Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/150098

Title

Fabrication of a polyglycine chemically modified electrode and its electrocatalytic oxidation to ascorbic acid

Author(s)

Yu, Ai-Min;  Zhang, Hai-Li;  Chen, Hong-Yuan

Abstract

Cyclic voltammetry was used to investigate the electrochemical polymerization of glycine at the glassy carbon electrode. The applied voltage range, pH of electrolyte, concentration of monomer, and cyclic number were found to affect the polymerization process. The resulting film displayed a catalytic activity towards the oxidation of ascorbic acid (AA), reducing the overpotential by 350 mV. A catalytic reaction rate constant of 5.86X10^4 M^-1s^-1 was determined using a rotating electrode. Hydrodynamic voltammetric experiments were performed to characterize the electrode as an amperometric sensor for the determination of AA. At 0.4V (in pH 7.0 PBS) the detection limit is 4.0X10^-8 M (S/N =3). The linear dynamic range was wide, from 6.0X10^-8 to 2.5X10^-4 M.

Publication type

Journal article

Source

Electroanalysis, Vol. 9, no. 10 (Jun 1997), pp. 788-790

Publication year

1997

FOR Code(s)

0301 Analytical Chemistry

Keyword(s)

Amperometric detection;  Ascorbic acid;  Electrocatalysis;  Polyglycine chemically modified electrode

Publisher

VCH Verlagsgesellschaft (now part of Wiley)

ISSN

1040-0397

Publisher URL

http://dx.doi.org/10.1002/elan.1140091011

Copyright

Copyright © 1997 VCH Verlagsgesellschaft mbH. The copyright policy of the publisher allows the accepted manuscript of the paper to be reproduced here after a publisher-imposed embargo period.

Peer reviewed