Skip to main content
eScholarship
Open Access Publications from the University of California

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 Location

https://doi.org/10.1039/b915346b
Abstract

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.

Many UC-authored scholarly publications are freely available on this site because of the UC's open access policies. Let us know how this access is important for you.

Main Content
Current View