An extensive phytochemical analysis of the polar extracts from bulbs of shallot, Allium ascalonicum Hort., led to the isolation of two new furostanol saponins, named ascalonicoside A1/A2 (1a/1b) and ascalonicoside B (4), respectively, along with compounds 2a and 2b, most likely extraction artifacts. On the basis of an extensive 2D NMR analysis and mass spectrometry data, the structure of the novel compounds were elucidated. This is the first report of furostanol saponins in Mediterranean Allium plants. High concentrations of quercetin, isorhamnetin and their glycosides were also isolated and described.
Chemical composition of shallot (Allium ascalonicum Hort.) / Fattorusso, Ernesto; M., Iorizzi; Lanzotti, Virginia; TAGLIALATELA SCAFATI, Orazio. - In: JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY. - ISSN 0021-8561. - STAMPA. - 50:(2002), pp. 5686-5690. [10.1021/jf020396t]
Chemical composition of shallot (Allium ascalonicum Hort.)
FATTORUSSO, ERNESTO;LANZOTTI, VIRGINIA;TAGLIALATELA SCAFATI, ORAZIO
2002
Abstract
An extensive phytochemical analysis of the polar extracts from bulbs of shallot, Allium ascalonicum Hort., led to the isolation of two new furostanol saponins, named ascalonicoside A1/A2 (1a/1b) and ascalonicoside B (4), respectively, along with compounds 2a and 2b, most likely extraction artifacts. On the basis of an extensive 2D NMR analysis and mass spectrometry data, the structure of the novel compounds were elucidated. This is the first report of furostanol saponins in Mediterranean Allium plants. High concentrations of quercetin, isorhamnetin and their glycosides were also isolated and described.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
