title: [Determination of flavone for Scutellaria baicalensis from different areas by HPLC].
abstract: OBJECTIVE
  To describe the difference between native and nonative herbs by determining contents of seven kinds of flavone for twenty-five samples from seventeen areas.
  
  
  METHODS
  HPLC. Fluid phase: MEOH-H2O-CH3COOH(ICE) (41:59:0.2) and (50:50:0.2). Detection wavelength: 275.
  
  
  RESULTS
  The contents of baicalin are 6%-9%, wogenin are 2%-8%, baicalein are 0.1%-1.6%, neobaicalein are 0.01%-0.2%, wogonin are 0.01%-0.3%, visidulin and oroxylin are trace amounts or undetected.
  
  
  CONCLUSIONS
  The native and nonative herbs have no distinct differce in absolute component ratio. The ratio of baicalin and wogenin is under three. The ratio of baicalin and baicalein, baicalin and wogonin is between twenty and fifty.
authors.affiliation: Institute of Chinese Materia Medica, China Academy of TCM, Beijing 100070, China.
authors.forename: Li-xin
authors.initials: LX
authors.lastname: Yang
authors.forename: Dai
authors.initials: D
authors.lastname: Liu
authors.forename: Xue-feng
authors.initials: XF
authors.lastname: Feng
authors.forename: Shu-lian
authors.initials: SL
authors.lastname: Cui
authors.forename: Jing-yu
authors.initials: JY
authors.lastname: Yang
authors.forename: Xiao-jun
authors.initials: XJ
authors.lastname: Tang
authors.forename: Xi-rong
authors.initials: XR
authors.lastname: He
authors.forename: Ju-fu
authors.initials: JF
authors.lastname: Liu
authors.forename: Shi-lin
authors.initials: SL
authors.lastname: Hu
mesh_terms: D002851:Chromatography, High Pressure Liquid; D044950:Flavanones; D005419:Flavonoids / Q000032:analysis*; D018517:Plant Roots / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D011786:Quality Control; D031364:Scutellaria baicalensis / Q000737:chemistry*
chemical_list: D044950:Flavanones; D005419:Flavonoids; C038044:baicalin; C006680:baicalein; C085514:wogonin