title: Horseradish peroxidase. XXXIV. Oxidation of compound II to I by periodate and inorganic anion radicals.
abstract: The one-electron oxidation of horseradish peroxidase compound II to compound I by sodium periodate was observed. The bimolecular rate constant for the NaIO4--compound II interaction is equal to 9.5 +/- 1 x 10(-3) M-1s-1 at room temperature. Irradiation, using ultraviolet light, of the solution containing compound II and persulfate in the presence of bicarbonate, chloride, or bromide, leads ot the fast accumulation of compound I due to the oxidative action of SO4, CO3, Cl2, and Br2 anion radicals, which are products of the photolysis.
mesh_terms: D001639:Bicarbonates / Q000528:radiation effects; D001965:Bromides / Q000528:radiation effects; D002712:Chlorides / Q000528:radiation effects; D006735:Horseradish Peroxidase / Q000528:radiation effects*; D010084:Oxidation-Reduction; D010504:Periodic Acid; D010544:Peroxidases / Q000528:radiation effects*; D010545:Peroxides / Q000528:radiation effects; D010782:Photolysis; D017670:Sodium Compounds; D013057:Spectrum Analysis; D013431:Sulfates; D013464:Sulfuric Acids / Q000528:radiation effects; D014466:Ultraviolet Rays
chemical_list: D001639:Bicarbonates; D001965:Bromides; D002712:Chlorides; D010545:Peroxides; D017670:Sodium Compounds; D013431:Sulfates; D013464:Sulfuric Acids; D010504:Periodic Acid; D006735:Horseradish Peroxidase; D010544:Peroxidases; C024625:sodium persulfate