Proanthocyanidin B1
Encyclopedia
Proanthocyanidin B1 is a B type proanthocyanidin
B type proanthocyanidin
B type proanthocyanidins are a specific type of proanthocyanidin, which are a class of flavanoids. They are oligomers of flavan-3-ols.-Dimeric B type proanthoanthocyanidins :...

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It is a molecule with a 4→8 bond (epicatechin-(4β→8)-catechin
Catechin
Catechin is a natural phenol antioxidant plant secondary metabolite. The term catechins is also commonly used to refer to the related family of flavonoids and the subgroup flavan-3-ols ....

). Proanthocyanidin-B1 can be found in Cinnamomum verum
Cinnamomum verum
Cinnamomum verum, called "true cinnamon", Ceylon cinnamon or Sri Lanka cinnamon is a small evergreen tree belonging to the family Lauraceae, native to Sri Lanka...

(Ceylon cinnamon, in the rind, bark or cortex), in Uncaria guianensis
Uncaria guianensis
Uncaria guianensis, the cat's claw, is a plant species in the genus Uncaria found in Guyana. Other names for the plant include Garabato, Garabato Amarillo, Garabato Colorado, Hawk's Claw, Life-giving vine of Peru, Paraguayo, Samento, Saventaro, Tambor huasca, Una de Gato, and Una de Gavilan.U...

(Cat's claw, in the root), and in Vitis vinifera
Vitis vinifera
Vitis vinifera is a species of Vitis, native to the Mediterranean region, central Europe, and southwestern Asia, from Morocco and Portugal north to southern Germany and east to northern Iran....

(Common grape vine, in the leaf).
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