A member of the class of flavans in which one or more ring hydrogens are replaced by hydroxy groups.
| Member | Definition | Role |
|---|
| 3,3',4'-trihydroxyflavone | | 3,3',4'-trihydroxyflavone |
| 3,7-dihydroxyflavone | | 3,7-dihydroxy-2-phenyl-1-benzopyran-4-one |
| 3,7,4'-trihydroxyflavone | | 3,4',7-Trihydroxyflavone |
| catechin | Members of the class of hydroxyflavan that have a flavan-3-ol skeleton and its substituted derivatives. | catechin |
| natsudaidain | | Natsudaidain |
| proanthocyanidin a2 | A proanthocyanidin obtained by the condensation of (-)-epicatechin units. | proanthocyanidin A2 |
| procyanidin b1 | A proanthocyanidin consisting of (-)-epicatechin and (+)-catechin units joined by a bond between positions 4 and 8' respectively in a beta-configuration.. Procyanidin B1 can be found in Cinnamomum verum (Ceylon cinnamon, in the rind, bark or cortex), in Uncaria guianensis (cat's claw, in the root), and in Vitis vinifera (common grape vine, in the leaf) or in peach. | procyanidin B1 |
| procyanidin b2 | A proanthocyanidin consisting of two molecules of (-)-epicatechin joined by a bond between positions 4 and 8' in a beta-configuration. 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, in Ecdysanthera utilis and in red wine. | procyanidin B2 |
| procyanidin b3 | A proanthocyanidin consisting of two molecules of (+)-catechin joined by a bond between positions 4 and 8' in alpha-configuration. It can be found in red wine, in barley, in beer, in peach or in Jatropha macrantha, the Huanarpo Macho. | procyanidin B3 |
| procyanidin b5 | A proanthocyanidin consisting of two molecules of (-)-epicatechin joined by a bond between positions 4 and 6' in beta-configuration. It can be found in grape seeds, in Hibiscus cannabinus (kenaf) root and bark, in apple and in cacao. | procyanidin B5 |
| procyanidin C1 | A proanthocyanidin consisting of three (-)-epicatechin units joined by two successive (4beta->8)-linkages. | procyanidin C1 |