title: Enrichment and separation of antitumor triterpene acids from the epidermis of Poria cocos by pH-zone-refining counter-current chromatography and conventional high-speed counter-current chromatography.
abstract: Triterpene acids were extracted from the epidermis of Poria cocos (Schw.) Wolf. These acids were found to inhibit the growth of lung cancer cells in vitro and in vivo. An efficient method for the preparative separation of antitumor triterpene acids was established that involves the combination of pH-zone-refining counter-current chromatography and conventional high-speed counter-current chromatography. We used pH-zone-refining counter-current chromatography to concentrate the triterpene acids using a two-phase solvent system composed of petroleum ether/ethyl acetate/methanol/water (3:7:5:5, v/v/v/v), trifluoroacetic acid (10 mM) was added to the upper phase as a retainer, and ammonia (10 mM) was added to the lower phase as an eluter. As a result, 200 mg concentrate of triterpene acids was obtained from 1.0 g of crude extract. The concentrate was further separated by conventional high-speed counter-current chromatography using a solvent system composed of petroleum ether/ethyl acetate/methanol/water (0.8:1.2:1.2:0.9, v/v), yielding 50 mg of poricoic acid A and 5 mg of poricoic acid B from 120 mg concentrate, respectively. The inhibitory activity of the major compound on lung A549 cells was examined and poricoic acid A was found to significantly inhibit the growth of A 549 cells.
authors.affiliation: Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, 16 Nanxiaojie, Dongzhimennei Ave, Beijing, China.
authors.forename: Hongjing
authors.initials: H
authors.lastname: Dong
authors.affiliation: Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, 16 Nanxiaojie, Dongzhimennei Ave, Beijing, China.|Anhui University of Chinese Medicine, Xiangshan Road, Yaohaiqu, Hefei, China.
authors.forename: Panpan
authors.initials: P
authors.lastname: Wu
authors.affiliation: Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, 16 Nanxiaojie, Dongzhimennei Ave, Beijing, China.
authors.forename: Renyi
authors.initials: R
authors.lastname: Yan
authors.affiliation: Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, 16 Nanxiaojie, Dongzhimennei Ave, Beijing, China.
authors.forename: Qihua
authors.initials: Q
authors.lastname: Xu
authors.affiliation: Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, 16 Nanxiaojie, Dongzhimennei Ave, Beijing, China.
authors.forename: Hua
authors.initials: H
authors.lastname: Li
authors.affiliation: Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, 16 Nanxiaojie, Dongzhimennei Ave, Beijing, China.
authors.forename: Fangbo
authors.initials: F
authors.lastname: Zhang
authors.affiliation: Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, 16 Nanxiaojie, Dongzhimennei Ave, Beijing, China.
authors.forename: Jianrong
authors.initials: J
authors.lastname: Li
authors.affiliation: Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, 16 Nanxiaojie, Dongzhimennei Ave, Beijing, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Yang
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000302:isolation & purification* / Q000627:therapeutic use; D018827:Carcinoma, Lewis Lung / Q000188:drug therapy / Q000473:pathology; D003377:Countercurrent Distribution / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D051379:Mice; D008810:Mice, Inbred C57BL; D055441:Poria / Q000737:chemistry*; D014315:Triterpenes / Q000302:isolation & purification*
chemical_list: D000970:Antineoplastic Agents; D014315:Triterpenes
keywords: Antitumor activity; Counter-current chromatography; Epidermis; Poria cocos; Triterpene acids