Hongjing Dong

TL;DR: High-speed counter-current chromatography was used to separate cyclic peptides from an extract of the seeds of Vaccaria segetalis and the chemical structures of the target compounds were confirmed by high resolution electrospray ionization time of flight MS and (1)H NMR analyses.

TL;DR: The developed RRLC-QQQ assay is an efficient method for separation and determination of artemisinin from the plant samples of Artemisia annua L.

TL;DR: In this article, a two-phase solvent system was composed of petroleum ether-ethyl acetate-methanol-water (3:7:1:9, v/v), where 20 mM of triethylamine (TEA) was added to the upper phase as a retainer and 5 mM of hydrochloric acid (HCl) to the aqueous phase as an eluter.

TL;DR: Results of the present study successfully indicated that this method was efficient for the preparative separation of alkaloids from natural plants.

TL;DR: In this article, the preparation of strychnine and brucine from a crude extract of Strychnos nuxvomica L. has been successfully performed for the first time using pH-zone- refining countercurrent chromatography.