Chemical composition of shallot (Allium ascalonicum Hort.).
作者： Ernesto Fattorusso , Maria Iorizzi , Virginia Lanzotti , Orazio Taglialatela-Scafati
DOI: 10.1021/JF020396T
关键词: Liliaceae 、 Flavonols 、 Chemical structure 、 Glycoside 、 Isorhamnetin 、 Quercetin 、 Stereochemistry 、 Saponin 、 Chemistry 、 Chromatography 、 Phytochemical
摘要: An extensive phytochemical analysis of the polar extracts from bulbs shallot, Allium ascalonicum Hort., led to isolation two new furostanol saponins, named ascalonicoside A1/A2 (1a/1b) and B (4), respectively, along with compounds 2a 2b, most likely extraction artifacts. On basis 2D NMR mass spectrometry data, structures novel were elucidated as furost-5(6)-en-3β,22α-diol 1β-O-β-d-galactopyranosyl 26-O-[α-l-rhamnopyranosyl-(1→2)-O-β-d-glucopyranoside] (1a), its epimer at position 22 (1b), furost-5(6),20(22)-dien-3β-ol (4). This is first report saponins in A. ascalonicum. High concentrations quercetin, isorhamnetin, their glycosides also isolated described. Keywords: Shallot; Hort.; Liliaceae; saponins; flavonol glycosides; spectroscopy
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