title: [Studies on chemical constituents of alpinia katsumadai].
abstract: OBJECTIVE
  To study the chemical constituents from the ethanolic extract of Alpinia katsumadai Hayata.
  
  
  METHODS
  The compounds were separated with the column chromatographic, and their structures were identified by chemical and spectroscopic methods.
  
  
  RESULTS
  Eight compounds were isolated from the ethanol extract. On the basis of their physical and chemical properties and spectroscopic analysis, the structures of seven compounds were identified. They were 1,7-Diphenyl-5-hydroxy-4, 6-heptadien-3-one(I), 1,7-Diphenyl4, 6-heptadien-3-one(II), Pinocembrin (III), Cardamomin (IV), Alpinetin (V), 7,4'-Dihydroxy-5-methoxy flavanones(VI) and beta-Sitosterol(VIII), respectively.
  
  
  CONCLUSIONS
  Compounds I , II and VII are separated from this plant for the first time. Compounds I and II are also obtained from this genus of Alpinetin for the first time.
authors.affiliation: Guangzhou Institute for Drug Control, Guangzhou 510160, China.
authors.forename: Xiu-Qin
authors.initials: XQ
authors.lastname: Wang
authors.forename: Xiao-Jiang
authors.initials: XJ
authors.lastname: Yang
authors.forename: Jiao-She
authors.initials: JS
authors.lastname: Li
mesh_terms: D047188:Chalcones / Q000737:chemistry / Q000302:isolation & purification; D044950:Flavanones / Q000737:chemistry / Q000302:isolation & purification*; D010946:Plants, Medicinal / Q000737:chemistry*; D012639:Seeds / Q000737:chemistry; D012855:Sitosterols / Q000737:chemistry / Q000302:isolation & purification*; D013056:Spectrophotometry, Ultraviolet; D030521:Zingiberaceae / Q000737:chemistry*
chemical_list: D047188:Chalcones; D044950:Flavanones; D012855:Sitosterols; C436748:alpinetin; C025473:gamma-sitosterol; C016063:pinocembrin; C436747:cardamonin