Analysis of Radix astragali and Its Water Extract by Infrared Spectroscopy

Infrared spectra changing rules of chemical components of Radix astragali original ingredients and its water extract were studied by Fourier transform infrared spectroscopy and second derivative infrared spectroscopy.The results showed that there was abundance of polyose components in Radix astragali water extract,and the residue of Radix astragali not only contained some substances including starch,cellulose and lignin,but also contained esters,ketones and aromatic,which was not easily soluble in water.The spectroscopic technique is a simple and rapid analytical technique,which could provide the valuable information about chemical constituents of medicinal extracts,thereby provide the effective references for the further analysis of chemical components and improvement on extraction-separation technology of traditional Chinese medicine.