[Study on the identification of Illicium vatum Hook. f. and illicium lanceolatum A. C. Smith by multi-ateps infrared...

Illicium vatum Hook. f. and its counterfeit Illicium lanceolatum A. C. Smith can be discriminated and identified by using multi-steps infrared maro-fingerprint method. The method combines three steps: general infrared spectroscopy (FTIR), secondary derivative spectroscopy and two dimensional correlation infrared spectroscopy (2D-IR). The resolution is getting higher and higher and the differences of spectra are magnified farther. The holistic shape of peaks is similar in the FTIR spectra of Illicium vatum Hook. f. and Illiciumrn lanceolatum A.C. Smith, but the spectra of llicium vatum Hook. f. show only one characteristic peak at 3 392 cm(-1), while the spectra of Illicium lanceolatum A. C. Smith show two characteristic peaks at 3482 and 3387 cm(-1), respectively. Observing their secondary derivative spectra, in the range of 850-1 180 cm(-1) the strongest peak of Ilicium vatum Hook. f. is at 1015 cm(-1) and the intensity of other strong peaks is similar. However, the strongest peak of Illicium lanceolatum A. C. Smith is at 1070 cm(-1). In 1180-1500 cm(-1), the intensity of peaks at 1469, 1454 and 1442 cm(-1) of Ilicium vatumrn Hook. f. is stronger than that of peaks at 1292, 1276, 1266 cm(-1). The status of Illicium lanceolatum A. C. Smith is just opposite. The distinction of 2D-IR correlation spectra is more obvious. In 1165-1500 cm(-1), the stronger automatic peaks of Ilicium vatum Hook. f. present at 1153 and 1000 cm(-1), respectively, but those of Illicium lanceolatum A. C. Smith present at 911 and 878 cm(-1), respectively. In 1165-1500 cm(-1), llicium vatum Hook. f. has two automatic peaks while Illicium lanceolatum A. C. Smith has five automatic peaks. The multi-steps IR macro-fingerprint method is rapid and effective.