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• W2079804150 abstract "Counter-current chromatography (CCC) combined with pre-separation by ultrasonic solvent extraction was successively used for the separation of series bioactive compounds from the crude extract of Hypericum perforatum L. The petroleum ether extract was separated by the solvent system of n-heptane–methanol–acetonitrile (1.5:0.5:0.5, v/v) and n-heptane–methanol (1.5:1, v/v) in gradient elution, yielding a phloroglucinol compound, hyperforin with HPLC purity over 98%. The ethyl acetate extract was separated by using the solvent system composed of hexane–ethyl acetate–methanol–water (1:1:1:1 and 1:3:1:3, v/v) in gradient through both reverse phase and normal phase elution mode, yielding a naphthodianthrone compound, hypericin with HPLC purity about 95%. The n-butanol extract was separated with the solvent system composed of n-butanol–ethyl acetate–water (1:4:5 and 1.5:3.5:5, v/v) in elution and back-extrusion mode, yielding two of flavones, rutin and hyperoside, with HPLC purity over 95%. HPLC–MS, reference sample and UV spectrum were selectively used in separation to search for target compounds from HPLC-DAD profiles of different sub-extracts. The structures of isolated compounds were further identified by ESI-MS, 1HNMR and 13CNMR." @default.
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• W2079804150 date "2011-03-01" @default.
• W2079804150 modified "2023-09-27" @default.
• W2079804150 title "Isolation and purification of series bioactive components from Hypericum perforatum L. by counter-current chromatography" @default.
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• W2079804150 doi "https://doi.org/10.1016/j.jchromb.2011.01.007" @default.
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