title: [A novel approach to quality evaluation of root of Scutellaria baicalensis by DPPH free radical scavenging].
abstract: OBJECTIVE
  To develop a simple, reliable approach for evaluating the quality of Huangqin (Scutellaria baicalensis).
  
  
  METHODS
  To determine the DPPH free radical scavenging activity and assay of four bioactive components: baicalin, baicalein, wogonin and wogonin-7-O-glucuronide by HPLC.
  
  
  RESULTS
  The correlative relationship between DPPH free radical scavenging activity and baicalin content was obtained.
  
  
  CONCLUSIONS
  Bioassay of DPPH free radical scavenging activity could be used as one of the methods for quality evaluation of Chinese drug Huangqin.
authors.affiliation: Institute of Chinese Materia Medica, China Academy of Traditional Chinese Medicine, Beijing 100700, China.
authors.forename: Yu-ping
authors.initials: YP
authors.lastname: Liu
authors.forename: Purusotam
authors.initials: P
authors.lastname: Basnet
authors.forename: Katsuko
authors.initials: K
authors.lastname: Komatsu
authors.forename: Hui
authors.initials: H
authors.lastname: Cao
mesh_terms: D001713:Biphenyl Compounds; D044950:Flavanones; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D016166:Free Radical Scavengers / Q000494:pharmacology; D005609:Free Radicals; D015394:Molecular Structure; D010851:Picrates; D018517:Plant Roots / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D011786:Quality Control; D031364:Scutellaria baicalensis / Q000737:chemistry*
chemical_list: D001713:Biphenyl Compounds; D044950:Flavanones; D005419:Flavonoids; D016166:Free Radical Scavengers; D005609:Free Radicals; D010851:Picrates; C038044:baicalin; C006680:baicalein; C004931:1,1-diphenyl-2-picrylhydrazyl