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  • Title: An NMR relaxation study of the state of water in gelatin gels.
    Author: Vackier MC, Hills BP, Rutledge DN.
    Journal: J Magn Reson; 1999 May; 138(1):36-42. PubMed ID: 10329223.
    Abstract:
    A combination of 1H and 23Na NMR is used to probe the dynamic state of water in gelatine gels as the water content is lowered from 70% to dryness. A sharp increase in the proton and sodium transverse relaxation rates is observed as the water content falls from 20 to 15% while the proton longitudinal and dipolar cross relaxation rates show a maximum at ca. 15%. We show that these observations can be understood if monolayer coverage occurs at 15% and multilayers of less strongly interacting hydration water are formed between 15 and 20%. Above 20% the water appears to behave as an unperturbed bulk phase.
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