Procyanidin B1 is a procyanidin dimer. It is a molecule with a 4→8 bond (

epicatechin Catechin is a flavan-3-ol, a type of secondary metabolite providing antioxidant roles in plants. It belongs to the subgroup of polyphenols called flavonoids. The name of the catechin chemical family derives from ''catechu'', which is the tanni ...

-(4β→8)-

catechin Catechin is a flavan-3-ol, a type of secondary metabolite providing antioxidant roles in plants. It belongs to the subgroup of polyphenols called flavonoids. The name of the catechin chemical family derives from ''catechu'', which is the tanni ...

). Proanthocyanidin-B1 can be found in ''

Cinnamomum verum ''Cinnamomum verum'', called true cinnamon tree or Ceylon cinnamon tree, is a small evergreen tree belonging to the family Lauraceae, native to Sri Lanka. The inner bark of several other '' Cinnamomum'' species are also used to make cinnamon, but ...

'' (Ceylon cinnamon, in the rind, bark or cortex), in ''

Uncaria guianensis ''Uncaria guianensis'', the cat's claw, is a plant species in the genus ''Uncaria'' found in the Amazon biome. Other names for the plant include ''uña de gato'', ''Paraguayo'' and ''vincaria''. ''Uncaria guianensis'' contains many phytochemica ...

'' (cat's claw, in the root), and in ''

Vitis vinifera ''Vitis vinifera'', the common grape vine, is a species of flowering plant, native to the Mediterranean region, Central Europe, and southwestern Asia, from Morocco and Portugal north to southern Germany and east to northern Iran. There are curr ...

'' (common grape vine, in the leaf) or in

peach The peach (''Prunus persica'') is a deciduous tree first domesticated and cultivated in Zhejiang province of Eastern China. It bears edible juicy fruits with various characteristics, most called peaches and others (the glossy-skinned, non-f ...

. Procyanidin B1 can be converted into

procyanidin A1 Procyanidin A1 is an A type proanthocyanidin dimer. It is an epicatechin-(2β→7,4β→8)-catechin dimer found in '' Rhododendron spiciferum'', in peanut skins and in ''Ecdysanthera utilis''. Procyanidin B1 can be converted into procyanidin A1 ...

by radical oxidation using 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals under neutral conditions.Conversion of procyanidin B-type (catechin dimer) to A-type: evidence for abstraction of C-2 hydrogen in catechin during radical oxidation. Kazunari Kondo, Masaaki Kurihara, Kiyoshi Fukuhara, Takashi Tanaka, Takashi Suzuki, Naoki Miyata and Masatake Toyoda, Tetrahedron Letters, 22 January 2000, Volume 41, Issue 4, Pages 485–488,

References

Procyanidin dimers {{Aromatic-stub

See also

References