Abstract
Multilayer membranes of DPPC (l,2–dipalmitoyl–sn–glycero–3–phosphatidylcholine) and mixture DPPC/POPC (1–palmitoyl–2–oleoyl–sn–glycero–3–phosphatidylcholine) in excess of water were investigated by small angle X–ray scattering and neutron small angle scattering. Structural parameters of lipid bilayers were determined in a wide temperature range. It was shown that addition of the POPC to the DPPC/H2O does not change the temperature of the DPPC main phase transition Tm. The observed phase separation occurs for the system DPPC/POPC/H2O up to the pre-transition temperature Tr (gel phase – ripple phase) of the DPPC multilayers.
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