Polyphenoloxidase

Phenolase, more chloroplastic polyphenol oxidase ( PPO), formerly catechol oxidase, is called the homologue of tyrosinase in plants. In addition to the reactions of the tyrosinase is able to oxidize, phenols and catechols. These reactions are responsible for the browning of plant material after injury and exposure to air oxygen. The resulting quinones are toxic to pathogenic microorganisms.

Enzymatic catalysis

In the oxidation of catechol in the presence of a catalyst phenolase the dihydroxybenzene in benzoquinone is converted to:

Digital Object Identifier
169386
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