title: [Identification of Dens Draconis and Os Draconis by XRD method].
abstract: OBJECTIVE
  To establish an XRD method for evaluating the quality of Os Draconis and Dens Draconis and applying in judgement of the counterfeit.
  
  
  METHODS
  Dens Draconis, Os Draconis and the counterfeit of Os Draconis were analyzed by XRD. Their diffraction patterns were clustered analysis and evaluated their similarity degree.
  
  
  RESULTS
  Established the analytical method of Dens Draconis and Os Draconis basing the features fingerprint information of the 10 common peaks by XRD pattern. Obtained the XRD pattern of the counterfeit of Os Draconis. The similarity degree of separate sources of Dens Draconis was high,while the similarity degree of separate sources of Os Draconis was significant different from each other.
  
  
  CONCLUSIONS
  This method can be used for identification and evaluation of Os Draconis and Dens Draconis. It also can be used for identification the counterfeit of Os Draconis effectively.
authors.affiliation: Nanjing University of TCM, Nanjing 210046, China. xrays1987@163.com
authors.forename: Guang-Yun
authors.initials: GY
authors.lastname: Chen
authors.forename: Qi-Nan
authors.initials: QN
authors.lastname: Wu
authors.forename: Bei
authors.initials: B
authors.lastname: Shen
authors.forename: Rong
authors.initials: R
authors.lastname: Chen
mesh_terms: D000818:Animals; D001842:Bone and Bones; D058110:Counterfeit Drugs / Q000737:chemistry; D005580:Fossils; D008419:Materia Medica / Q000737:chemistry* / Q000592:standards; D008516:Medicine, Chinese Traditional; D011208:Powders; D011786:Quality Control; D014961:X-Ray Diffraction
chemical_list: D058110:Counterfeit Drugs; D008419:Materia Medica; D011208:Powders