Water mobility in multicomponent model media as studied by 2H and 17O NMR |
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| Authors: | Vittadini Elena Dickinson L Charles Lavoie James P Pham Xuyen Chinachoti Pavinee |
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| Institution: | Department of Food Science, University of Massachusetts, Amherst 01003, USA. |
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| Abstract: | Molecular mobility of water was studied in a microbiological media containing complex and heterogeneous mixtures of cellulose, l-sorbose, and orange serum broth (OSB) using (2)H and (17)O high-resolution NMR. All mixtures showed Lorentian (17)O NMR spectra but complex (2)H NMR line shapes. Sorbose, when solubilized, caused line-narrowing where as cellulose-OSB mixtures showed wide peaks with flat plateaus. Presence of liquid or solvent water had a profound effect on a marked increase in T(2) relaxation time observed in sorbose-containing samples. (17)O NMR data were not composition dependent, while (2)H NMR data were highly sorbose dependent. |
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