Structure and water dynamics of aqueous peptide solutions in the presence of co-solvents.
- Author(s): Malardier-Jugroot, Cecile;
- Bowron, Daniel T;
- Soper, Alan K;
- Johnson, Margaret E;
- Head-Gordon, Teresa
- et al.
Published Web Locationhttps://doi.org/10.1039/b915346b
We perform neutron diffraction and quasi-elastic neutron scattering (QENS) to probe hydration water structure, and dynamics down to supercooled temperatures, of a concentrated amphiphilic peptide system with the co-solvents glycerol and dimethyl sulfoxide. We find that the kosmotropic co-solvent glycerol preserves the hydration structure near the peptide that is observed in the water solvent alone, that in turn preserves the dynamical temperature trends of two water relaxation processes--one corresponding to a localized relaxation process of the peptide bound surface water and a second relaxation process of the outer hydration layers. By contrast the chaotropic co-solvent, by disrupting the hydration layer near the peptide surface, eliminates the inner hydration layer relaxation process induced by the peptide, to show a single time scale for translational water dynamics.