Data di Pubblicazione:
2004
Citazione:
Furostanol saponins and quercetin glycosides from the leaves of Helleborus viridis L. / A. Braca, J.M. Prieto, N. De Tommasi, F. Tomè, I. Morelli. - In: PHYTOCHEMISTRY. - ISSN 0031-9422. - 65:21(2004), pp. 2921-2928.
Abstract:
Phytochemical analysis of the polar extracts of the leaves of Helleborus viridis (Ranunculaceae) resulted in the isolation of two new furostanol saponins (25R)-26-[(alpha-L-rhamnopyranosyl)oxy]-22alpha-methoxyfurost-5-en-3beta-yl O-beta-D-glucopyranosyl-(1 --> 3)-O-[6-acetyl-beta-D-glucopyranosyl-(1 --> 3)]-O-beta-D-glucopyranoside (1) and (25R)-26-[(alpha-L-rhamnopyranosyl)oxy]-22alpha-methoxyfurost-5-en-3beta-yl O-beta-D-glucopyranosyl-(1 --> 3)-O-beta-D-glucopyranosyl-(1 --> 3)- O-beta-D -glucopyranoside (2) and three new quercetin glycosides, quercetin 3-O-(2-E-caffeoyl)-alpha-L-arabinopyranosyl-(1 --> 2)-beta-D-galactopyranoside-7-O-beta-D-glucopyranoside (3), quercetin 3-O-(2-E-caffeoyl)-alpha-L-arabinopyranosyl-(1 --> 2)-beta- D-galactopyranoside (4), and quercetin 3-O-alpha-L-arabinopyranosyl-(1 --> 2)-beta-D-galactopyranoside (5). The structures of the new compounds were determined by spectroscopic analysis, including 2D NMR data and mass spectrometry.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Furostanol saponins; Helleborus viridis; Quercetin glycosides; Ranunculaceae
Elenco autori:
A. Braca, J.M. Prieto, N. De Tommasi, F. Tomè, I. Morelli
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