związki organiczne, które naturalnie występują w roślinach. W roślinach są produkowane w odpowiedzi na stres, mają działanie ochronne przed grzybami i bakteriami, a także przed promieniowaniem ultrafioletowym. Rośliny, w których występują polifenole mają gorzki smak. Do polifenoli należą między innymi flawonoidy.
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