Abstract
The spin-lattice 13C-NMR relaxation time T 1 of carbons in egg yolk phosphatidylcholine (EYPC) unilamellar liposomes was measured at 15 MHz, 25 MHz and 75 MHz in the presence of diamagnetic La 3+ and paramagnetic Gd 3+ ions. Supposing formation of ML 2 complexes (where M is the metal ion and L the lipid) and using a simplified Solomon-Bloembergen-Morgan equation, a value of 〈 r IS −3〉 2 = 0.1880 ± 0.0005 nm −6 was obtained for C ω carbon of lipid chains, where r IS is the distance of Gd 3+ unpaired electron and C ω nucleus, and angle brackets denote a weighted average. This value may serve as the basis for testing the application of statistical mechanics to lipid chain conformation and chain terminal group distribution in lipid bilayers.
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