polyphenoloxidase


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polyphenoloxidase

(pŏl″ē-fē″nŏl-ŏk′sĭ-dās)
An enzyme present in bacteria, fungi, and some plants that catalyzes the oxidation of polyphenols, but not monophenols such as tyrosine, to quinones.
References in periodicals archive ?
monophenol monooxygenase, polyphenoloxidase, catechol oxidase, and oxidoreductase), a copper-containing enzyme that induces formation of catecholamine quinone derivatives by its oxidase activity, makes a point since it has been demonstrated to cause a neuronal toxicity through oxidation of cytosolic excess dopamine in PD [9].
Billaud CS, Brun-Merimee S, Louarme L, Jacques N (2004) Effect of glutathione and Maillard reaction products prepared from glucose or fructose with glutathione on polyphenoloxidase from apple-I: Enzymatic browning and enzyme activity inhibition.
The enzymatic browning reaction occurs due to presence of the polyphenoloxidase enzyme (PPO) that catalyzes the oxidation reaction of phenolic compounds (Eissa, Fadel, Ibrahim, Hassan, & Elrashid 2006; Oliveira, Soares, Paula, & Viana 2008).
The surface color, pH, activity of phenylalanine ammonia-lyase, peroxidase and polyphenoloxidase enzymes, chlorophyll and carotenoids contents were evaluated.
The polyphenoloxidase activity was determined as per the procedure given by Mayer et al.
Copper enzyme in isolated chloroplasts polyphenoloxidase in Beta vulgaris, Plant Physiol.
Gu Y, Wang P, Kong CH (2009) Urease, invertase, dehydrogenase and polyphenoloxidase activities in paddy soil influenced by allelopathic rice variety.
Mishra, "Catalase, peroxidase, and polyphenoloxidase activities during rice leaf senescence," Plant Physiology, vol.
Polyphenoloxidase activity browning potential and phenolic content of peaches during postharvest ripening.
Effects of desiccation on the lipid peroxidation and activities of peroxidase and polyphenoloxidase in seeds of Telfairia occidentalis.