Please use this identifier to cite or link to this item:
Title: Dimeric anthocyanins from strawberry (Fragaria ananassa) consisting of pelargonidin 3-glucoside covalently linked to four flavan-3-ols
Authors: Fossen, Torgils
Rayyan, Saleh
Andersen, Øyvind M.
Keywords: Flavonoids - Analysis;Flavonoids - Structure;Flavonoids - Spectra;Anthocyanins - Physiological effect;Starwberries - Color
Issue Date: 2004
Abstract: Flavanol–anthocyanin complexes were isolated by successive use of Amberlite XAD-7 chromatography, Sephadex LH-20 gel filtration and preparative HPLC from acidified, methanolic extract of strawberries (Fragaria ananassa Dutch.). These purple minor pigments were characterized by UV–Vis spectroscopy, 1D and 2D NMR techniques, and electrospray mass spectrometry to be catechin( 4a ! 8)pelargonidin 3-O-b-glucopyranoside (1), epicatechin(4a ! 8)pelargonidin 3-O-b-glucopyranoside (2), afzelechin(4a ! 8)pelargonidin 3-O-b-glucopyranoside (3) and epiafzelechin(4a ! 8)pelargonidin 3-O-b-glucopyranoside (4). The stereochemistry at the 3- and 4-positions of the flavan-3-ol units was based on assumption ofR-configuration at C-2. Each of the four pigments occurred in theNMR solvent as a pair of rotamers. Proved by cross-peaks in the 1H–1HNOESYNMRspectra of 1, 2 and 4, the two conformations within each rotameric pair were in equilibrium with each other. Even though 1 and 2 are based on a different aglycone, their structures may be similar to tentatively identified pigments, which have been assumed to contribute to the colour of red wines.
Appears in Collections:Fulltext Publications

Files in This Item:
File Description SizeFormat
Dimeric anthocyanins from strawberry.pdf208.11 kBAdobe PDFView/Open
Show full item record

Page view(s)

Last Week
Last month
checked on Jun 27, 2024


checked on Jun 27, 2024

Google ScholarTM


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.