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 ?
Hambaba, Effect of pH, Temperature and Some Chemicals on Polyphenoloxidase and Peroxidase Activities in Harvested Deglet Nour and Ghars Dates, doi.org/10.1016/j.postharvbio.2015.07.027, Postharvest Biol.
Catalase, peroxidase and polyphenoloxidase activities during rice leaf senescence.
Nkang A, Omokaro D, Egbe A (2000) Effects of desiccation on the lipid peroxidation and activities of peroxidase and polyphenoloxidase in seeds of Telfairia occidentalis.
The modification of flesh color is due to the damages caused in the cells by toxic intermediary products that accumulate during cold storage and to the oxidation of phenolic compounds by the polyphenoloxidase enzyme (Macheix, Fleuriet, & Billot 1990; Espin, Morales, Varon, Tudela, & Garcia, 1997).
It is due to the production of brown-colored polymers (melanoidins) from enzyme catalyzed reactions, such as peroxidase and polyphenoloxidase (TOMASBARBERAN; SPIN, 2001; VILAS-BOAS, 2002).
Polyphenoloxidase Silencing Affects Latex Coagulation in Taraxacum Species.
Isolation, purification and physicochemical characterization of polyphenoloxidase (PPO) from a dwarf variety of banana (Musa cavendishii, L).
The first one involves the enzymatic browning reaction; the enzymes responsible for browning, especially peroxidase and polyphenoloxidase, in contact with oxygen, cause the oxidation of phenolic compounds.
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].
Dri, "Polyphenoloxidase inactivation by light exposure in model systems and apple derivatives," Innovative Food Science & Emerging Technologies, vol.