Electrochemical Oxidation and Reduction of Flavin Mononucleotide Adsorbed on a Mercury Electrode Surface

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Abstract
The electrochemical redox reaction of flavin mononucleotide (FMN) adsorbed on a hanging mercury drop electrode was studied in a pH 6.9 phosphate buffer and a pH 4.9 acetate buffer by means of cyclic d.c. and phasese lective a.c. voltammetry. Both the oxidized and reduced forms of FMN arc strongly adsorbed on the electrode surface, and a stable adsorption layer of FMN((FMN)ad) is formed. The cyclic d.c. and a.c. voltammetric behavior of (FMN)ad is explained by equations for a two-step one-electron surface redox reaction. The formal standard redox potentials, semiquinone formation constants, and charge transfer-rate constants of the surface redox reaction of FMN at the mercury electrode were determined.