Analysis of fingerprints features of infrared spectra of various processed products of Radix Aconiti kusnezoffii

Abstract Fourier-transform infrared spectroscopy (FTIR) and two-dimensional correlation infrared spectroscopy (2D-IR)) are employed to analyze various processed products and ether extracts of Radix Aconiti kusnezoffii . There is a resemblance among the spectra of different processed products. The major difference lies in the absorption peak at 1641 cm −1 in the IR spectra, which reflects the transformation of raw aconite to the processed products. There are distinctive differences in the absorption peaks in the range of 1800–1500 cm −1 in the second derivative spectra, which has better resolution, of different processed products. 2D-IR spectra, which elevate the resolution further, can present even more differences among the products in the range of 1800–800 cm −1 . Analysis of ether extracts of various processed products proves that there are alcohols, esters, carboxylic acids or ketones in all of them. However, their contents in different samples have obvious differences. With the advantages of high resolution, high-speed and convenience, IR can quickly and precisely distinguish various processed products of Radix A. kusnezoffii , and can be applied to predict the tendency of transformation of the complicated chemical mixture systems under heat perturbation.