title: [Identification of Fritillaria herbal drugs by X-ray diffraction of starch grains].
abstract: OBJECTIVE
  To provide a simple method to identify different of herbal drugs of Fritillaria.
  
  
  METHODS
  The X-ray diffraction spectra of five Fritillaria powders were obtained by X-ray diffractometry (XRD).
  
  
  RESULTS
  By analyzing the diffraction peaks of starch over the 2theta diffraction angle in the range of 10 degrees-30 degrees, we concluded that the crystal type of starch in F. thunbergii, F. ussurensis, F. pallidifloca and F. hupehensis was B-type. However, the crystal type of starch in F. cirrhosa was CB-type. The degree of crystallinity of starch was 42.1%, 43.6%, 37.7%, 35.9% and 30.8%, corresponding to F. thunbergii, F. ussurensis, F. pallidiflcoca,F. cirrhosa and F. hupehensis.
  
  
  CONCLUSIONS
  Based on the differences of crystallinity of starch and X-ray diffraction spectra of Fritillaria powders, different species of Fritillaria can be identified.
authors.affiliation: The College of Pharmaceutical Science and Biotechnology, Tianjin University, Tianjin 300072, China.
authors.forename: Shu-Jun
authors.initials: SJ
authors.lastname: Wang
authors.forename: Wen-Yuan
authors.initials: WY
authors.lastname: Gao
authors.forename: Jiu-Gao
authors.initials: JG
authors.lastname: Yu
authors.forename: Pei-Gen
authors.initials: PG
authors.lastname: Xiao
mesh_terms: D003460:Crystallization; D031410:Fritillaria / Q000737:chemistry* / Q000145:classification; D018517:Plant Roots / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry* / Q000145:classification; D013045:Species Specificity; D013213:Starch / Q000032:analysis*; D014961:X-Ray Diffraction
chemical_list: D013213:Starch