Abstract
The rotational dynamics of water molecules in glucan solutions has been studied by 17ONMR relaxation. In a previous study the relaxation was interpreted using a two-phase model where anisotropic motion, induced in bound water by the surface of the solute molecule, was assumed. Anisotropic motion has not been confirmed by comparing the 17O relaxation with the 17O induced proton relaxation. Due to the different orientation of the principal axes of the relaxation mechanisms in the water molecule this is an excellent probe for anisotropic behaviour of the water molecule. Another model is proposed assuming fast exchange of water molecules between the bound phase and the free phase. For glucose a value for the exchange time of 2·7 ps and a hydration number of 7·2 have been found. For dextran these values are 2·6 ps and 6·6 respectively. The exchange times are of the order of the residence times as measured by quasi-elastic neutron scattering.
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