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Separation of six compounds including two n‐butyrophenone isomers and two stibene isomers from Rheum tanguticum Maxim by recycling high speed counter‐current chromatography and preparative high‐performance liquid chromatography
- Chen, Tao, Yang, Xue, Wang, Nana, Li, Hongmei, Zhao, Jingyang, Li, Yulin
- Journal of separation science 2018 v.41 no.19 pp. 3660-3668
- Rheum tanguticum, bioactive compounds, countercurrent chromatography, emodin, high performance liquid chromatography, isomers, recycling
- Six compounds including two n‐butyrophenone isomers and two stibene isomers were obtained from Rheum tanguticum Maxim. Two n‐butyrophenone isomers with a separation factor of 1.14 were successfully separated by recycling high‐speed counter‐current chromatography after ten cycles. Two stibene isomers were successfully separated by preparative high‐performance liquid chromatography. High‐performance liquid chromatography analysis showed that the purities of the compounds were all over 98%. These compounds were identified as lindleyin, isolindleyin, resveratrol‐4′‐O‐(2″‐O‐galloyl)‐glucopyranoside, resveratrol‐4′‐O‐(6′′‐O‐galloyl)‐glucopyranoside, emodin 1‐O‐β‐d‐glucoside, and 3,5‐dihydroxy‐4′‐methoxystilbene‐3‐O‐β‐d‐glucopyranoside. The results indicated that recycling high‐speed counter‐current chromatography and preparative high‐performance liquid chromatography could be effective combination for the preparation of bioactive compounds from Rheum tanguticum Maxim.