title: [Determination of stilbene in radix Polygoni multiflori by HPLC and its stability study].
abstract: OBJECTIVE
  To develop a HPLC method for determining stilbene in Radix Polygoni Multiflori and studying its stability.
  
  
  METHODS
  HPLC conditions: An Econosphere C18 column, a mixture of methanol-water(30:70) as mobile phase, and UV detection at 310 nm. In addition, the stability of stilbene was studied at high temperature and in acidic solution.
  
  
  RESULTS
  The linear range of calibration curve was 2.24 x 10(-2)-1.12 x 10(-1) micrograms(n = 6) with a correlation coefficient of 0.99998, the average recovery with RSD being 99.96% +/- 1.54%.
  
  
  CONCLUSIONS
  The method is sensitive, accurate and speedy. Stilbene in aqueous solution is stable, but high temperature(80 degrees C) tends to affect the stability. In acidic solution no stability can be found.
authors.affiliation: Changzheng Hospital, Second Military Medical University, Shanghai 200003.
authors.forename: C
authors.initials: C
authors.lastname: Zhang
authors.forename: S
authors.initials: S
authors.lastname: Yang
authors.forename: H
authors.initials: H
authors.lastname: Yuan
authors.forename: C
authors.initials: C
authors.lastname: Guo
authors.forename: Y
authors.initials: Y
authors.lastname: Shao
mesh_terms: D004355:Drug Stability; D018517:Plant Roots / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D028502:Polygonum / Q000737:chemistry*; D013267:Stilbenes / Q000032:analysis*
chemical_list: D013267:Stilbenes