Polyphenol oxidase | 油脂營養成分查詢網
Polyphenoloxidase(PPO;alsopolyphenoloxidasei,chloroplastic),anenzymeinvolvedinfruitbrowning,isatetramerthatcontainsfouratomsofcopper ...
Enzyme involved in fruit browning
Polyphenol oxidase (PPO; also polyphenol oxidase i, chloroplastic), an enzyme involved in fruit browning, is a tetramer that contains four atoms of copper per molecule.[1]
PPO may accept monophenols and/or o-diphenols as substrates.[2] The enzyme works by catalyzing the o-hydroxylation of monophenol molecules in which the benzene ring contains a single hydroxyl substituent to o-diphenols (phenol molecules containing two hydroxyl substituents at the 1, 2 positions, with no carbon between).[3] It can also further catalyse the oxidation of o-diphenols to produce o-quinones.[4] PPO catalyses the rapid polymerization of o-quinones to produce black, brown or red pigments (polyphenols) that cause fruit browning.
The amino acid tyrosine contains a single phenolic ring that may be oxidised by the action of PPOs to form o-quinone. Hence, P...
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Polyphenol oxidase | 油脂營養成分查詢網
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