title: [Determination of zizybeoside II of Ziziphus jujuba by HPLC].
abstract: OBJECTIVE
  To develop a quantitative method for determination of zizybeoside II in Ziziphus jujuba.
  
  
  METHODS
  The samples were separated at 30 degrees C on a Zorbax SB-C18 column eluted with methanol-water (20 : 80) as the mobile phase. Flow rate was set at 1.0 mL x min(-1) and the detection wavelength was set at 210 nm.
  
  
  RESULTS
  The calibration curve was linear within the range from 0.046 to 0.582 microg (r = 0.999 9) and the average recovery was 97.2%. 12 batches of the crude drugs purchased from different areas were determined and the contents of zizybeoside II in Fructus Jujubae were fluctuated from 0.013% to 0.041%.
  
  
  CONCLUSIONS
  The method is simple, repeatable and could be used for the quality control of Z. jujuba.
authors.affiliation: College of Veterinary Medicine, Northwest Agricultural and Forest University, Yangling 712100, China.
authors.forename: Ji-Wei
authors.initials: JW
authors.lastname: Niu
authors.forename: Qi-Wei
authors.initials: QW
authors.lastname: Zhang
authors.forename: Mu-Xin
authors.initials: MX
authors.lastname: Gong
authors.forename: Li-Hua
authors.initials: LH
authors.lastname: Yan
authors.forename: Jing-Jing
authors.initials: JJ
authors.lastname: Zhu
authors.forename: Zhi-Min
authors.initials: ZM
authors.lastname: Wang
authors.forename: Qin-Fan
authors.initials: QF
authors.lastname: Li
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification; D012503:Saponins / Q000032:analysis*; D031957:Ziziphus / Q000737:chemistry*
chemical_list: D004365:Drugs, Chinese Herbal; D012503:Saponins