title: [Determination of formononetin and calycasin from Radix Hedysari by HPLC].
abstract: OBJECTIVE
  To establish a method of RP-HPLC for the determination of formonontin and calycasin from Radix Hedysari.
  
  
  METHODS
  High-performance-liquid-chromatography (HPLC) on a Kromasil ODS column (5 microns, 4.6 mm x 250 mm) with water-methanol gradient elution, at column temperature of 25 degrees C, flow-rate of 1.0 ml/min and wavelength at 254 nm.
  
  
  RESULTS
  Linear ranges of formonontin and calycasin were 2.325 x 10(-3)-4.650 x 10(-2) micrograms and 2.350 x 10(-3)-4.700 x 10(-2) micrograms respectively. The average recoveries were 96.53% and 98.34% respectively, and relative standard deviations were 1.63% and 2.00%.
  
  
  CONCLUSIONS
  The method was simple, reliable, accurate and practical.
authors.affiliation: Lanzhou Medical College, Lanzhou 730000.
authors.forename: Fangdi
authors.initials: F
authors.lastname: Hu
authors.forename: Shilan
authors.initials: S
authors.lastname: Feng
authors.forename: Jianxiong
authors.initials: J
authors.lastname: Zhao
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods; D007887:Fabaceae / Q000737:chemistry*; D007529:Isoflavones / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D018517:Plant Roots / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*
chemical_list: D007529:Isoflavones; C007768:formononetin