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Temperature Variation of Lipid Membrane Structure and the Hydration Force in Fluid Lamellar Phase: Experimental Studies with Dimyristoylphosphatidylcholine Multibilayers

Results of X-ray small-angle scattering experiments with dimyristoylphosphatidylcholine multibilayers show that the lipid packing parameters in such a system have an anomalous temperature dependence. Critical fluctuations in the lipid membranes cause the lamellar repeat distance and membrane thickness to decrease with the relative temperature approximately as (T - Tm)-1, up to approximately 10 degrees above the lipid chain-melting transition temperature. Above 40 °C and especially above 70 °C the interlamellar water layer thickness starts to increase non-linearly, however. This is probably due to the temperature-induced swelling of the interfacial region which goes along with enhanced lipid headgroup fluctuations and gives rise to anomalously strong “hydration force” at high temperatures.