Application of accelerated solvent extraction coupled with counter-current chromatography to extraction and online isolation of saponins with a broad range of polarity from Panax notoginseng

作者：Zhang Yuchi; Liu Chunming^*; Qi Yanjuan; Li Sainan; Wang Jing

来源：Separation and Purification Technology, 2013, 106: 82-89.

DOI：10.1016/j.seppur.2012.12.031

• Temperature gradient
• Accelerated solvent extraction
• Countercurrent chromatography
• Saponins
• Panax notoginseng

Accelerated solvent extraction (ASE) coupled with high-performance counter-current chromatography (HPCCC) was successfully used for the structural modification, extraction and online isolation of the saponins with a wide range of polarity from Panax notoginseng by one extraction-separation operation with three stages. At the first stage, the upper phase of the solvent system of ethyl acetate-n-butanol-water (1:1:2 or 1.2:1:2, v:v:v) or ethyl acetate-n-butanol-methanol-water (3:5:1.5:6, v:v:v:v) was used as both the ASE solvent and HPCCC stationary phase (extracted at 60 degrees C), and the polar target compounds which pumped in the CCC column were eluted with the corresponding lower phase of the solvent system mentioned above. At the second stage, the upper phases of the solvent system of ethyl acetate-n-butanol-methanol-water (6:3:2:6 or 7:3:2:7, v:v:v:v) was used as both the ASE solvent and HPCCC stationary phase (extracted at 115 degrees C), and the target moderate polar compounds were eluted with the corresponding lower phase of the solvent system. Finally, the upper phase of the solvent system of n-hexane-n-butanol-methanol-water (8:2:2:8, v:v:v:v) or n-hexane-ethyl acetate-n-butanol-methanol-water (0.2:10:0.5:1.5:8, v:v:v:v:v) was used as both the ASE solvent and HPCCC stationary phase (extracted at 135 degrees C), and the target low polar compounds were eluted with the corresponding lower phase of the solvent system. More than nine pure compounds including notoginsenosides R-6, R-1, Spt(1) and ginsenosides Rb-1, F-4, Rh-3, Rg(3), Rs(3) and Rk(1) with a wide range of polarity were successfully separated via the seven sets of solvent systems in one extraction-separation operation within 400 min. The compounds separated by ASE/HPCCC were identified by HPLC/MS/MS and NMR.

• 出版日期2013-3-14
• 单位长春师范大学