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Flavonoids (or bioflavonoids) (from the Latin word ''flavus'' meaning yellow, their color in nature) are a class of plant secondary metabolites. Chemically, they have the general structure of a 15-carbon skeleton, which consists of two phenyl rings (A and B) and heterocyclic ring (C). This carbon structure can be abbreviated C6-C3-C6. According to the IUPAC nomenclature,〔 〕〔 〕 they can be classified into: *''flavonoids'' or ''bioflavonoids'' *''isoflavonoids'', derived from 3-phenylchromen-4-one (3-phenyl-1,4-benzopyrone) structure *''neoflavonoids'', derived from 4-phenylcoumarine (4-phenyl-1,2-benzopyrone) structure The three flavonoid classes above are all ketone-containing compounds, and as such, are anthoxanthins (flavones and flavonols). This class was the first to be termed ''bioflavonoids''. The terms ''flavonoid'' and ''bioflavonoid'' have also been more loosely used to describe non-ketone polyhydroxy polyphenol compounds which are more specifically termed flavanoids. The three cycle or heterocycles in the flavonoid backbone are generally called ring A, B and C. Ring A usually shows a phloroglucinol substitution pattern. == Biosynthesis == (詳細はウィキペディア（Wikipedia）』 ■ウィキペディアで「Flavonoid」の詳細全文を読む スポンサード リンク
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