title: [Determination of catalpol in dried rehmannia root and Taohong Siwu Decoction with high performance liquid chromatography].
abstract: OBJECTIVE
  To determinate the catalpol contents in dried rehmannia root and Taohong Siwu Decoction containing rehmannia root with high performance liquid chromatography (HPLC).
  
  
  METHODS
  Catalpol was separated on a YWG-C18 column using water-acetonitrile (99.4:0.6) as mobile phase and detective wavelength at 210 nm.
  
  
  RESULTS
  The linear curve of tested catalpol concentration within the range of 0.0536-5.3600 microg/microl was ideal (n=5, r=0.999 7). The average recovery rate of the dried rehmannia root and Taohong Siwu decoction was 98.7% (RSD=0.48%) and 98.2% (RSD=1.29%) respectively.
  
  
  CONCLUSIONS
  HPLC method is accurate and valuable for the quality control of Radix Rehmanniae and Taohong Siwu Decoction.
authors.affiliation: Department of Chemistry, Hebei North University, Zhangjiakou, Hebei Province 075000, China. chy-guo@sohu.com
authors.forename: Chun-Yan
authors.initials: CY
authors.lastname: Guo
authors.forename: Xue-Mei
authors.initials: XM
authors.lastname: Bai
authors.forename: Wan-Ming
authors.initials: WM
authors.lastname: Zhang
authors.forename: Zhi-Bao
authors.initials: ZB
authors.lastname: Wang
authors.forename: Yu-Rong
authors.initials: YR
authors.lastname: Fu
mesh_terms: D002851:Chromatography, High Pressure Liquid; D005960:Glucosides / Q000032:analysis*; D057888:Iridoid Glucosides; D039823:Iridoids / Q000032:analysis*; D008516:Medicine, Chinese Traditional; D032267:Rehmannia / Q000737:chemistry*
chemical_list: D005960:Glucosides; D057888:Iridoid Glucosides; D039823:Iridoids; C078040:catalpol