title: Procyanidin xylosides from the bark of Betula pendula.
abstract: A procyanidin dimer xyloside, catechin-(4α→8)-7-O-β-xylopyranosyl-catechin, was isolated from the inner bark of Betula pendula and its structure was determined using 1D and 2D NMR, CD and high-resolution ESIMS. Interestingly, the 7-O-β-xylopyranose unit was found to be present in the lower terminal unit of the dimer. In addition to this procyanidin dimer xyloside, an entire series of oligomeric and polymeric procyanidin xylosides was detected. Their structures were investigated by hydrophilic interaction HPLC-HRESIMS. Procyanidin glycosides are still rarely found in nature.
authors.affiliation: Laboratory of Organic Chemistry and Chemical Biology, Department of Chemistry, University of Turku, Turku, Finland. jaana.liimatainen@utu.fi
authors.forename: Jaana
authors.initials: J
authors.lastname: Liimatainen
authors.forename: Maarit
authors.initials: M
authors.lastname: Karonen
authors.forename: Jari
authors.initials: J
authors.lastname: Sinkkonen
mesh_terms: D029662:Betula / Q000737:chemistry*; D044946:Biflavonoids / Q000737:chemistry / Q000302:isolation & purification*; D002392:Catechin / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification; D005591:Chemical Fractionation / Q000379:methods; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D002942:Circular Dichroism; D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification*; D057927:Hydrophobic and Hydrophilic Interactions; D008968:Molecular Conformation; D024301:Plant Bark / Q000737:chemistry*; D010936:Plant Extracts; D044945:Proanthocyanidins / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D044946:Biflavonoids; D006027:Glycosides; D010936:Plant Extracts; D044945:Proanthocyanidins; C572818:catechin-(4alpha-8)-7-O-beta-xylopyranosyl-catechin; C010807:xylosides; C017674:procyanidin; D002392:Catechin