title: [A new triterpenoid saponin from stems of Akebia trifoliata].
abstract: OBJECTIVE
  To study the chemical constituents of the stems of Akebia trifoliata (Thunb.) Koidz. var. australis (Diels) Rehd.
  
  
  METHODS
  The compounds were isolated and purified by recrystallization and chromatography on silica gel and ODS column. Their structures were elucidated on the basis of physicochemical properties and spectral analysis.
  
  
  RESULTS
  Six compounds were identified as 2 alpha, 3 beta,23-trihydroxyolean-12-en-28-oic acid O-beta-D-xylopyranosyl-(1 --> 3)-O-alpha-L-rhamnopyranosyl-(1 --> 4)-O-beta-D-glucopyranosyl-(1 --> 6)-beta-D-glucopyranosyl ester (I), 2 alpha, 3 beta, 23-trihydroxyurs-12-en-28-oic acid O-beta-D-xylopyranosyl-(1 --> 3)-O-alpha-L-rhamnopyranosyl-(1 --> 4)-O-beta-D-glucopyranosyl-(1 --> 6 )-beta-D-glucopyranosyl ester (II), 2 alpha, 3 beta, 23-trihydroxyolean-12-en-28-oic acid O-alpha-L-rhamnopyranosyl-(1 --> 4)-O-beta-D-glucopyranosyl-(1 --> 6)-beta-D-glucopyranosyl ester (III), 2alpha, 3beta, 23-trihydroxyurs-12-en-28-oic acid O-alpha-L-rhamnopyranosyl-(1 --> 4)-O-beta-D-glucopyranosyl-(1 --> 6)-beta-D-glucopyranosyl ester (IV), 2 alpha, 3 beta, 23-trihydroxyolean-12-en-28-oic acid O-beta-D-glucopyranosyl ester (V), 2 alpha, 3 alpha, 23-trihydroxyurs-12-en-28-oic acid O-beta-D-glucopyranosyl ester (VI).
  
  
  CONCLUSIONS
  Compound II, named mutongsaponin C, is a new triterpenoid saponin and others were isolated from the stems of Akebia trifoliata (Thunb.) Koidz. var. australis (Diels) Rehd for the first time.
authors.affiliation: Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China.
authors.forename: Hui-min
authors.initials: HM
authors.lastname: Gao
authors.forename: Zhi-min
authors.initials: ZM
authors.lastname: Wang
mesh_terms: D002850:Chromatography, Gel; D003460:Crystallization; D019684:Magnoliopsida / Q000737:chemistry*; D015394:Molecular Structure; D018547:Plant Stems / Q000737:chemistry*; D010946:Plants, Medicinal / Q000737:chemistry; D012503:Saponins / Q000737:chemistry* / Q000302:isolation & purification; D058428:Silica Gel; D012822:Silicon Dioxide; D014315:Triterpenes / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: C526388:2,3,23-trihydroxyurs-12-en-28-oic acid O-xylopyranosyl-1-3-rhamnopyranosyl-1-4-glucopyranosyl-1-6-glucopyranosyl ester; D012503:Saponins; D014315:Triterpenes; D058428:Silica Gel; D012822:Silicon Dioxide