title: [Study on steroidal saponins of Dioscorea septemloba thunb].
abstract: OBJECTIVE
  To isolate and identify steroidal saponins from the rhizomes of Dioscorea septemloba Thunb.
  
  
  METHODS
  The compounds were isolated by solvent extraction, column chromatography on silica gel and ODS, and their structures were elucidated on the base of chemical and spectral analyses.
  
  
  RESULTS
  Three steroidal saponins were isolated from the rhizomes of Dioscorea septemloba Thunb, and their structures were detemined as dioscin (I), protodioscin (II), protogracillin (III).
  
  
  CONCLUSIONS
  Compound II and III were obtained from the rhizomes of Dioscorea septemloba Thunb for the first time.
authors.affiliation: Institute of Radiation Medicine, Academy of Military Medical Sciences, Beijing 100850, China.
authors.forename: Da-Wei
authors.initials: DW
authors.lastname: Tan
authors.forename: Li-Ping
authors.initials: LP
authors.lastname: Kang
authors.forename: Ning
authors.initials: N
authors.lastname: Lü
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang
authors.forename: Bai-Ping
authors.initials: BP
authors.lastname: Ma
mesh_terms: D027742:Dioscorea / Q000737:chemistry*; D004144:Diosgenin / Q000031:analogs & derivatives / Q000737:chemistry / Q000302:isolation & purification; D015394:Molecular Structure; D035281:Plant Tubers / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D012503:Saponins / Q000737:chemistry / Q000302:isolation & purification*; D013256:Steroids / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D012503:Saponins; D013256:Steroids; C019357:dioscin; C459619:protodioscin; D004144:Diosgenin