Isolation and Characterization of an Unknown Flavonoid in Dry Extracts fromPassiflora incarnata
作者:
Stefano Chimichi,
Valentina Mercati,
Gloriano Moneti,
Andrea Raffaelli,
Emilio Toja,
期刊:
Natural Product Letters
(Taylor Available online 1998)
卷期:
Volume 11,
issue 3
页码: 225-232
ISSN:1057-5634
年代: 1998
DOI:10.1080/10575639808044951
出版商: Taylor & Francis Group
关键词: C-glycosylflavonoids;Passiflora Incarnata L;Mass spectrometry;1H-NMR;13C-NMR
数据来源: Taylor
摘要:
HPLC analyses of dry extracts obtained fromPassiflora incarnatarevealed the presence of ten known flavonoids whose structures were characterised by ionspray ioni-zation tandem mass spectrometry; in addition, three unidentified peaks, F1, F2, and F3 appeared in the flavonoid region of the chromatogram. Two components were detected in F3 by on-line HPLC-ISI-MS analysis, named F3a and F3b. F2 was demonstrated to be a structural isomer of schaftoside (1), and F3a of isoschaftoside (2), with apigenin as the common aglycone and molecular weight 564. Mass spectra and 2D-NMR experiments allowed us to assign the structure of 6-β-D-glucopyranosyl-8-β-D-ribopyranosyl apigenin to the new di-C-glycosylflavonoid F2.
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