Purification of hydroxyanthraquinones and cinnamic acid from the roots of Rheum officinale Baill |
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Authors: | Huang Yanyan Sun Ailing Qi Yuanying Liu Renmin |
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Institution: | College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, China. |
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Abstract: | A chromatographic method for isolation and purification of chemical constituents from the well-known traditional Chinese drug Da-huang (roots of Rheum officinale Baill.) was established by using 12% cross-linked agarose gel, Superose 12, as the separation media. A two-step separation procedure is employed. Sixty five percent methanol was used as the eluent for separation of cinnamic acid, rhein, physcion and emodin form Da-huang crude extract. The fraction containing aloe-emodin and chrysophanol was then separated by using 55% methanol containing 0.5% acetic acid as the eluent. As a result, cinnamic acid and five kinds of hydroxyanthraquinones including rhein, aloe-emodin, chrysophanol, physcion and emodin were obtained. The retention behavior of hydroxyanthraquinones on Superose 12 was also studied. The retention of hydroxyanthraquinones on Superose 12 is based on a mixture of hydrogen bonding and hydrophobic interactions between the hydroxyl groups of the hydroxyanthraquinones and the residues of the cross-linking reagents used in the manufacturing process of Superose 12. |
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Keywords: | Cinnamic acid Da‐huang Hydroxyanthraquinones Rheum officinale Baill Superose 12 |
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