title: [Analysis and identification of Huangqi and its counterfeit ciguogancao by two dimensional corrlation infrared spectroscopy].
abstract: Standard Huangqi (Astragalus membranaceus (Fisch) Bge. Var. monghlicus (Bge.) Hsiao) and its counterfeit Ciguogancao (Glychrrhiza pallidiflora Maxim.) can be discriminated and identified by using multi-steps infrared maro--fingerprint method. In the 1D-IR spectra, the peak intensity at 1 737 cm(-1) for Ciguogancao, which is the stretching vibration peak of C==O, is much stronger than that of Huangqi. It's proved that the organic ester compounds in Ciguogancao are much more than Huangqi. In the secondary derivative spectra, it's easy to find the fingerprint characteristic peaks of CaC2O4 in the infrared spectra of Ciguogancao, but not in that of Huangqi. Besides, both secondary derivative spectra also have main characteristic peaks, which are the skeletal stretching of aromatic, round 1463, 1511 and 1596 cm(-1), but Ciguogancao aslo has one shoulder peak at 1 453 cm(-1). In the 2D-IR spectra, both have three auto-peaks at 1070, 1095 and 1140 cm(-1), which are the autopeaks of glucoside, but the strongest auto-peak of Huangqi is at 1140 cm(-1) and that of Ciguogancao's is at 1 090 cm(-1). The spectra testified that the organic ester compounds, aromatic compounds and glucoside compounds in Huangqi and its counterfeit Ciguogancao were different. The method not only can identify standard Huangqi and its counterfeit Ciguogancao rapidly, but also provides useful information about the differences in organic ester compounds, aromatic compounds and glucoside between Huangqi and its counterfeit Ciguogancao. It's proved that multi-steps infrared maro-fingerprint method can be used to analyze and distinguish Huangqi and its counterfeit Ciguogancao.
authors: College of Chemistry and Environmental Engineering, Shaoguan University, Shaoguan 512005, China. chk@sgu.edu.cn
authors: Dong-lan
authors: DL
authors: Huang
authors: Su-qin
authors: SQ
authors: Sun
authors: Yong-qun
authors: YQ
authors: Xu
authors: Xiao-kang
authors: XK
authors: Chen
mesh_terms: D027885:Astragalus propinquus; D058110:Counterfeit Drugs / Q000032:analysis*; D004365:Drugs, Chinese Herbal / Q000032:analysis*; D013055:Spectrophotometry, Infrared
chemical_list: D058110:Counterfeit Drugs; D004365:Drugs, Chinese Herbal; C027492:Huang Qi