Magnetic resonance studies on membrane and model membrane systems. III. Fatty acid motions in aqueous lecithin dispersions

Alan F. Horwitz*, Daniel Michaelson, Melvi P. Klein

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Magnetic resonance spectra and relaxation rates of sonicated and unsonicated vesicles of egg yolk lecithin are reviewed and compared. The NMR relaxation rates differ by about two orders of magnitude while the ESR order parameters show no such variation. The apparent contradiction may be removed by proposing that the ESR data reflect the order of segments of the fatty acids while the NMR relaxation rates reflect positional fluctuations. Macroscopic vesicular tumbling contributes insignificantly to the relaxation rates. Resonance and non-resonance data converge on a dynamic model in which the fatty acid molecules are configurationally mobile yet relatively ordered.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalBBA - Biomembranes
Volume298
Issue number1
DOIs
StatePublished - 27 Feb 1973
Externally publishedYes

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