title: [Study on qualitative and quantitatire methods for Ceratostigma willmottianum].
abstract: OBJECTIVE
  To establish the qualitative and quantitative methods of Caratostigma willmottianum.
  
  
  METHODS
  The roots of Radix Ceratostigmae were identified by TLC with the authentic medicinal material and plumbagin as the reference. The contents of plumbagin in Radix Ceratostigmae were determined by HPLC.
  
  
  RESULTS
  The TLC method was simple and specific. A Diamonsil C18 column was used. The mobile phase was methanol-water (75:25). Plumbagin in the sawple extract was separated well. The linear range of plumbagin was 33.6-313.6 ng. The average recovery of plumbagin was 100.3% and RSD was 1.9%.
  
  
  CONCLUSIONS
  The methods can be used for identification and determination of plumbagin in C. willmottianum.
authors.affiliation: School of Pharmacy, Guiyang Medical Colledge, Guiyang 550004, China.
authors.forename: Ai-min
authors.initials: AM
authors.lastname: Wang
authors.forename: Yong-lin
authors.initials: YL
authors.lastname: Wang
authors.forename: Yong-jun
authors.initials: YJ
authors.lastname: Li
authors.forename: Hong
authors.initials: H
authors.lastname: Su
authors.forename: Ping
authors.initials: P
authors.lastname: Zhao
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D002855:Chromatography, Thin Layer / Q000379:methods*; D004365:Drugs, Chinese Herbal / Q000737:chemistry; D009285:Naphthoquinones / Q000032:analysis; D029606:Plumbaginaceae / Q000737:chemistry*
chemical_list: D004365:Drugs, Chinese Herbal; D009285:Naphthoquinones; C014758:plumbagin