title: [Study on quality standard of Rhizoma Diosoreae and Rhizoma Dioscorea stir-baked with bran].
abstract: OBJECTIVE
  To perfect the current standard of Rhizoma Diosoreae and Rhizoma Diosoreae stir-baked with bran by improving quality standards of the two processed pieces.
  
  
  METHODS
  The quality standards were established according to 9 batches of processed pieces, separately. The standards contains items of identification, water, total ash, acid-insoluble ash, extractives, heavy metals limit, organochlorine limit, microbial limit and assay.
  
  
  RESULTS
  The TLC of the two pieces was characteristed. The contents of acid-insoluble ash in the two pieces were increased, not more than 0.5%, 0.3%, respectively. The content limits of five kinds of heavy metals and harmful elements, two kinds of residual organochlorine pesticides and three microbial limits were increased. There were no more than 2 x 10(-7) of lead, 2 x 10(-7) of cadmium, 1 x 10(-5) of copper, 3 x 10(-7) of arsenic, 1 x 10(-7) of mercury, 1 x 10(-7) of hexachlorocyclohexane (BHC) and 1 x 10(-7) of chlorophenothane (DDT) in the two processed pieces, respectively. There were no more than 2 000 and 600 cfu x mL(-1) in the two pieces, respectively and no more than 30 MPN x 100 g(-1) and fungi can not be tested in the two pieces. The contents of allantoin in the two pieces were no more than 0.15%.
  
  
  CONCLUSIONS
  This method is simple and suitable for the quality control of the two processed pieces.
authors.affiliation: Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China.
authors.forename: Lianju
authors.initials: L
authors.lastname: Yang
authors.forename: Xuefeng
authors.initials: X
authors.lastname: Feng
authors.forename: Jingyu
authors.initials: J
authors.lastname: Yang
authors.forename: Shuyun
authors.initials: S
authors.lastname: Zhang
authors.forename: Fangfang
authors.initials: F
authors.lastname: Jia
authors.forename: Xiaoguang
authors.initials: X
authors.lastname: Ge
mesh_terms: D002626:Chemistry, Pharmaceutical / Q000379:methods* / Q000592:standards; D002855:Chromatography, Thin Layer; D027742:Dioscorea / Q000737:chemistry*; D011786:Quality Control; D027343:Rhizome / Q000737:chemistry*