Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 580, Issue 1, Pages 35-40Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2005.02.022
Keywords
bioelectrocatalysis; versatile peroxidase; heterogeneous electron transfer; graphite electrode
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Electron transfer (ET) of versatile peroxidase (VP) was studied in the bioelectrocatalytic reduction reaction of H2O2 at peroxidase-modified graphite electrodes to obtain additional information on the kinetic characteristics of this novel ligninolytic peroxidase. Rotating disk electrode; (RDE) experiments were performed at 0 V (vs. SCE) in two different buffers (tartrate buffer, pH 5.0; and citrate buffer, pH 3.0). From measurements of the mediated and mediatorless currents of H2O2, reduction at the RDE, the percentage of VP molecules involved in direct ET ( approximate to 55%) was calculated. The peroxidase-modified electrodes were used for determination of the donor substrates in RDE mode, and the results were interpreted in terms of catalytic efficiencies. (c) 2005 Elsevier B.V. All rights reserved.
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