title: [Dual-index sequence analytical method for IR fingerprint spectra of the chloroform extract of Radix Glycyrrhizae].
abstract: OBJECTIVE
  To investigate a new method for the analysis of IR fingerprint spectra of Radix Glycyrrhizae.
  
  
  METHODS
  Two indexes, common peak ratio and variation peak ratio, are used to compare the IR spectra of various Radix Glycyrrhizae samples, and the values are calculated by means of sequent analysis.
  
  
  CONCLUSIONS
  The dual-index sequence method provides a good approach to discriminate Radix Glycyrrhizae samples of different species and geographical origins.
authors.affiliation: School of Chemistry and Chemical Engineering of Shandong University(east campus), Jinan 250100, China. huabinzou@hotmail.com
authors.forename: Hua-Bin
authors.initials: HB
authors.lastname: Zou
authors.forename: Jiu-Rong
authors.initials: JR
authors.lastname: Yuan
authors.forename: Ai-Qin
authors.initials: AQ
authors.lastname: Du
authors.forename: Lin-Lin
authors.initials: LL
authors.lastname: Sn
mesh_terms: D002681:China; D004365:Drugs, Chinese Herbal / Q000032:analysis* / Q000302:isolation & purification; D017753:Ecosystem; D006035:Glycyrrhiza / Q000737:chemistry* / Q000145:classification; D010946:Plants, Medicinal / Q000737:chemistry*; D011786:Quality Control; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*
chemical_list: D004365:Drugs, Chinese Herbal