Kinetics of o-Benzoquinone Mediated Oxidation of Glucose by Glucose Oxidase at Edge Plane Pyrolytic Graphite Electrode

Tit Wah Hui, Kwok Yin Wong*, Kwok Keung SHIU

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

15 Citations (Scopus)

Abstract

The kinetic constants for the electrocatalytic oxidation of β-D-glucose by glucose oxidase in the presence of o- and p-benzoquinone as electron mediators have been evaluated by cyclic voltammetry in pH 6-8. The rate constants for the reductive half-reaction (reduction of glucose oxidase by β-D-glucose), kred, the oxidative half-reaction (oxidation of glucose oxidase by the mediator), kox and the maximum turnover number for glucose oxidase, ko, have been obtained. kox was found to depend on the pH of the medium. At pH 7.0, Aox for o-benzoquinone and p-benzoquinone are 6.0 × 106 and 4.7 × 105 mol-1 dm3 s-1, respectively. o-Benzoquinone appears to be a more effective electron transfer mediator than p-benzoquinone.

Original languageEnglish
Pages (from-to)597-601
Number of pages5
JournalElectroanalysis
Volume8
Issue number6
DOIs
Publication statusPublished - Jun 1996

Scopus Subject Areas

  • Analytical Chemistry
  • Electrochemistry

User-Defined Keywords

  • Glucose oxidase
  • Kinetics
  • Mediators
  • o-Benzoquinone

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