Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2010-05-28
Physics
Condensed Matter
Soft Condensed Matter
14 pages, 4 figures, accepted in Journal of Non-Crystalline Solids (proceedings of the conference IDMRCS6)
Scientific paper
The dynamics of water in aqueous solutions of three homologous disaccharides, namely trehalose, maltose and sucrose, has been analyzed by means of molecular dynamics simulations in the 0-66 wt % concentration range. The low-frequency vibrational densities of states (VDOS) of water were compared with the susceptibilities chi" of 0-40 wt % solutions of trehalose in D2O obtained from complementary Raman scattering experiments. Both reveal that sugars significantly stiffen the local environments experienced by water. Accordingly, its translational diffusion coefficient decreases when the sugar concentration increases, as a result of an increase of water-water hydrogen bonds lifetimes and of the corresponding activation energies. This induced slowing down of water dynamics, ascribed to the numerous hydrogen bonds that sugars form with water, is strongly amplified at concentrations above 40 wt % by the percolation of the hydrogen bond network of sugars, and may partially explain their well-known stabilizing effect on proteins in aqueous solutions.
Affouard Frederic
Bordat Patrice
Descamps Marc
Guinet Yannick
Hedoux Alain
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