title: [A quantitative method for simultaneous assay of four flavones with one marker in Radix Scutellariae].
abstract: OBJECTIVE
  To develop a quantitative method for simultaneously determining four flavones in Radix Scutellariae, by using one chemical standard substance.
  
  
  METHODS
  The relative correction factors (RCF) of four flavones were determined by HPLC-DAD. Within the linear ranges, the values of RCF at 274 nm of wogonoside, baicalein, and wogonin to baicalin, were 0.7467, 0.5638, 0.4351, respectively. And the contents of baicalin in 27 samples of Scutellaria baicalensis were authentically determined by the external standard method, and the contents of the three other flavones were calculated according to their RCF. The contents of these four flavones in the all samples were determined with the external standard method.
  
  
  RESULTS
  The RCF had a good reproducibility (RSD 0.66%-2.83%). No significant differences between the quantitative results by the above two methods were observed.
  
  
  CONCLUSIONS
  It is a fast, convenient, and accurate method to determine multi-components especially when some authentic standard substances were unavailable. It can be used as a method to control the quality of Radix Scutellariae.
authors.affiliation: Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China.
authors.forename: Jingjing
authors.initials: J
authors.lastname: Zhu
authors.forename: Zhimin
authors.initials: Z
authors.lastname: Wang
authors.forename: Qiwei
authors.initials: Q
authors.lastname: Zhang
authors.forename: Jiwei
authors.initials: J
authors.lastname: Niu
authors.forename: Feng
authors.initials: F
authors.lastname: Li
mesh_terms: D002851:Chromatography, High Pressure Liquid; D044950:Flavanones / Q000737:chemistry; D047309:Flavones / Q000737:chemistry*; D005419:Flavonoids / Q000737:chemistry; D005960:Glucosides / Q000737:chemistry; D010936:Plant Extracts / Q000737:chemistry*; D031364:Scutellaria baicalensis / Q000737:chemistry*
chemical_list: D044950:Flavanones; D047309:Flavones; D005419:Flavonoids; D005960:Glucosides; D010936:Plant Extracts; C499814:Scutellaria baicalensis extract; C038044:baicalin; C006680:baicalein; C473995:wogonoside; C085514:wogonin