A flavonoid oligomer obtained by the the condensation of two or more units of hydroxyflavans.
| Member | Definition | Role |
|---|
| cinnamtannin a2 | A proanthocyanidin isolated from Cinnamomum cassia. | cinnamtannin A2 |
| cinnamtannin b-1 | A proanthocyanidin found in Cinnamomum cassia and Cinnamomum zeylanicum. | cinnamtannin B-1 |
| proanthocyanidin a2 | A proanthocyanidin obtained by the condensation of (-)-epicatechin units. | proanthocyanidin A2 |
| procyanidin | | procyanidin |
| 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 |
| theasinensin a | A biflavonoid that is obtained by coupling of two molecules of (-)-epigallocatechin 3-gallate resulting in a bond between positions C-2 of the hydroxyphenyl ring. It is a natural product found in oolong tea. | theasinensin A |