Laser-raman spectra of d-glucose and sucrose in aqueous solution

Laser-Raman spectra of d-glucose in water at various concentrations were recorded below 1700 cm^?1. Assignments of the frequencies of d-glucose were proposed, based on earlier work on the vibrational spectra of this sugar, and determination by other techniques of the anomeric composition of aqueous solutions of d-glucose. The proportions of the anomers found from the ratio of the Raman intensities for the same models of vibrations were similar to those found by other techniques. Assignments of the frequencies for sucrose were proposed, in the light of previous results on d-glucose and d-fructose, and the effect, on their Raman spectra, of the condensation of these two monosaccharides was pointed out.