The action of inhibitors on the catechol oxidase of potatoes

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Abstract
Catechol oxidase preparations from Synnga vulgaris, Sambucus nigra, Agaricus campestris. Polyporus hispidus, Tenebrio molitor, and potato, compared by measuring the extent to which they were inhibited by varying conc. of resorcinol, showed marked specific differences in behavior. The rate of oxidation of p-cresol by the catechol oxidase of potatoes was strongly accelerated by substances which produce o-quinones, and strongly inhibited by substances which combine with o-quinones. The reaction would therefore appear to be essentially a secondary oxidation in which the formation of an o-quinone is involved, rather than a direct oxidation of p-cresol by the enzyme. Conditions were found under which the catechol oxidase system of potatoes effected the secondary oxidation of o-phenylene-diamine and of thiolacetic acid.

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