The term flavonoïde (or bioflavonoïde ) is allotted to a class of Métabolite S secondaries gathered according to their structure Phénylbenzopyrone. The flavonoïdes are known mainly for their activity Antioxydant E.

The flavonoïdes were discovered by Albert Szent-Györgyi. They prove particularly effective to reduce the permeability of the blood-vessels.

The flavonoïdes are present in very diverse organization S. One finds them for example at the Végétaux, where they intervene in the Symbiose between the Fabacée S and the Bactérie S of the group Rhizobium.

Color

They cover a great range of color of the red to the ultra-violet while passing by the yellow. Their color depends on their structure but also on the acidity of the medium (pH), one finds also the many ones in the form of Hétéroside S. One finds some in the red of the Pomme S and the Poire S, in bays of Genièvre, the grape and the wine…

One gives to the pigments flavonoïdes the name of Anthocyane.

Chemical structure

The flavonoïdes present a basic skeleton to 15 carbon atoms, fact of two cycles in C₆ connected by a chain in C₃. The bridge with 3 carbons between two phenyls generally forms a third cycle pyrone.
On can distinguish in particular in the flavonoïdes:

• chalcones
• the flavones (yellow pigments existing in the grape films)
• the flavanones
• the flavonols
• the flavanols

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