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Water activity in lamellar stacks of lipid bilayers: "Hydration forces" revisited.
Leite Rubim, R; Gerbelli, B B; Bougis, K; Pinto de Oliveira, C L; Navailles, L; Nallet, F; Andreoli de Oliveira, E.
Afiliación
  • Leite Rubim R; Instituto de Física-GFCx, Universidade de São Paulo, P.O.B. 66318, SP 05314-970, São Paulo, Brazil.
  • Gerbelli BB; Centre de recherche Paul-Pascal-CNRS, Université de Bordeaux, 115 avenue du Docteur-Schweitzer, F-33600, Pessac, France.
  • Bougis K; Instituto de Física-GFCx, Universidade de São Paulo, P.O.B. 66318, SP 05314-970, São Paulo, Brazil.
  • Pinto de Oliveira CL; Instituto de Física-GFCx, Universidade de São Paulo, P.O.B. 66318, SP 05314-970, São Paulo, Brazil.
  • Navailles L; Centre de recherche Paul-Pascal-CNRS, Université de Bordeaux, 115 avenue du Docteur-Schweitzer, F-33600, Pessac, France.
  • Nallet F; Instituto de Física-GFCx, Universidade de São Paulo, P.O.B. 66318, SP 05314-970, São Paulo, Brazil.
  • Andreoli de Oliveira E; Centre de recherche Paul-Pascal-CNRS, Université de Bordeaux, 115 avenue du Docteur-Schweitzer, F-33600, Pessac, France.
Eur Phys J E Soft Matter ; 39(1): 3, 2016 Jan.
Article en En | MEDLINE | ID: mdl-26794503
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 small-angle 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".
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Termodinámica / Interacciones Hidrofóbicas e Hidrofílicas / Membrana Dobles de Lípidos Idioma: En Revista: Eur Phys J E Soft Matter Asunto de la revista: BIOFISICA Año: 2016 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Francia
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Termodinámica / Interacciones Hidrofóbicas e Hidrofílicas / Membrana Dobles de Lípidos Idioma: En Revista: Eur Phys J E Soft Matter Asunto de la revista: BIOFISICA Año: 2016 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Francia