salix daphnoides: a screening for oligomeric and polymeric proanthocyanidins

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ID: 147972
2015
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Abstract
In the present study, a qualitative analysis of proanthocyanidins (PAs) from an aqueous-methanolic extract of Salix daphnoides VILL. bark is described. Procyanidin B1 (1), B2 (2), B3 (3), B4 (4), C1 (5), epicatechin-(4β→8)-epicatechin-(4β→8)-catechin (6) and epicatechin-(4β→8)-epicatechin-(4β→8)-epicatechin-(4β→8)-catechin (7) have been isolated by a combination of different chromatographic separations on Sephadex® LH-20-, MCI®-, Diol-and RP-18-phases. Mass spectrometry, 1D- and 2D-NMR, circular dichroism and polarimetry were used for their structure elucidation and verification by comparison with the literature. Additionally, two fractions of very polar flavan-3-ols were compared: “regular” polymeric PAs received at the very end of the Sephadex® LH-20 chromatography showing no mobility on silica TLC and “unusual” PAs with the same RF-value but already eluting together with flavonoids in the Sephadex® LH-20 system. These “unusual” PAs were subsequently enriched by centrifugal partition chromatography (CPC). 13C-NMR, polarimetry, thiolysis, acid hydrolysis and phloroglucinol degradation were used to characterize both fractions. Differences in the composition of different flavan-3-ol units and the middle chain length were observed.
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wiesneth2015moleculessalix Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Stefan Wiesneth, Frank Petereit, Guido Jürgenliemk
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Journal Journal of ethnopharmacology
Year 2015
DOI
10.3390/molecules200813764
URL
http://www.mdpi.com/1420-3049/20/8/13764
Keywords
flavan-3-ols proanthocyanidins procyanidins polymeric proanthocyanidinsorganic chemistry

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