Knowra Polyphenol Polyphenol A polyphenol is an organic compound containing multiple phenolic groups. Plants produce many polyphenols, which can contribute to pigmentation, defense, and interactions with other molecules.
Phenol : An aromatic organic compound with a hydroxyl group attached directly to a benzene ring. Polyphenols contain multiple phenolic groups built from this structural unit.
Conjugated system : A molecular arrangement in which alternating single and multiple bonds allow electrons to spread across connected atoms. Extended conjugation helps explain the visible colors of many plant polyphenols.
Wine : An alcoholic beverage made by fermenting grape juice or other fruit juice. Polyphenols from grape skins, seeds, and stems influence wine color, bitterness, and astringency.
Plant defense : The physical and chemical traits plants use to resist herbivores, pathogens, and environmental stress. Polyphenols can deter feeding or inhibit microbes as part of plant chemical defense.
Aromatic compound : A molecule containing a stable, conjugated ring system, such as a benzene ring. Many polyphenols contain aromatic rings that shape their reactivity and light absorption.
Hydrogen bond : An attraction involving a hydrogen atom bonded to an electronegative atom and another electronegative atom. Phenolic hydroxyl groups form hydrogen bonds with proteins, water, and other molecules.
Tea : An infusion made from processed leaves of Camellia sinensis. Tea catechins and their oxidation products are prominent dietary polyphenols.
Herbivory : The consumption of plant tissues by animals. Tannins and other polyphenols can affect how nutritious or palatable plant tissues are to herbivores.
Flavonoid : A large family of plant polyphenols built around a carbon framework of two aromatic rings and a connecting three-carbon unit. Flavonoids are among the most widespread and structurally diverse polyphenols.
Protein–polyphenol interaction : The association of polyphenols with proteins through noncovalent forces or, in some cases, covalent reactions. These interactions can alter protein solubility, activity, and sensory properties.
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