✦ LIBER ✦
Solvent effect in 1H NMR spectra of 3′-hydroxy-4′-methoxy isoflavonoids from Astragalus membranaceus var. mongholicus
✍ Scribed by Xingang Du; Yanjing Bai; Hong Liang; Zhiying Wang; Yuying Zhao; Qingying Zhang; Luqi Huang
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 110 KB
- Volume
- 44
- Category
- Article
- ISSN
- 0749-1581
- DOI
- 10.1002/mrc.1806
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✦ Synopsis
Abstract
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.