[IR, Raman and DFT studies of Sudan red III and IV].

Infrared spectroscopy (IR) and normal Raman spectroscopy (NRS) of Sudan red(III) and Sudan red(IV), and surface -enhanced Raman spectroscopy(SERS) of them on Cu-Ag nanocomposite material were reported in the present paper. The density functional theory (DFT) calculation was applied to calculate IR and NRS on a B3LYP/6-311+G (d, p) level, and the theoretically calculated spectra were carefully compared with the obtained experimental spectra. The vibrational peaks were assigned by the software of Gauss view 5.0. Rapid identification of Sudan red was realized, which provided profitable basis for characteristics and quick test of Sudan dyes, and reliable detection method of food security.

[Study of the epimers of dexamethasone sodium phosphate and betamethasone sodium phosphate by FTIR, FT-Raman and SERS].

Abstract Infrared spectroscopy (FTIR), normal Raman spectroscopy (NRS) of the solids and saturated solutions and surface-enhanced Raman spectroscopy (SERS) on the silver colloidal substrate were reported. The vibrational modes of each group were analyzed, and the enhanced peaks were assigned and compared. The results showed that the major differences between the epimers were the frequency of the CH3 asymmetric stretching vibration and symmetric in-plane deformation vibration of them. According to the mechanism and laws of SERS, the epimers were absorbed on the silver colloid through the P-O bond, carboxyl group and the five-membered ring perpendicularly. The establishment of this adsorption model which realized the rapid identification and the discrimination between the epimers provided important information and useful reference of the adrenal cortical hormone drugs.