Procyanidin B2
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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 | |
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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). Y verify (what is YN ?) 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]
See also
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.
- v
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- Dimers : Procyanidin A1
- A2
- Trimers:Cinnamtannin B1
- Tetramers: Arecatannin A2
- Dimers : Procyanidin B1
- B2
- B3
- B4
- B5
- B6
- B8
- D (ent-Epicatechin(4α→8)catechin)
- Trimers: Arecatannin B1 (epicatechin-(4β→8)-epicatechin-(4β→6)-catechin)
- Procyanidin C1 (epicatechin-(4β→8)-epicatechin-(4β→8)-epicatechin)
- Procyanidin C2 (catechin-(4α→8)-catechin-(4α→8)-catechin)
- Tetramers : Cinnamtannin A2
- Arecatannins
- Arecatannin A1
- Arecatannin A3
- Arecatannin B2
- Arecatannin C1
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