Abstract
The reaction of thiocyanate and hydrogen peroxide is catalyzed by lactoperoxidase (donor: H 2O 2 oxidoreductase, EC 1.11.1.7). The initial products are cyanide and sulfate ions. Cyanide rapidly disappears from the incubation mixture. The oxidation of cyanide by hydrogen peroxide is not catalyzed by lactoperoxidase at pH 5.7, but intermediary compounds produced in the course of the oxidation of thiocyanate react with cyanide. Cyanate, and presumably sulfur dicyanide, are formed. The latter is oxidized by the hydrogen peroxide-lactoperoxidase system to sulfate and cyanide; cyanate is spontaneously hydrolyzed to ammonia. The lactoperoxidase-catalyzed reaction of thiocyanate with hydrogen peroxide resembles the acid-catalyzed rather than the pH-independent reaction.
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