title: [Effects of three different drying methods on extraction and separation of ginsenosides from fresh ginseng].
abstract: OBJECTIVE
  There exists a close relationship between drying of a fresh herb and its preservation and extraction of efficient components. In order to investigate the influences of different drying methods on extraction and separation of ginsenosides, three drying processes, such as drying in the sun, drying in oven and microwave drying, were used to dry fresh ginsengs.
  
  
  METHODS
  The ginsenosides of the dry ginsengs were extracted by poaching and microwave heating, and were separated by foam separation. The concentrations of ginsenosides were measured.
  
  
  RESULTS
  Microwave drying saved both time and labor, and was favorable for release of ginsenosides. The ginsenosides could be extracted from the dry ginsengs in a shorter time by microwave heating than poaching. The ginsenosides Rb1, Rb2, Rd could be observably concentrated by foam separation.
  
  
  CONCLUSIONS
  Microwave drying and microwave assisted extraction are efficient and economic methods with a high recovery yield of ginsenosides.
authors.affiliation: Department of Bioscience and Biotechnology, Dalian University of Technology, Dalian, Liaoning Province 116024, China. daijia55@yahoo.com.cn
authors.forename: Dai-Jia
authors.initials: DJ
authors.lastname: Zhang
authors.forename: Zhi-Long
authors.initials: ZL
authors.lastname: Xiu
authors.forename: Xin-Hua
authors.initials: XH
authors.lastname: Lin
authors.forename: Dong-Jian
authors.initials: DJ
authors.lastname: Qi
mesh_terms: D003890:Desiccation / Q000379:methods*; D036145:Ginsenosides / Q000032:analysis*; D005894:Panax / Q000737:chemistry*; D010936:Plant Extracts / Q000302:isolation & purification*; D015203:Reproducibility of Results
chemical_list: D036145:Ginsenosides; D010936:Plant Extracts