Sterols sense swelling in lipid bilayers

Details Sterols sense swelling in lipid bilayers Sterols sense swelling in lipid bilayers

1998-12-24

arxiv.org/abs/cond-mat/9812390v1

Physics

Condensed Matter

Soft Condensed Matter

11 pages, 7 ps figures included, to appear in Phys.Rev.E

Scientific paper

10.1103/PhysRevE.59.3483

In the mimetic membrane system of phosphatidylcholine bilayers, thickening (pre-critical behavior, anomalous swelling) of the bilayers is observed, in the vicinity of the main transition, which is non-linear with temperature. The sterols cholesterol and androsten are used as sensors in a time-resolved simultaneous small- and wide angle x-ray diffraction study to investigate the cause of the thickening. We observe precritical behavior in the pure lipid system, as well as with sterol concentrations less than 15%. To describe the precritical behavior we introduce a theory of precritical phenomena.The good temperature resolution of the data shows that a theory of the influence of fluctuations needs modification. The main cause of the critical behavior appears to be a changing hydration of the bilayer.

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