Polyphenol oxidase | 水果好營養
![Polyphenol oxidase](https://i.imgur.com/Dp6k9gg.jpg)
Polyphenoloxidase(PPO;alsopolyphenoloxidasei,chloroplastic),anenzymeinvolvedinfruitbrowning,isatetramerthatcontainsfouratomsofcopper ...
![Polyphenol oxidase](https://i.imgur.com/Dp6k9gg.jpg)
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...
Beyond brown | 水果好營養
Novel Roles for the Polyphenol Oxidase Enzyme in ... | 水果好營養
Polyphenol Oxidase | 水果好營養
Polyphenol oxidase | 水果好營養
Polyphenol Oxidase Enzymes Cause Browning of Fruit and ... | 水果好營養
Polyphenol Oxidase(s) | 水果好營養
Polyphenol Oxidase | 水果好營養
Polyphenol Oxidases in Crops | 水果好營養
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