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<dc:title xml:lang="fr">Influence de composés perfluoroalkylés sur des films minces de phospholipides à une interface gaz/eau</dc:title>
<dcterms:alternative xml:lang="en">Influence of perfluoroalkyled compounds on thin films of phospholipids at the gas/water interface</dcterms:alternative>
<dc:subject xml:lang="fr">Fluorocarbure</dc:subject>
<dc:subject xml:lang="fr">Surfactant pulmonaire</dc:subject>
<dc:subject xml:lang="fr">Interface gaz /eau</dc:subject>
<dc:subject xml:lang="fr">Tension interfaciale</dc:subject>
<dc:subject xml:lang="fr">Oscillation périodique</dc:subject>
<dc:subject xml:lang="fr">Transition de phase LE/LC</dc:subject>
<dc:subject xml:lang="fr">Microbulle</dc:subject>
<dc:subject xml:lang="fr">Nanoparticule magnétique</dc:subject>
<dc:subject xml:lang="fr">Adsorption de phospholipide</dc:subject>
<dc:subject xml:lang="en">Fluorocarbon</dc:subject>
<dc:subject xml:lang="en">Pulmonary surfactant</dc:subject>
<dc:subject xml:lang="en">Gas/water interface</dc:subject>
<dc:subject xml:lang="en">Interfacial tension</dc:subject>
<dc:subject xml:lang="en">Periodical oscillation</dc:subject>
<dc:subject xml:lang="en">Phase transition LE / LC</dc:subject>
<dc:subject xml:lang="en">Microbubble</dc:subject>
<dc:subject xml:lang="en">Magnetic nanoparticle</dc:subject>
<dc:subject xml:lang="en">Phospholipid adsorption</dc:subject>
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<tef:elementdEntree autoriteExterne="031725562" autoriteSource="Sudoc">Hydrocarbures fluorés</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Les fluorocarbures ont un fort potentiel en médecine. Cependant, et en dépit du fait que certaines formulations employant des fluorocarbures sont utilisées en clinique, il n’existe que relativement peu d’études visant à déterminer les interactions entre un fluorocarbure et une membrane de phospholipides. Notre étude concentre à l’interface fluorocarbure/phospholipide, qui représente d’une part un modèle simplifié du surfactant pulmonaire natif dont le composant majoritaire est la dipalmitoylphosphatiylcholine (DPPC), et d’autre part la paroi de microbulles développées comme nouveaux agents théranostiques.Tout d’abord, nous montrons que les fluorocarbures abaissent considérablement la tension interfaciale d’équilibre d’une série de phospholipides et accélèrent fortement leur adsorption. Nous montrons que des oscillations périodiques appliquées à la bulle induisent une transition du film de DPPC vers un état d’organisation plus dense. L’application d’oscillations périodiques permet aussi à la DPPC d’expulser du film interfacial une protéine, l’albumine, dont la présence est souvent liée aux troubles dus au mauvais fonctionnement du surfactant pulmonaire. L’effet des fluorocarbures, qui accélère considérablement l’expulsion de l’albumine par la DPPC, est également étudié. D’autre part, nous avons obtenu des microbulles exceptionnellement stables grâce à une série homologue de phosphates perfluoroalkylés. Nous avons également réussi à former des microbulles couvertes par des nanoparticules magnétiques, tout en gardant les propriétés échogènes des bulles. De telles microbulles offrent un potentiel comme des agents de contraste bimodaux pour l’IRM et l’échosonographie.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Fluorocarbons have a great potential in medicine. However, and despite the fact that some formulations using fluorocarbons are used clinically, only a few studies are reported that aim to determining the interactions between a fluorocarbon and a membrane of phospholipids. Our work concentrated on the fluorocarbon/phospholipid interface, which represents, on one hand, a simplified model of the lung surfactant, the major component of which is dipalmitoylphosphatiylcholine (DPPC), and on the other hand, the shell of microbubbles developed as new theranostic agents. In a first part, we show that fluorocarbons significantly reduce the equilibrium interfacial tension of a series of phospholipids and greatly accelerate their adsorption rate. We also show that periodical oscillations applied to the bubble induce a transition of DPPC film to state with a denser organization. The application of periodical oscillations also allows DPPC to expel from the interfacial film a protein, albumin, whose presence is often associated with disorders caused by dysfunction of the lung surfactant. The impact of fluorocarbons, which considerably accelerate the expulsion from the interfacial film of albumin, is also studied. In a second part, we have obtained exceptionally stable microbubbles with a homologous series of perfluoroalkylated phosphates. We were also able to form microbubbles covered by magnetic nanoparticles, while preserving the echogenicity of the bubbles. Such microbubbles offer a potential as bimodal contrast agents for MRI and echography.</dcterms:abstract>
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