Abstract
NMR, X-ray and Rayleigh scattering of Mossbauer radiation (RSMR) measurements have been performed on agarose-water systems for different levels of water content. The NMR data provided information on the relaxation rates of protons in both polysaccharide and solvent. The RSMR measurement allowed us to determine the mean square atomic displacements as a function of the scattering vector. The values of carbon and oxygen atoms are larger when measured at distances corresponding to the helix diameter than along the chain bonds. At low hydration levels, the water molecules closely associated to the polysaccharide chains follow the dynamics of the polymer. A marked change in the dynamics of both polymer and water has been evidenced when the water weight exceeds 20% of the total weight of the sample.
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