Structural Transition in a Lipid−Water Liquid System
DOI:
https://doi.org/10.15407/ujpe57.6.623Keywords:
-Abstract
Small-angle X-ray scattering technique has been used to study multilayer lipid membranes of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) and the
3:1-mixture DPPC/1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) in excess water. The temperature dependences of the repetition period for lipid bilayers in the temperature range 20–55 ºС are obtained. A comparative analysis of the scattering curves obtained for multilayer membranes showed that,
below a temperature of 40 ºС, there emerges an additional ordering with a repetition period of 66 Å in the lipid mixture, which we associate with the lipid phase separation. A disappearance of the so-called ripple (wave-like) phase of DPPC lipid in the mixture is also observed.
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