The direct, unmediated electrochemistry of horseradish peroxidase (HRP) has been studied using a tin doped indium oxide coated glass working electrode at ambient pH. A well defined quasi-reversible cyclic voltammogram was obtained at high positive potentials corresponding to an E1/2 of +700 mV s. NHE. The cyanide complex of HRP also showed similar values of E1/2, indicating formation of a pophyrin centred cation radical upon oxidation of the enzyme.
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Chattopadhyay et al. (1999) studied this question.
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