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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

15 Citations (Scopus)


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), koxand the maximum turnover number for glucose oxidase, ko, have been obtained. koxwas found to depend on the pH of the medium. At pH 7.0, Aoxfor o-benzoquinone and p-benzoquinone are 6.0 × 106and 4.7 × 105mol-1dm3s-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
Issue number6
Publication statusPublished - 1 Jan 1996


  • Glucose oxidase
  • Kinetics
  • Mediators
  • o-Benzoquinone

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry

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