title: [Quantitative determination of vanillic acid in rhizoma Picrorhizae by TLC-scanning].
abstract: OBJECTIVE
  To establish a method to determine the content of vanillic acid in Rhizoma Picrorhizae.
  
  
  METHODS
  The content was determined by dual wavelength TLC-scanning.
  
  
  RESULTS
  The peak area of vanillic acid is reproducible in 4 hours; recovery 96.5%; RSD-3%; RSD of duplicate experiment-5%.
  
  
  CONCLUSIONS
  A thin-layer chromatographic scanning method has been developed for determining the content of vanillic acid. The method is reproducible, workable and reliable.
authors.affiliation: Institute of Traditional Chinese Medicine and Materia Medica of Jiangxi Province, Nanchang 330077.
authors.forename: J
authors.initials: J
authors.lastname: Yu
authors.forename: Y
authors.initials: Y
authors.lastname: Song
authors.forename: Y
authors.initials: Y
authors.lastname: Cheng
mesh_terms: D002855:Chromatography, Thin Layer; D003720:Densitometry; D032261:Picrorhiza / Q000737:chemistry*; D018517:Plant Roots / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D011786:Quality Control; D014641:Vanillic Acid / Q000032:analysis*
chemical_list: D014641:Vanillic Acid