FTIR and 2D-IR Spectroscopic Studies on Different Sources of Herbra Cistanche
XU Rong1, SUN Su-qin2, LIU You-gang3, CHEN Jun2*, LIU Tong-ning4, CHEN Shi-lin1
1. The Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, National Engineering Laboratory for Breedng of Endangered Medicinal Materials, Beijing 100193, China 2. Department of Chemistry, Tsinghua University, Beijing 100084, China 3. Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China 4. Yongning Plantation of Hebra Cistanche, Yinchuan 750010, China
Abstract:In the present paper, Fourier transform infrared spectroscopy (FTIR) associated with second derivative infrared spectroscopy and two-dimensional correlation spectroscopy (2D-IR) were used to analyze the 3 different sources of Hebra cistanche. The results showed that these IR spectra showed their different macro-fingerprint features: the charactersistic peaks of C. deserticola were located at ~1 730, 1 633, 1 156, 1 081, 1 025 and 931 cm-1 and those of C. tubulosa were at 1 692, 1 631, 1 604, 1 516, 1 265 and 1 023 cm-1, respectively. The only two peaks at ~1 151 and 1 085 cm-1 of C. salsa were different from that of C. deserticola. As a result, the IR spectrum of C. deserticola could be identified obviously from that of the C. tubulosa, whose similar index was only 0.623 3, but it was very similar to that of C. salsa, whose similar index was up to 0.904 8, demonstrating very similar ingredients. However, the difference between C. deserticola and C. salsa was obvious in the second derivative IR spectra: the shape of the two peaks of C. deserticola at ~1 730 and 816 cm-1 were much sharper. In addition, the fingerprint characters in 2D-IR spectra were more visualized. The three kinds of herbs were quite different from each other in the number and intensity of autopeaks. Therefore, FTIR macro-fingerprint method can identify different sources of Hebra cistance fast, nondestructively and effectively.
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