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An NMR Relaxation Study of the State of Water in Gelatin Gels

✍ Scribed by Marie-Claire Vackier; Brian P. Hills; Douglas N. Rutledge

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 121 KB
Volume: 138
Category: Article
ISSN: 1090-7807
DOI: 10.1006/jmre.1999.1730

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✦ Synopsis

A combination of 1 H and 23 Na 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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