Molecular motions in lipid bilayers studied by the neutron backscattering technique

Details Molecular motions in lipid bilayers studied by the neutron backscattering technique Molecular motions in lipid bilayers studied by the neutron backscattering technique

2005-01-31

arxiv.org/abs/cond-mat/0501752v2

Phys. Rev. E 71, 061908 (2005)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevE.71.061908

We report a high energy-resolution neutron backscattering study to investigate slow motions on nanosecond time scales in highly oriented solid supported phospholipid bilayers of the model system DMPC -d54 (deuterated 1,2-dimyristoyl-sn-glycero-3-phoshatidylcholine), hydrated with heavy water. This technique allows to discriminate the onset of mobility at different length scales for the different molecular components, as e.g.\@ the lipid acyl-chains and the hydration water in between the membrane stacks, respectively, and provides a benchmark test regarding the feasibility of neutron backscattering investigations on these sample systems. We discuss freezing of the lipid acyl-chains, as observed by this technique, and observe a second freezing transition which we attribute to the hydration water.

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