Polyphenol
A kind of chemical that (at least in theory) may protect against some common health problems and possibly certain effects of aging. Polyphenols act as antioxidants. They protect cells and body chemicals against damage caused by free radicals, reactive atoms that contribute to tissue damage in the body. For example, when low-density lipoprotein (LDL) cholesterol is oxidized, it can become glued to arteries and cause coronary heart disease. Polyphenols can also block the action of enzymes that cancers need for growth and they can deactivate substances that promote the growth of cancers. The polyphenol most strongly associated with cancer prevention is epigallocatechin-3-gallate, or EGCG. All tea contains polyphenols. Teas and polyphenols isolated from tea have been shown in the laboratory to act as scavengers of oxygen and nitrogen-free radicals, protecting the fatty membranes of cells, proteins and DNA. However, the results of human studies of tea and polyphenols to date (2001) have been inconsistent and have yet to prove anything one way or the other as regards the value of polyphenols.

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poly·phe·nol .päl-i-'fē-.nōl, -.nȯl, -fi-' n a polyhydroxy phenol esp an antioxidant phytochemical (as chlorogenic acid) that tends to prevent or neutralize the damaging effects of free radicals
poly·phe·no·lic -fi-'nō-lik, -'näl-ik adj

Medical dictionary. 2011.

Look at other dictionaries:

  • Polyphenol — Polyphénol Les polyphénols constituent une famille de molécules organiques largement présente dans le règne végétal. Ils sont caractérisés, comme l’indique le nom, par la présence de plusieurs groupements phénoliques associés en structures plus… …   Wikipédia en Français

  • polyphénol — ● polyphénol nom masculin Composé chimique renfermant plusieurs fonctions phénol …   Encyclopédie Universelle

  • Polyphenol — Plant derived polyphenol, tannic acid, formed by esterification of ten equivalents of the phenylpropanoid derived gallic acid to a monosaccharide (glucose) core from primary metabolism …   Wikipedia

  • Polyphenol — Quercetin, ein Polyphenol, das beispielsweise in Äpfeln und Zwiebeln enthalten ist Polyphenole sind aromatische Verbindungen, die zwei oder mehr direkt an den aromatischen Ring gebundene Hydroxylgruppen enthalten und zu den sekundären… …   Deutsch Wikipedia

  • Polyphénol — Les polyphénols constituent une famille de molécules organiques largement présente dans le règne végétal. Ils sont caractérisés, comme l’indique le nom, par la présence de plusieurs groupements phénoliques associés en structures plus ou moins… …   Wikipédia en Français

  • Polyphenol — Po|ly|phe|nol; Syn.: aromatisches Polyol: jargonhafte Sammelbez. für aromatische Verb. mit mindestens zwei ggf. substituierten Hydroxygruppen am Benzolring, z. B. Brenzcatechin, Pyrogallol, Phloroglucin, Ellagsäure, Flavonoide, Tannine u. Lignin …   Universal-Lexikon

  • polyphenol — polifenolis statusas T sritis chemija formulė Formulę žr. priede. priedas( ai) Grafinis formatas atitikmenys: angl. polyphenol rus. полифенол …   Chemijos terminų aiškinamasis žodynas

  • polyphenol — noun Etymology: International Scientific Vocabulary Date: 1894 a polyhydroxy phenol; especially an antioxidant phytochemical • polyphenolic adjective …   New Collegiate Dictionary

  • polyphenol — /pol ee fee nawl, nol/, n. Chem. a polymeric phenol. [1895 1900; POLY + PHENOL] * * * …   Universalium

  • polyphenol — noun any of a large class of organic compounds, of plant origin, having more than one phenol group; they tend to be colourful and to have antioxidant properties …   Wiktionary

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