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An enzyme that catalyzes oxidation of benzenediols to semiquinones with O2.
References in periodicals archive ?
Screening legume forages for soluble phenols, polyphenol oxidase and extract browning.
Polyphenol oxidase activity (Mayer and Harel, 1979) E.C. Prepration Of The Sample
ValenteMesquita, "Polyphenol oxidase: Characteristics and mechanisms of browning control," Food Reviews International, vol.
Pereira, "Purification and partial characterization of polyphenol oxidase from sapodilla plum (achras sapota)," Journal of Food and Nutrition Sciences, vol.
They reported that the activity of the defense enzymes such as peroxidase (PO), polyphenol oxidase (PPO), phenyl alanine ammonia lyase (PAL) and Chitinase increased in the azoxystrobin treated cucumber plants.
Oxidation of phenols catalyzed by polyphenol oxidase and peroxidase is a potential defense mechanism in plants against herbivorous insects.
Polyphenol oxidase (PPO), a copper-dependent enzyme present in the cocoa beans, catalyzes two different reactions in the presence of oxygen, namely, the hydroxylation of monophenols to o-diphenols (monophenolase activity) and the oxidation of o-diphenols to o-quinones (diphenolase activity) [9].
That the bud and the first two leaves have all the important chemical constituents--the polyphenols (substrate), the polyphenol oxidase (enzyme), the caffeins, the amino acids, all of which are required for manufacturing a good Orthodox tea; also the inclusion of coarse leaf would detract from best development of the traditional orthodox character, is well known.
Isozyme analysis also supported our biochemical analysis by showing extra isozymes of Peroxidase (PO) Polyphenol oxidase (PPO) in resistant variety.
Polyphenol oxidase facilitates the biodegradation of lignin and other phenolic compounds, and its activity is the limiting step of the overall decomposition of litter and humus (Waldrop et al.