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<dc:title xml:lang="en">Development of a theranostic platform based on hyperbranched polymers grafted onto upconversion nanoparticles for the delivery of 5-fluorouracil</dc:title>
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<dcterms:abstract xml:lang="fr">La théranostique est un domaine de la biomédecine en plein essor qui combine le diagnostic et la thérapie en un même vecteur. L’approche développée lors de cette thèse combine les propriétés luminescentes des UCNPs et la capacité des polymères à encapsuler un principe actif de façon covalente ou non. Ce projet a conduit au développement et approfondissement de différentes compétences : 1) synthèse de nanocristaux de NaYF4:Yb3+,Er3+ dans des microtubes permettant de moduler la taille, la forme et la phase en fonction de différents paramètres opératoires, 2) la synthèse de nouveaux monomères et transmères en combinant la chimie organique et la synthèse peptidique en phase solide, 3) la préparation de polymères hyperramifiés par polymérisation radicalaire contrôlée de type RAFT depuis la surface des nanocristaux, 4) l’étude de l’encapsulation covalente et non covalente ainsi que le relargage de 5-fluorouracile et 5) l’étude de polymères répondant à un stimulus en terme de dégradation.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Theranostics is a growing field in biomedicine because of its ability to combine diagnosis and therapy in a single vector. The approach developed in this thesis combines the luminescent properties of UCNPs and the ability of polymers to encapsulate covalently or not a drug. This doctoral project led to the development and/or deepening of different skills: 1) synthesis of NaYF4:Yb3+,Er3+ nanocrystals in microtubes with tunable size, shape and phase according to different operating parameters, 2) synthesis of new monomers and transmers by combining organic chemistry and solid-phase peptide synthesis, 3) the preparation of hyperbranched polymers by controlled radical polymerization under RAFT conditions from the surface of nanocrystals, 4) the study of covalent and non-covalent encapsulation and the release of 5-fluorouracil and 5) the study of polymers responding to a stimulus in terms of degradation.</dcterms:abstract>
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