title: [Determination of ecdysterone in Achyranthes bidentata Bl. and its activity promoting proliferation of osteoblast-like cells].
abstract: OBJECTIVE
  To study the activity of ecdysterone from Achyranthes bidentata Bl. (AB) promoting proliferation of osteoblast-like (OB-like) UMR106 cells and to determine its content in AB by HPLC method.
  
  
  METHODS
  Ecdysterone isolated from AB was cultured with OB-like cells UMR106 together in vitro and the proliferation of OB-like cells was determined by MTT assay. The chromatographic conditions for determining ecdysterone included an ODS column (250 mm x 4.6 mm, 5 microns), a mobile phase consisting of a mixture of water-acetontrile-tetrahydrofuran (86:11:3), detection wavelength of 243 nm, and column temperature of 27 degrees C. Phenacetin was used as the internal standard.
  
  
  RESULTS
  The ecdysterone from AB had significant activity promoting proliferation of OB-like cells, the proliferation was promoted by 41% (n = 3). The average recovery of ecdysterone was 96.2% (RSD = 2.1%), the calibration was linear in the range of 30-300 micrograms.mL-1 (gamma = 0.9998).
  
  
  CONCLUSIONS
  Ecdysterone was screened quickly by cultivating with OB-like cells together in vitro. The HPLC method is accurate, fast and reproducible for the determination of ecdysterone in AB.
authors.affiliation: Shenyang Pharmaceutical University, Shenyang 110015, China.
authors.forename: X Y
authors.initials: XY
authors.lastname: Gao
authors.forename: D W
authors.initials: DW
authors.lastname: Wang
authors.forename: F M
authors.initials: FM
authors.lastname: Li
mesh_terms: D029044:Achyranthes / Q000737:chemistry*; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D002851:Chromatography, High Pressure Liquid; D004441:Ecdysterone / Q000302:isolation & purification / Q000494:pharmacology*; D010006:Osteoblasts / Q000166:cytology / Q000187:drug effects*
chemical_list: D004441:Ecdysterone