Procyanidin B2

Procyanidin B2
	Chemical structure of procyanidin B2
Names
	IUPAC name [(2R,3R,4R)-Flavan-3,3′,4′,5,7-pentol]-(4→8)-[(2R,3R)-flavan-3,3′,4′,5,7-pentol]
	Systematic IUPAC name (2R,2′R,3R,3′R,4R)-2,2′-Bis(3,4-dihydroxyphenyl)-3,3′,4,4′-tetrahydro-2H,2′H-[4,8′-bi-1-benzopyran]-3,3′,5,5′,7,7′-hexol
	Other names Procyanidin-B2; (−)-Epicatechin-(4β→8)-(−)-epicatechin
Identifiers
CAS Number	29106-49-8 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:75632;
ChemSpider	109417;
PubChem CID	122738;
UNII	L88HKE854X ;
CompTox Dashboard (EPA)	DTXSID701028797 ;
	InChI InChI=1S/C30H26O12/c31-13-7-20(37)24-23(8-13)41-29(12-2-4-16(33)19(36)6-12)27(40)26(24)25-21(38)10-17(34)14-9-22(39)28(42-30(14)25)11-1-3-15(32)18(35)5-11/h1-8,10,22,26-29,31-40H,9H2/t22-,26-,27-,28-,29-/m1/s1 Key: XFZJEEAOWLFHDH-NFJBMHMQSA-N;
	SMILES O[C@@H]1Cc2c(O)cc(O)c([C@@H]3[C@@H](O)[C@H](Oc4cc(O)cc(O)c34)c3ccc(O)c(O)c3)c2O[C@@H]1c1ccc(O)c(O)c1;
Properties
Chemical formula	C30H26O12
Molar mass	578.52 g/mol
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

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),^[1] in Litchi chinensis (litchi: in the pericarp),^[2] in the apple,^[3] and in Ecdysanthera utilis.^[4]

Procyanidin B2 can be converted into procyanidin A2 by radical oxidation using 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals under neutral conditions.^[5]

Procyanidin B2 has been shown to inhibit the formation of the advanced glycation end-products pentosidine, carboxymethyllysine (CML), and methylglyoxal (MGO).^[6]

References

^ Proanthocyanidin-B2 on liberherbarum.com
^ Immunomodulatory and anticancer activities of flavonoids extracted from litchi (Litchi chinensis Sonn.) pericarp. Mouming Zhao; Bao Yang; Jinshui Wang; Yang Liu; Limei Yu; Yueming Jiang, 2007
^ Proanthocyanidin-B2 on fuzing.com
^ Lin LC (2002). "Immunomodulatory Proanthocyanidins from Ecdysanthera u tilis". Journal of Natural Products. 65 (4): 505–508. doi:10.1021/np010414l. PMID 11975489.
^ Kondo K (2000). "Conversion of procyanidin B-type (catechin dimer) to A-type: evidence for abstraction of C-2 hydrogen in catechin during radical oxidation". Tetrahedron Letters. 41 (4): 485–488. doi:10.1016/S0040-4039(99)02097-3.
^ Peng X, Ma J, Chao J, Sun Z, Chang RC, Tse I, Li ET, Chen F, Wang M (2010). "Beneficial effects of cinnamon proanthocyanidins on the formation of specific advanced glycation endproducts and methylglyoxal-induced impairment on glucose consumption". Journal of Agricultural and Food Chemistry. 58 (11): 6692–6696. doi:10.1021/jf100538t. PMID 20476737.

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