electrode
Author(s): Yu, Ai-Min; Chen, Hong-Yuan
Abstract: Cyclic voltammetry was used to investigate the electrochemical behavior of ascorbic acid (AA) at the poly(glutamic acid) chemically modified electrode (PME) in phosphate buffer solution. A decrease of 400 mV in overpotential was obtained. The number of electrons involved in the reaction (two electrons) and the catalytic rate constant (1.2 x 10^4 M^-1 s^-1) were determined using a rotating electrode. Hydrodynamic voltammetric experiments were performed to characterize the electrode as an amperometric sensor for the determination of AA. At 0.3 V, in pH 5.0 PBS, the detection limit was 4.0 x 10^-8 M when S/N=3. The catalytic effect on the catalytic oxidation of AA resulted in the separation of the overlapping voltammograms of AA and dopamine at the glassy carbon electrode in a mixture.
Publication type: Journal article
Source: Analytica Chimica Acta, Vol. 344, no. 3 (Jun 1997), pp. 181-185
Publication year: 1997
FOR Code(s): 0301 Analytical Chemistry
Keyword(s): Amperometric detection; Ascorbic acid; Assay; Chemically modified electrode; Cyclic potentiometry; Drug determination; Electrocatalysis; Electrochemistry; Polyglutamic acid; Sensor
Publisher: Elsevier
ISSN: 0003-2670
Publisher URL: http://dx.doi.org/10.1016/s0003-2670(97)00016-0
Peer reviewed