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<dc:title xml:lang="fr">Conception et synthèse de fluorotensioactifs pour des applications en microfluidique en gouttes</dc:title>
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<dcterms:abstract xml:lang="fr">La microfluidique en gouttes offre d'importants avantages pour l'exploration de systèmes biologiques complexes. Dans la plupart des applications, des gouttes de phase aqueuse sont créées au sein d'une phase huileuse fluorée. Pour maintenir la stabilité de ces gouttes, des agents tensioactifs se positionnent à l'interface entre la phase huileuse et la phase aqueuse. Dans le cadre de cette thèse, la disposition des parties hydrophiles des tensioactifs a été exploitée pour fonctionnaliser la surface interne des gouttes, permettant ainsi la capture et la détection de composés présents à l’intérieur des gouttes. Tout d’abord des tensioactifs préalablement pré-fonctionnalisés avec des azotures, et capables de réagir au sein des gouttes via une réaction de SPAAC (cycloaddition azoture-alcyne tendu) avec des anticorps, ont été synthétisés. Puis, une fois le greffage d’anticorps optimisé, une nouvelle méthode d'immunoessai à la surface des gouttes par délocalisation de fluorescence a été développée. Enfin, les paramètres influençant la fonctionnalisation et la stabilisation des gouttes ont été examinés plus en détails.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Droplet-based microfluidic offers significant advantages for the exploration of complex biological systems. In most applications, droplets encapsulating an aqueous phase are produced within a fluorinated oil phase. To maintain the stability of the droplets, surfactants place themselves at the interface between the oil and the aqueous phases. In this thesis work, the position of the hydrophilic heads of the surfactants was leveraged to functionalize the internal surface of droplets, enabling the capture and detection of compounds present inside the droplets. Firstly, surfactant pre-functionalized with azides, and able to react within the droplets through a SPAAC (Strained Promoted Azide-Alkyne Cycloaddition) reaction with antibodies were synthetized. Then, once the antibodies grafting was optimized, a new method of immunoassay on the droplet surface via fluorescence delocalization was developed. Finally, the parameters influencing the functionalization and stabilization of the droplets were examined in more details.</dcterms:abstract>
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