Plant polyphenols. I. Anthocyanin production in the cultivated potato.

3. The enzyme system could be concentrated from growth media, though with some loss, by ammonium sulphate precipitation. 4. Of the substances tested, all the primary aromatic alcohols, which included fi-naphthylcarbinol, benzyl alcohol and seven other ringsubstituted benzyl alcohols, were oxidized, but three secondary I-phenylethanols were not. Glucose, ethanol, butanol and the L-amino acids tested were not oxidized. 5. Enzyme activity was little affected by pchloromercuribenzoate, cyanide or azide ions. 6. There was no evidence for pyridine nucleotide participation in the reaction.