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Seven diterpene lactones, andrographolide ( 1 ), isoandrographolide ( 2 ), neo-andrographolide ( 3 ), 14-deoxy-11,12-didehydroandrographolide ( 4 ), 14-deoxyandrographiside ( 5 ), 14-deoxy-11,12-didehydroandrographiside ( 6 ), 3,14-dideoxyandrographolide ( 10 ), and three flavones, andrographidine C ( 7 ), andrographidine A ( 8 ), 5-hydroxy-7,8-dimethoxyflavanone ( 9 ) have been successfully and efficiently isolated from A. paniculata using an off-line two dimensional (2D) high-speed counter-current chromatography (HSCCC) method for the first time. For the first dimension HSCCC separation, petroleum ether-ethyl acetate-methanol-water 3:7:5:5 ( v / v ) was employed to isolate 14.4 mg of compound 1 , 3.1 mg of compound 2 , 7.8 mg of compound 3 , and 18.0 mg of compound 4 from 200 mg of the A. paniculata extract. For the second dimension HSCCC separation, petroleum ether-ethyl acetate-methanol-water 2:8:1:9 ( v / v ) and 5:5:6:4 ( v / v ) were employed to isolate the collected fractions ranged from 55 to 79 min and the flow out fraction, respectively, which led to 5.1 mg of compound 5 , 4.4 mg of compound 6 , 2.4 mg of compound 7 , 3.3 mg of compound 8 , 4.0 mg of compound 9 , 7.0 mg of compound 10 . The structures of these diterpene lactones and flavones were elucidated by extensive spectroscopic methods.

molecules/molecules online/molecules annual

Preparative Separation of Diterpene Lactones and Flavones from Andrographis paniculate Using Off-Line Two-Dimensional High-Speed Counter-Current Chromatography