title: [Study on density quality control of crude pyritum].
abstract: OBJECTIVE
  To establish the quality assessment method of crude pyritum.
  
  
  METHODS
  The correlations of methods of modern and traditional quality appraisement with density for crude pyritum were investigated.
  
  
  RESULTS
  Appraisement of crude pyritum using density as an evaluation index was in accordance with its traditional quality appraisement method. The density had extremely significant positive correlation with FeS2 content contained in crude pyritum (r = 0.990, P<0.001) and became smaller with the decreasing of FeS2 content. Meantime the density also had extremely significant negative correlation with total ferrum content contained in crude pyritum (r = -0.971, P<0.001) and became smaller with the increasing of total ferrum content.
  
  
  CONCLUSIONS
  It's feasible to take density as evaluation index for quality control of crude pyritum, and the testing method established is simple and convenient.
authors.affiliation: Jiangsu Key Laboratory of Chinese Medicine Processing, Nanjing University of Chinese Medicine, Nanjing 210029, China. hongbin116@yahoo.com.cn
authors.forename: Hongbin
authors.initials: H
authors.lastname: Wang
authors.forename: Jieming
authors.initials: J
authors.lastname: Xiao
authors.forename: Hao
authors.initials: H
authors.lastname: Cai
authors.forename: Baochang
authors.initials: B
authors.lastname: Cai
mesh_terms: D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D008419:Materia Medica / Q000737:chemistry*; D011786:Quality Control
chemical_list: D004365:Drugs, Chinese Herbal; D008419:Materia Medica