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Article Dans Une Revue European Physical Journal E: Soft matter and biological physics Année : 2016

Water activity in lamellar stacks of lipid bilayers: “Hydration forces” revisited

Résumé

Water activity and its relationship with interactions stabilising lamellar stacks of mixed lipid bilayers in their fluid state are investigated by means of osmotic pressure measurements coupled with smallangle X-ray scattering. The (electrically neutral) bilayers are composed of a mixture in various proportions of lecithin, a zwitterionic phospholipid, and Simulsol, a non-ionic cosurfactant with an ethoxylated polar head. For highly dehydrated samples the osmotic pressure profile always exhibits the “classical” exponential decay as hydration increases but, depending on Simulsol to lecithin ratio, it becomes either of the “bound” or “unbound” types for more water-swollen systems. A simple thermodynamic model is used for interpreting the results without resorting to the celebrated but elusive “hydration forces”.

Dates et versions

hal-01350032 , version 1 (29-07-2016)

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Citer

R. Leite Rubim, B.B. Gerbelli, K. Bougis, C.L. Pinto De Oliveira, L. Navailles, et al.. Water activity in lamellar stacks of lipid bilayers: “Hydration forces” revisited. European Physical Journal E: Soft matter and biological physics, 2016, 39 (3), pp. 1-11. ⟨10.1140/epje/i2016-16003-0⟩. ⟨hal-01350032⟩

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