Author： Brown Michael Salmon Amir Henriksson Ulf Söderman Olle
Publisher： Taylor & Francis Ltd
ISSN： 1362-3028
Source： Molecular Physics, Vol.69, Iss.2, 1990-02, pp. : 379-383
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Abstract
Deuterium ( 2 H) N.M.R. spectroscopy has been used to investigate experimentally the molecular dynamics of phospholipid vesicles. 1,2-dimyristoyl- sn -glycero-3-phosphocholine (DMPC) was deuterated specifically in both acyl chains, and aqueous suspensions of vesicles were studied above the main orderdisorder transition temperature. 2 H spin-lattice relaxation rates ( R 1 ) were measured at nine different magnetic field strengths , corresponding to Larmor frequencies ( v o = &ohgr; o /2&pgr;) spanning 2·5 MHz to 61·4 MHz. Of three models considered, a model in which R 1 ∝ &ohgr; -1/2 0 best described the 2 H N.M.R. results, whereas fits to R 1 ∝ &ohgr; -1 0 or to a lorentzian plus a constant dispersion were less satisfactory. Thus a broad distribution of motions exists, which must be explained by any model for the N.M.R. relaxation of liquid-crystalline phospholipids.
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