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<dc:title xml:lang="fr">Synthèse de complexes luminescents à base d'ions lanthanides pour le marquage de biomolécules : application au diagnostic de la maladie d'Alzheimer</dc:title>
<dcterms:alternative xml:lang="en">Synthesis of luminescent lanthanide complexes for labeling biomolecules : application to Alzheimer's disease diagnosis</dcterms:alternative>
<dc:subject xml:lang="fr">Lanthanide</dc:subject>
<dc:subject xml:lang="fr">FRET</dc:subject>
<dc:subject xml:lang="fr">Luminescence</dc:subject>
<dc:subject xml:lang="fr">Maladie d'Alzheimer</dc:subject>
<dc:subject xml:lang="fr">Antenne</dc:subject>
<dc:subject xml:lang="fr">Nanocristaux</dc:subject>
<dc:subject xml:lang="fr">Phosphonate</dc:subject>
<dc:subject xml:lang="fr">Streptavidine</dc:subject>
<dc:subject xml:lang="en">Lanthanide</dc:subject>
<dc:subject xml:lang="en">FRET</dc:subject>
<dc:subject xml:lang="en">Alzheimer disease</dc:subject>
<dc:subject xml:lang="en">Quantum dots</dc:subject>
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<tef:elementdEntree autoriteExterne="03206280X" autoriteSource="Sudoc">Métaux des terres rares</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="02765284X" autoriteSource="Sudoc">Maladie d'Alzheimer</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Ce travail de thèse visait la conception de marqueurs à base d’ions lanthanides pour le diagnosticprécoce de la maladie d’Alzheimer, à travers un transfert d’énergie avec des nanocristaux semi- conducteurs luminescents. Notre choix s’est porté sur des ligands polyaminophosphonatés de type pyridine-bis-pyrazolyl rendus réactifs vis-à-vis des biomolécules par la présence de groupements activés. Nous présentons la synthèse d’un ligand modèle incorporant seulement l’unité de photosensibilisation tridentate et des groupes phosphonatés. À partir de ce ligand, les complexes d’europium et de terbium synthétisés ont été caractérisés. Une grande stabilité et des propriétés de luminescence avantageuses ont été mises en évidence par nos études, notamment en ce qui concerne le complexe de terbium. Une méthode synthèse de ligands de ce type, fonctionnalisés par la présence de groupements réactifs a été développée et le marquage de biomolécules dont des marqueurs de la maladie d’Alzheimer a été réalisé avec succès. La synthèse d’un autre ligand phosphonaté associé de façon covalente à la biotine et l’utilisation de son complexe de terbium comme donneur d’énergie a permis de réaliser des expériences de transfert d’énergie avec divers accepteurs luminescents dont des nanocristaux semi-conducteurs.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This work aimed at the design of markers with lanthanides ions for the early diagnosis of the Alzheimer's disease, through an energy transfer with luminescent quantum dots. Our choice focused on polyaminophosphonated ligands bearing a pyridine-bis-pyrazolyl moiety and made reactive towards biomolecules by the presence of activated groups. We present in the synthesis of a model ligand incorporating only the tridentate photosenstization unit and phosphonate moieties. From this ligand, europium and terbium complexes have been synthesized and characterized. An important stability and advantageous luminescence properties were revealed by our studies, especially for the terbium complex.Then a method of synthesis of ligands of this type, functionalized by the presence of reactive groups was developed and labeling experiments were carried aout with several biomolecules amoung which some Alzheimer’s disease biomarkers.The synthesis of another ligand linked covalently to biotin and the use of the corresponding terbium complex allow the study of FRET with various luminescent energy acceptors among which some quantum dots.</dcterms:abstract>
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