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Preparative Isolation and Purification of Three Stilbene Glycosides from the Tibetan Medicinal Plant Rheum tanguticum Maxim. Ex Balf. by High‐speed Counter‐current Chromatography
Author(s) -
Zhao XiaoHui,
Han Fa,
Li YuLin,
Yue HuiLan
Publication year - 2012
Publication title -
phytochemical analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 72
eISSN - 1099-1565
pISSN - 0958-0344
DOI - 10.1002/pca.2397
Subject(s) - chemistry , countercurrent chromatography , chromatography , glycoside , high performance liquid chromatography , organic chemistry
ABSTRACT Introduction Stilbene glycosides are the primary constituents of Rheum tanguticum Maxim. ex Balf., to which different bioactivities has been attributed, including: anti‐HIV, anti‐oxidant, anti‐tumour, anti‐malarial, and anti‐allergy activity. However, effective methods for the isolation and purification of stilbene glycosides, such as trans ‐rhapontin, cis ‐rhapontin and trans ‐desoxyrhaponticin, from this herb are not currently available. Objective To develop an efficient method for the preparative isolation and purification of three stilbene glycosides from Rheum tanguticum Maxim. ex Balf. via high‐speed counter‐current chromatography (HSCCC). Methods A solvent system composed of chloroform: n ‐butanol:methanol:water (4:1:3:2, v/v/v/v) was developed for the separation. The upper phase was used as the stationary phase, and the lower phase was used as the mobile phase. The flow rate was 1.8 mL/min. The apparatus was controlled at 800 rpm and 25 °C, and the effluent was monitored at 280 nm. Chemical constituents were analysed by high‐performance liquid chromatography (HPLC), and their structures were identified by 1 H‐ and 13 C‐NMR. Results Under the optimised conditions, 25.5 mg trans ‐rhapontin, 16.0 mg cis ‐rhapontin and 20.5 mg trans ‐desoxyrhaponticin were separated from 80 mg crude sample; the isolates had purities of 99.6, 97.2 and 99.2%, respectively. Conclusion A simple and efficient HSCCC method has been optimised for the preparative separation of stilbene glycosides from Rheum tanguticum Maxim. ex Balf. Copyright © 2012 John Wiley & Sons, Ltd.