3 research outputs found

    Fluorinated/hydrogenated double-chain hybrid amphiphilic molecules : synthesis, dynamic of auto-association study and application to hydrophobic drugs transport

    No full text
    Ces travaux de thĂšse portent sur la conception de systĂšmes amphiphiles provenant de l’auto-association de nouveaux tensioactifs hybrides non ioniques fluorocarbonĂ©s–hydrocarbonĂ©s (F–H) Ă  tĂȘte polaire PEGylĂ©e ou glucosylĂ©e. Ces tensioactifs sont capables de former diffĂ©rents types d’agrĂ©gats dans l’eau (micelles et vĂ©sicules) et pourraient servir pour l’encapsulation et la vectorisation de principes actifs hydrophobes.Nous avons mis au point une synthĂšse multi-Ă©tapes modulable d’un fragment hybride F–H Ă  motif sĂ©rine qui est ensuite greffĂ© Ă  une tĂȘte polaire par rĂ©action de chimie click, pour conduire aux tensioactifs hybrides F–H. Une Ă©tude dĂ©taillĂ©e de leurs propriĂ©tĂ©s d’auto-assemblage (i.e. cmc, nombre d’agrĂ©gation, taille et stabilitĂ© des agrĂ©gats) a Ă©tĂ© rĂ©alisĂ©e et a permis de prĂ©ciser l’influence de la longueur des chaĂźnes hydrophobes F–H et de la nature des tĂȘtes hydrophiles greffĂ©es (Glucose, PEGs) sur l’auto-association des tensioactifs. Ces rĂ©sultats permettent une meilleure comprĂ©hension de la physico-chimie des agrĂ©gats qui permettra par la suite la sĂ©lection du (des) meilleur(s) candidat(s) pour une future encapsulation de principes actifs.Enfin, des essais prĂ©liminaires d’encapsulation du Paclitaxel (PTX), un agent anti cancĂ©reux hydrophobe, ont Ă©tĂ© menĂ©s Ă  l’aide d’un tensioactif candidat hybride PEGylĂ©e F8. MalgrĂ© de faibles doses de PTX encapsulĂ©es et un effet de burst-release rapide, des tests de viabilitĂ© cellulaire sur des lignĂ©es cancĂ©reuses pulmonaires, ont permis de mettre en Ă©vidence le caractĂšre biocompatible du vecteur seul et la conservation de l’activitĂ© pharmacologique du PTX dans la formulation micellaire.This thesis focused on the design of amphiphilic systems resulting from the self-association of new hybrid nonionic fluorinated/hydrogenated surfactants with a PEGylated or a glucose polar head. In water, these surfactants were found to form different types of stable aggregates, micelles for the PEG series and vesicles for the Glucose series, and thus could be used for the encapsulation and vectorization of hydrophobic drugs. We developed a versatile multi-step synthesis of an hybrid building block with a serine core which was then grafted to a polar head by a copper(I)-mediated azide-alkyne cycloaddition (CuAAC) reaction to lead to the F–H hybrid surfactants. A thorough study of their self-assembly properties i.e. cmc, aggregation number, size and stability of the aggregates was carried out. We demonstrated that subtle changes in the chemical structure can change the nature and the size of the aggregates with the F6 PEG series forming rather small and compact micelles, those of the F8 PEG being larger and likely well-defined while the two Glucose compounds form vesicles. Finally, preliminary encapsulation trials of Paclitaxel (PTX), an hydrophobic chemotherapeutic agent, were carried out using a hybrid PEGylated surfactant from the F8 series. Despite low drug-loading and rapid burst-release, cell viability tests on pulmonary cancer lines showed that PEGylated F8 alone is biocompatible and that PEGylated F8/PTX formulation does not inhibit the activity of PTX in the micellar formulation

    Molécules amphiphiles hybrides à chaines hydrogénées et fluorées : synthÚse, étude de la dynamique d'auto-association et application au transport de principes actifs hydrophobes

    No full text
    This thesis focused on the design of amphiphilic systems resulting from the self-association of new hybrid nonionic fluorinated/hydrogenated surfactants with a PEGylated or a glucose polar head. In water, these surfactants were found to form different types of stable aggregates, micelles for the PEG series and vesicles for the Glucose series, and thus could be used for the encapsulation and vectorization of hydrophobic drugs. We developed a versatile multi-step synthesis of an hybrid building block with a serine core which was then grafted to a polar head by a copper(I)-mediated azide-alkyne cycloaddition (CuAAC) reaction to lead to the F–H hybrid surfactants. A thorough study of their self-assembly properties i.e. cmc, aggregation number, size and stability of the aggregates was carried out. We demonstrated that subtle changes in the chemical structure can change the nature and the size of the aggregates with the F6 PEG series forming rather small and compact micelles, those of the F8 PEG being larger and likely well-defined while the two Glucose compounds form vesicles. Finally, preliminary encapsulation trials of Paclitaxel (PTX), an hydrophobic chemotherapeutic agent, were carried out using a hybrid PEGylated surfactant from the F8 series. Despite low drug-loading and rapid burst-release, cell viability tests on pulmonary cancer lines showed that PEGylated F8 alone is biocompatible and that PEGylated F8/PTX formulation does not inhibit the activity of PTX in the micellar formulation.Ces travaux de thĂšse portent sur la conception de systĂšmes amphiphiles provenant de l’auto-association de nouveaux tensioactifs hybrides non ioniques fluorocarbonĂ©s–hydrocarbonĂ©s (F–H) Ă  tĂȘte polaire PEGylĂ©e ou glucosylĂ©e. Ces tensioactifs sont capables de former diffĂ©rents types d’agrĂ©gats dans l’eau (micelles et vĂ©sicules) et pourraient servir pour l’encapsulation et la vectorisation de principes actifs hydrophobes.Nous avons mis au point une synthĂšse multi-Ă©tapes modulable d’un fragment hybride F–H Ă  motif sĂ©rine qui est ensuite greffĂ© Ă  une tĂȘte polaire par rĂ©action de chimie click, pour conduire aux tensioactifs hybrides F–H. Une Ă©tude dĂ©taillĂ©e de leurs propriĂ©tĂ©s d’auto-assemblage (i.e. cmc, nombre d’agrĂ©gation, taille et stabilitĂ© des agrĂ©gats) a Ă©tĂ© rĂ©alisĂ©e et a permis de prĂ©ciser l’influence de la longueur des chaĂźnes hydrophobes F–H et de la nature des tĂȘtes hydrophiles greffĂ©es (Glucose, PEGs) sur l’auto-association des tensioactifs. Ces rĂ©sultats permettent une meilleure comprĂ©hension de la physico-chimie des agrĂ©gats qui permettra par la suite la sĂ©lection du (des) meilleur(s) candidat(s) pour une future encapsulation de principes actifs.Enfin, des essais prĂ©liminaires d’encapsulation du Paclitaxel (PTX), un agent anti cancĂ©reux hydrophobe, ont Ă©tĂ© menĂ©s Ă  l’aide d’un tensioactif candidat hybride PEGylĂ©e F8. MalgrĂ© de faibles doses de PTX encapsulĂ©es et un effet de burst-release rapide, des tests de viabilitĂ© cellulaire sur des lignĂ©es cancĂ©reuses pulmonaires, ont permis de mettre en Ă©vidence le caractĂšre biocompatible du vecteur seul et la conservation de l’activitĂ© pharmacologique du PTX dans la formulation micellaire
    corecore