Lipids spin-lattice relaxation times

Figure 14.1. Dependence of the spin-spin relaxation time (T2) and spin-lattice relaxation time (7)) on the motional correlation time xc. Approximate values of the expected line widths for small organic molecules, proteins, and lipids in a bilayer are indicated.

The effect of nitroxide spin-labeled lipids on 13C spin-lattice relaxation times of lecithin vesicles has been discussed (Levine et al.,... 

The involvement of free radicals in lipid peroxidation in the biological systems has been studied by ESR methods (9—11). The highly sensitive, non-invasive ESR oximetry method enables one to study early stages of lipid peroxidation by measuring oxygen uptake (12—17). ESR oximetry methods are based on bimolecular collisions of with spin labels that effectively shorten the spin-lattice relaxation time and lead to the broadening of the observed line width of the ESR signal. In addition, the lipid spin label enables the determination of membrane structure alteration with ESR techniques. 

The C spin-lattice relaxation times of the carbon atoms of certain 1,2-di-O-acyl-3-0-P-D-galactopyranosyl-and l,2-di-0-acyl-3-0-(6-0-a-D-galaclopyranosyl-p-D-galactopyranosyl)-sn-glycerols have been measured in [ Hjmethanol, [ H]-chlorofonn, and deuterium oxide with a view to understanding the role of chloro-plast lipids in the structure and the function of membranes. The -values were... 

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