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Flavonoid

Den kemiske struktur af flavonoiedet Isoflavan

Flavoner eller Flavonoider er en gruppe kemiske stoffer, som findes naturligt i frugter, grøntsager, teer, vine, nødder, frø, og rødder. Det er polyfenoliske stoffer med 15 kulstofatomer, som sidder i 2 benzenringe, der forbindes af en række med tre kulstofatomer:

C6 – C3 – C6 systemet

De betragtes ikke som egentlige vitaminer, men flavonoider har en række vigtige, ernæringsmæssige virkninger. Man har beskrevet denne evne som ”modificering af biologiske reaktioner”. De fleste virker som antioxidanter og en del har egenskaber, der kan bekæmpe betændelsestilstande.


Flavonoider inddeles ofte I 5 (eller 6) undergrupper:

  • Flavanoner: F.eks. Hesperetin, Naringenin, Eriodictyol
  • Flavan-3-ols: Catechin, Gallocatechin, Epicatechin, Epigallocatechin, Epicatechin 3-gallat, Epigallocatechin 3-gallat, Theaflavin, Theaflavin 3-gallat, Theaflavin 3'-gallat, Theaflavin 3,3' digallat, Thearubiginer
  • Antocyanidiner: Antocyanidin er lange forbindelser, som består af glykosidiske antocyaniner. Næst efter klorofyl er antocyaniner den vigtigste gruppe af plantefarvestoffer, som kan ses af det menneskelige øje.
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Flavonoid
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