Rapid discrimination of Panax notogeinseng of different grades by FT-IR and 2DCOS-IR

• Published in: Journal of molecular structure Vol. 1124; pp. 131 - 137
• Main Authors: Ma, Fang, Chen, Jian-bo, Wu, Xian-xue, Zhou, Qun, Sun, Su-qin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.11.2016
• Subjects: Fourier transform infrared spectroscopy (FT-IR); Identification; Panax notoginseng; The grade; Two-dimensional correlation infrared spectroscopy (2DCOS-IR); Panax notoginseng; Identification; The grade; Fourier transform infrared spectroscopy (FT-IR); Two-dimensional correlation infrared spectroscopy (2DCOS-IR)
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2016.02.087

The herbal material of Notoginseng (the root of Panax notoginseng) is sold by “Tou” (the number of Notoginseng in every 500 g) to distinguish the grade. Normally the better quality, the few number of the “Tou” and the size of Notoginseng is bigger. In this study, three grades of Notoginseng harvested from Yunnan province were discriminated and identified by Fourier transform infrared spectroscopy (FT-IR) and two-dimensional correlation infrared spectroscopy (2DCOS-IR)). The correlation coefficient of IR spectra between the three grades of Notoginseng and starch are greater than 0.95 in the range of 1300–800 cm−1, means the main compositions of Notoginseng are starch polysaccharide. Also, when the size of Notoginseng is bigger, it may contain more polysaccharide. There is no difference in range of 815–1000 cm−1 of the 2DCOS-IR synchronous spectra of the three grades means polysaccharides possess good thermal stability. In the range of 1200–1300 cm−1 shows the inverse ration between the thermal sensitivity of C–O and the number of “Tou”. Combination with the 2DCOS-IR asynchronous spectra, the response speed of amino acid (1640 cm−1) on the thermal perturbation is the fastest, followed by nitrate (1384 cm−1); the response speed of polysaccharides (1079 cm−1) is the slowest. The result proved that the 2DCOS-IR could discriminate different grades of Notoginseng. [Display omitted] •Three grades of Panax notoginseng are discriminated by FT-IR and 2DCOS-IR.•20T, 60T and 120T Notoginseng are studied as examples.•Characteristic peaks on FTIR spectra of these herbs were assigned.•The synchronous 2DCOS-IR shows thermal stability of the principal components of Notoginseng.•The asynchronous 2DCOS-IR shows the response speed on the thermal perturbation.