title: [Extraction of ecdysterone from Stemmacantha uniflora].
abstract: OBJECTIVE
  To optimize the conditions for the extraction of ecdysterone from Stemmacantha uniflora.
  
  
  METHODS
  Conditions for the extraction were studied by three different methods as guided by the content of ecdysterone and solid material that present in the extract.
  
  
  RESULTS
  Methanol was the best solvent, water the second, ethanol was greatly effected by concentration. Ultrasonic extraction had a good efficiency with short time. The time of cool extraction was too long, its efficiency was inferior to the other methods.
  
  
  CONCLUSIONS
  The best methods for the extraction of ecdysterone from Stemmacantha uniflora was methanol reflux extraction.
authors.affiliation: Faculty of Material Science and Chemical Engineering, China University of Geosciences, Wuhan 430074.
authors.forename: Lili
authors.initials: L
authors.lastname: Chen
authors.forename: Hongquan
authors.initials: H
authors.lastname: Wu
authors.forename: Yi
authors.initials: Y
authors.lastname: Li
authors.forename: Qin
authors.initials: Q
authors.lastname: Shuai
mesh_terms: D019659:Asteraceae / Q000737:chemistry*; D002623:Chemistry Techniques, Analytical / Q000379:methods; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification*; D004441:Ecdysterone / Q000032:analysis / Q000302:isolation & purification*; D000432:Methanol; D018517:Plant Roots / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D012997:Solvents; D013678:Technology, Pharmaceutical / Q000379:methods; D014867:Water
chemical_list: D004365:Drugs, Chinese Herbal; D012997:Solvents; D014867:Water; D004441:Ecdysterone; D000432:Methanol