Abstract
We report bending elastic coefficients and spontaneous radii of lipid monolayer curvature for a series of phosphatidylethanolamines (PE) with mono- and polyunsaturated hydrocarbon chains. Monolayer curvature in the inverse hexagonal (HII) phase was altered by osmotic stress exerted by polyethylene glycol solutions. Water content was measured by 1H-MAS-NMR and monolayer radii measured by x-ray diffraction. Interestingly, curvature elastic properties of lipid monolayers composed of PE with two oleic acid chains (DOPE) are very close to properties of mixed-chain PEs with a saturated stearoyl chain at sn-1 and a polyunsaturated docosahexaenoyl (22:6n-3) or docosapentaenoyl (22:5n-6) chain at sn-2.
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