[Kinetics and mechanism of action of horseradish peroxidase in the reaction of dioxyfumaric acid oxidation with atmospheric oxygen].

Quantitative kinetic data are given on the oxidation reaction of dioxyfumaric acid (DFA) with atmospheric oxygen in the presence of horseradish peroxidase (HRP) depending on pH. Activation constants of oxidation with hydrogen peroxide and Mn ions are determined at pH 3.0. Autocatalytic character of FRA oxidation is shown to be due to the formation of H2O2 and other hydro peroxide-type compounds in the reaction, HRP convertions in the DFA--O2 system are studied using spectrophotometry. A mechanism of the initiation of free radicals in HRP--DFA--O2 system is proposed.