title: [Study of the extraction technique of volatile oil from Chinese herbs for manufacturing Xiaoerjianpixiaoshi oral solution].
abstract: OBJECTIVE
  To determine the optimal extracting technique for the volatile oil from the Chinese herbs for manufacturing Xiaoerjianpixiaoshi oral solution.
  
  
  METHODS
  Two steam distillation processes were carried out to extract the volatile oil from three Chinese herbs. UV-spectrophotometry method was used to determine the oil content in the distillate, and the mathematical model was established according to volatile oil distillation process by exponential curve regression analysis.
  
  
  RESULTS
  Direct extraction of the oil by means of steam distillation process was more workable, and the decrement of oil content conformed well with the exponential model. Collection of 2 volumes of the distillate resulted in the yield of volatile oil of 61.64%.
  
  
  CONCLUSIONS
  The optimal extraction of the volatile oil can be resulted from immersion of the drugs in 8 volumes of water for 0.5 h and collection of 2 volumes of the distillate.
authors.affiliation: Department of Pharmacy, Zhujiang Hospital, First Military Medical University, Guangzhou 510282, China.
authors.forename: Ben-jie
authors.initials: BJ
authors.lastname: Zhou
authors.forename: Qian
authors.initials: Q
authors.lastname: Guo
mesh_terms: D000284:Administration, Oral; D004365:Drugs, Chinese Herbal / Q000032:analysis*; D006801:Humans; D009822:Oils, Volatile / Q000032:analysis*; D012044:Regression Analysis
chemical_list: D004365:Drugs, Chinese Herbal; D009822:Oils, Volatile