Detection of water in the internal aqueous phase of W/O/W multiple emulsions using magic angle spinning proton NMR

Increased resolution in proton ( 1H) magic angle spinning (MAS) NMR spectra of emulsions is demonstrated. Relative volumes of the internal and external water phases of water-in-oil-in-water (W/O/W) type multiple emulsions were estimated by integration of water resonances separated by use of a shift...

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Bibliographic Details
Published in:Journal of colloid and interface science 1991-09, Vol.145 (2), p.466-477
Main Authors: Eads, Thomas M., Weiler, Robert K., Gaonkar, Anilkumar G.
Format: Article
Language:English
Subjects:
Chemistry
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
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Summary:Increased resolution in proton ( 1H) magic angle spinning (MAS) NMR spectra of emulsions is demonstrated. Relative volumes of the internal and external water phases of water-in-oil-in-water (W/O/W) type multiple emulsions were estimated by integration of water resonances separated by use of a shift reagent, while broadening due to magnetic susceptibility mismatch among phases was removed by magic angle sample spinning. Strategies are presented for reducing effects on sample integrity due to spinning and due to addition of reagents. Internal water may also be uniquely detected in the Carr-Purcell-Meiboom-Gill (CPMG) spin-echo spectrum of a sample containing added MnCl 2 as a relaxation reagent.
ISSN:0021-9797
1095-7103
DOI:10.1016/0021-9797(91)90378-L