Abstract
Recent studies of lipid bilayers and membranes by 13C NMR 1,2) have indicated the inherent advantages of this nucleus of a wide range of chemical shifts and relatively sharp resonances in systems of restricted molecular motion. The experiments summarised here demonstrate that information about the molecular motion of lipids in bilayers can be obtained by 13C NMR relaxation measurements, and that the T 1 relaxation times are characteristic of both the structure of the lipid and its steric interactions with other lipid molecules. Spectra can also be obtained from some membranes at natural abundance, or by specific 13C enrichment of membrane phospholipids through biosynthetic incorporation of labelled fatty acids.
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