Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 357, Issue 2, Pages 655-663Publisher
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2010.07.035
Keywords
Deuteron NMR; Dielectric spectroscopy; Proteins; Water dynamics
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Using a combination of dielectric spectroscopy and solid-state deuteron NMR, the hydration water dynamics of connective tissue proteins is studied at sub-ambient temperatures. In this range, the water dynamics follows an Arrhenius law. A scaling analysis of dielectric losses, 'two-phase' NMR spectra, and spin-lattice relaxation times consistently yield evidence for a Gaussian distribution of energy barriers. With the dielectric data as input, random-walk simulations of a large-angle, water reorientation provide an approximate description of stimulated-echo data on hydrated elastin. This secondary process is quasi-isotropic and delocalized. The delocalization is inferred from previous NMR diffusometry experiments. It is emphasized that the phenomenology of this process is shared by many non-aqueous binary glasses in which the constituent components exhibit a sufficient dynamical contrast. (C) 2010 Published by Elsevier B.V.
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