The Analyses and Identification of Flos Rhododendri Mollis and Flos Chrysanthemi Indici Via Infrared Spectroscopy
JIN Zhe-xiong1, WANG Yue1,2, ZHOU Qun2, CHEN Jian-bo2, MA Fang2, SUN Su-qin2*
1. Department of Traditional Chinese Pharmacy, Harbin University of Commerce, Harbin 150001, China 2. Department of Chemistry, Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Tsinghua University, Beijing 100084, China
Abstract：In this study, major chemical components of Flos rhododendri mollis and Flos chrysanthemi indici were characterized using Fourier transform infrared spectroscopy (FTIR). For Flos rhododendri mollis, the bands at 1 648 and 1 543 cm-1 were attributed to amide Ⅰ and amide Ⅱ, respectively, indicating that it contained proteins probably resulting in immunization. In case of Flos chrysanthemi indici, stretching vibration of CO function group was responsible for the bands at 1 734 and 1 515 cm-1, as a result of essential oils, lipids, etc. Since FTIR spectra of Flos rhododendri mollis and Flos chrysanthemi indici are almost identical and it is difficult to discriminate them, two-step identification was investigated via secondary derivative of the FTIR spectra. The bands at 1 656 and 1 515 cm-1 corresponds to flavonoides in Flos rhododendri mollis and Flos chrysanthemi indici. In the secondary derivative of the FTIR spectrum of Flos chrysanthemi indici, characteristic bands of inulin were present at 1 163, 1 077, 1 026, 986 and 869 cm-1, and therefore Flos chrysanthemi indici contained inulin as well. Tri-step identification was carried out for Flos rhododendri mollis and Flos chrysanthemi indici by means of comparing their 2D-IR correlation spectra in different wave number range. In the characteristic range of flavonoides (1 700~1 400 cm-1), Flos rhododendri mollis exhibited 3 obvious autopeaks, while 10 autopeaks were visualized in the 2D-IR correlation spectrum of Flos chrysanthemi indici Moreover, in the characteristic range of glucoside (1 250~900 cm-1), 10 and 9 autopeaks were present in the 2D-IR correlation spectra of Flos rhododendri mollis and Flos chrysanthemi indici, respectively. Therefore, the tri-step identification of FTIR is a time-saving, accurate, cost-saving and convenient method to effectively distinguish traditional Chinese medicines.
Key words：Flos rhododendri mollis;Flos chrysanthemi indici;FTIR;secondary derivative of the FTIR;2D-IR
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