phenolase

enzyme

Written by

The Information Architects of Encyclopaedia Britannica

Last updated

July 23, 2026

Quick Summary

Phenolase, also known as polyphenol oxidase or polyphenolase, is a type of enzyme that contains copper. These enzymes are responsible for catalyzing the oxidation of diphenols and polyphenols into quinones. Phenols themselves are organic compounds characterized by a hydroxyl group attached to a carbon atom within an aromatic ring. They can exist as liquids or solids and are often toxic or caustic. Phenols have various applications, including use as disinfectants, in the synthesis of plastics, explosives, and drugs like aspirin.123

Summary created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

4 Britannica Sources

Ask Britannica AI about this topic

Britannica doesn't have a full article on this topic, so we've curated a list of our relevant coverage.

food additive
Antioxidants
For example, enzymes called phenolases catalyze the oxidation of certain molecules (e.g., the amino acid tyrosine) when fruits and vegetables, such as apples, bananas, and potatoes, are cut or bruised. The product of these oxidation reactions, collectively known as enzymatic browning, is a dark pigment
Read More
For example, enzymes called phenolases catalyze the oxidation of certain molecules (e.g., the amino acid tyrosine) when fruits and vegetables, such as apples, bananas, and potatoes, are cut or bruised. The product of these oxidation reactions, collectively known as enzymatic browning, is a dark pigment
Read More