Preparative isolation and purification of trans-3,5,4'-trihydroxystilbene-4'-O-beta-D-glucopyranoside and (+)catechin from Rheum tanguticum Maxim. ex Balf. using high-speed counter-current chromatography by stepwise elution and stepwise increasing the flow-rate of the mobile phase |
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Authors: | Jin Wei Tu Peng-Fei |
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Affiliation: | School of Pharmaceutical Sciences, Peking University Health Science Center, Department of Natural Medicine, No. 38, Xueyuan Road, Beijing 100083, China. |
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Abstract: | Preparative high-speed counter-current chromatography (HSCCC) was successfully used for isolation and purification of trans-3,5,4'-trihydroxystilbene-4'-O-beta-D-glucopyranoside (compound 1) and (+)catechin (compound 2) from Rheum tanguticum Maxim. ex Balf. by stepwise elution with a pair of two-phase solvent system composed of ethyl acetate-ethanol-water (25:1:25, v/v) and (5:1:5, v/v), and stepwise increasing the flow-rate of the mobile phase from 0.8 to 2.0 mlmin(-1) after 5 h. The preparative HSCCC separation was performed on 250 mg of crude extract yielding pure compound 1 (10.2 mg) and compound 2 (26.7 mg) all at purities of over 96% in a single run. The structures of the two compounds have been elucidated by means of spectroscopic methods including MS and 1H, 13C nuclear magnetic resonance spectroscopy. |
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Keywords: | (+)Catechin High-speed counter-current chromatography Corresponding author. Tel.: +86 10 8280 2750 fax: +86 10 8280 2750. |
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