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Salting-in counter-current chromatography separation of tanshinones based on room temperature ionic liquids
- Wang, Yanyan, Zhang, Lihong, Guo, Xiuyun, Wu, Shihua
- Journal of chromatography 2018 v.1559 pp. 149-155
- ambient temperature, aqueous solutions, countercurrent chromatography, ethyl acetate, hydrophobicity, ionic liquids, lipophilicity, liquids, partition coefficients
- Ionic liquids have been widely used for the extraction and separation of bioactive natural and synthetic mixtures. In this study, we provided an updated example by using an ionic liquid-based salting-in counter-current chromatography (CCC) strategy for the separation of hydrophobic tanshinones without subsequent column chromatography purification. Several ionic liquids such as 1-allyl-3-methylimidazolium chloride ([AMIM]Cl), 1-methallyl-3-methylimidazolium chloride ([MAMIM]Cl) and 1-butyl-3-ethylimidazolium chloride [BMIM]Cl could significantly decrease the partition coefficients (K) of tanshinones in the selected two-phase solvent composed of hexane-ethyl acetate-methanol-ionic liquid aqueous solution (5:5:6:4, v/v). Typically, K values of three target tanshinones including tanshinone I, 1,2-dihydrotanshinquione and tanshinone IIA were reduced from 3.57, 4.57 and 5.50 to 1.62, 2.33 and 3.08, respectively, by the inclusion of 10% [AMIM]Cl in the solvent system. After salting-in CCC separation, the purified tanshinones were obtained only by simple ethyl acetate extraction. In general, the current results demonstrated that the ionic liquid-based salting-in CCC may be as an alternative strategy for the optimization of CCC solvent systems and separation of lipophilic natural products.