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. 2007 Mar;62(3):231-4.

Flavan-3-ols and procyanidins from the bark of Salix purpurea L

G Jürgenliemk  1 , F Petereit, A Nahrstedt
Affiliations
  • PMID: 17416202

Flavan-3-ols and procyanidins from the bark of Salix purpurea L

G Jürgenliemk et al. Pharmazie. 2007 Mar.

Abstract

From a commercial aqueous ethanolic extract obtained from the bark of Salix purpurea L. the flavan-3-ols catechin, epicatechin, gallocatechin, catechin-3-O-(1-hydroxy-6-oxo-2-cyclohexene-1-carboxylic acid)-ester, the dimeric procyanidins B1, B3 and the trimeric procyanidins epicatechin-(4B-->8)-catechin-(4alpha-->8)-catechin and epicatechin-(4beta-->8)-epicatechin-(4beta-->8)-catechin were isolated. Structure elucidation was performed by NMR, CD, MS, degradation and optical rotation methods. A fraction containing higher oligomeric procyanidins was investigated by 13C NMR. Data indicate an average degree of oligomerization of 4 to 5 flavan-3-ol units with dihydroxylated B-rings and predominance of 2,3-cis-stereochemistry.

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