Procyanidin B2
Introduction '''Procyanidin B2''' is a B type proanthocyanidin. Its structure is (−)-Epicatechin-(4β→8)-(−)-epicatechin.Procyanidin B2 can be found in ''Cinchona pubescens'' (Chinchona: in the rind, bark, and cortex), in ''Cinnamomum verum'' (Ceylon cinnamon: in the rind, bark, and cortex), in ''Crataegus monogyna'' (Common hawthorn: in the flower and blossom), in ''Uncaria guianensis'' (Cat's claw: in the root), in ''Vitis vinifera'' (Common grape vine: in the leaf), in ''Litchi chinensis'' (litchi: in the pericarp), in the apple, and in ''Ecdysanthera utilis''.Procyanidin B2 can be converted into procyanidin A2 by radical oxidation using 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals under neutral conditions.Procyanidin B2 has been shown to inhibit the formation of the advanced glycation end-products pentosidine, carboxymethyllysine (CML), and methylglyoxal (MGO).
See also * Phenolic content in wine
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