Abstract
Under LC-TOF-MS fraction-guided analysis, the n-butanol was extracted from Bidens pilosa. Three bioactivity isomers compounds, including methyl 3,4-dicaffeoyl quinate (1), methyl 3,5-dicaffeoyl quinate (2), and methyl 4,5-dicaffeoyl quinate (3) were successfully isolated by countercurrent chromatography (CCC) with two phase solvent system composed of chloroform-methanol-water-n-buthanol (4:3:2:0.5, v/v) elution. Their purities were 93.7%, 82.4%, and 91.8% determined by HPLC. HR-ESI-MS and NMR was used to confirm their structures. This is the first time the isolation of geometrical isomers of methyl dicaffeoyl quinates by CCC has been reported.
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