title: [Study on recovery of ethyl acetate after extracting tripterygium wifordii extractum with ethyl acetate].
abstract: OBJECTIVE
  To increase the recovery rate of ethyl acetate after extracting tripterygium wifordii extractum and to decrease product cost.
  
  
  METHODS
  After extracting tripterygium wifordii extractum with ethyl acetate, 3 times saturated salt water was added in it so as to recovery ethyl acetate distilled under normal atmospheric pressure. Ethyl acetate containing salt water was purified through Na2SO4 column.
  
  
  RESULTS
  Ethyl acetate purified could be used repeatedly and the recovery rate was up to 85%.
  
  
  CONCLUSIONS
  This method is completely adapted for mass production.
authors.affiliation: Shandong Lunan Pharmaceutical Factory, Linyi 276006, Shandong, China.
authors.forename: Xue-dong
authors.initials: XD
authors.lastname: Bai
authors.forename: Li-xing
authors.initials: LX
authors.lastname: Zhang
authors.forename: Tao
authors.initials: T
authors.lastname: Chen
authors.forename: Guan-zhong
authors.initials: GZ
authors.lastname: Li
authors.forename: Xue-hai
authors.initials: XH
authors.lastname: Wang
authors.forename: Wei-guo
authors.initials: WG
authors.lastname: Zhang
mesh_terms: D000085:Acetates; D004365:Drugs, Chinese Herbal / Q000302:isolation & purification*; D010946:Plants, Medicinal / Q000737:chemistry*; D012965:Sodium Chloride; D013678:Technology, Pharmaceutical / Q000191:economics / Q000379:methods; D029757:Tripterygium / Q000737:chemistry*
chemical_list: D000085:Acetates; D004365:Drugs, Chinese Herbal; D012965:Sodium Chloride; C007650:ethyl acetate