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Solvent effect in 1 H NMR spectra of 3′‐hydroxy‐4′‐methoxy isoflavonoids from Astragalus membranaceus var. mongholicus
Author(s) -
Du Xingang,
Bai Yanjing,
Liang Hong,
Wang Zhiying,
Zhao Yuying,
Zhang Qingying,
Huang Luqi
Publication year - 2006
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1806
Subject(s) - chemistry , calycosin , astragalus , proton nmr , two dimensional nuclear magnetic resonance spectroscopy , solvent , isoflavonoid , stereochemistry , nmr spectra database , nuclear magnetic resonance spectroscopy , spectral line , organic chemistry , flavonoid , formononetin , medicine , daidzein , alternative medicine , physics , traditional chinese medicine , pathology , astronomy , genistein , antioxidant
Four 3′‐hydroxy‐4′‐methoxy‐isoflavonoids: calycosin‐7‐ O ‐β‐ D ‐glucopyranoside (1), calycosin (2), pratensein‐7‐ O ‐β‐ D ‐glucopyranoside (3), and pratensein (4) were isolated from Astragalus membranaceus var. mongholicus , among which compound 4 was obtained from this plant for the first time. The solvent effect obscuring 1 H signal patterns of B ring of compounds 1–4 was reported to avoid mis‐assignments. Previously reported NMR data of compounds 1 and 2 were corrected based on 1D and 2D NMR experiments. Copyright © 2006 John Wiley & Sons, Ltd.