Hydration phenomena and diffusive behaviour in trehalose aqueous solutions

In this work the results obtained by means of ultrasonic, photon correlatio n spectroscopy, viscosity and Raman measurements on trehalose-water solutio ns, are presented. The ultrasonic data show that the mixing process is not ideal and that the water-trehalose interaction strength, because of the sat uration of II-bonds sites, decreases by increasing concentration. Furthermo re, the temperature behaviour of shear viscosity in a strong-fragile patter n, and the analysis of depolarized Raman scattering spectra, relative to th e supercooled region, evidence the noticeable kinetically fragile character of this system.