Abstract
A composite material, which includes glucose oxidase (GOD), finely divided colloidal graphite, ferrocene, and Nafion, is developed and investigated. Kinetic parameters of redox conversions of GOD and flavin adenine dinucleotide, which is present in the active center of GOD, indicate that GOD in the composite retains molecular integrity and enzymic activity. Ferrocene in the composite undergoes reversible oxidation and is reduced on the electrode. Bioelectrocatalytic oxidation of glucose on the composite occurs via a mediator path, and the half-wave potential of a polarization curve recorded on the electrode in the presence of glucose coincides with the redox potential of ferrocene, which is equal to 0.32 V (Ag/AgCl). Effect of the ferrocene amount in the composite and the glucose concentration in the bulk solution on the glucose oxidation is studied. The results are used to optimize the composite's composition to ensure a stable operation of the enzyme electrode and effective glucose oxidation.
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Kapustin, A.V., Bogdanovskaya, V.A. & Tarasevich, M.R. Mediated Bioelectrocatalytic Oxidation of Glucose on a Glucose Oxidase-Containing Composite. Russian Journal of Electrochemistry 39, 808–813 (2003). https://doi.org/10.1023/A:1024846623454
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DOI: https://doi.org/10.1023/A:1024846623454