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<dc:title xml:lang="en">Synthesis of fluorescent organic nanoparticles for biological applications</dc:title>
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<dc:subject xml:lang="fr">Nanoparticules organiques</dc:subject>
<dc:subject xml:lang="fr">Fluorescence</dc:subject>
<dc:subject xml:lang="fr">Auto-assemblage</dc:subject>
<dc:subject xml:lang="fr">Calix[4]arène</dc:subject>
<dc:subject xml:lang="fr">Imagerie biologique</dc:subject>
<dc:subject xml:lang="fr">Contre-ion</dc:subject>
<dc:subject xml:lang="fr">Stabilité colloïdale</dc:subject>
<dc:subject xml:lang="fr">Transfert d'énergie</dc:subject>
<dc:subject xml:lang="en">Organic nanoparticles</dc:subject>
<dc:subject xml:lang="en">Fluorescence</dc:subject>
<dc:subject xml:lang="en">Self-assembly</dc:subject>
<dc:subject xml:lang="en">Calix[4]arene</dc:subject>
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<dc:subject xml:lang="en">Counterion</dc:subject>
<dc:subject xml:lang="en">Colloidal stability</dc:subject>
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<tef:elementdEntree autoriteExterne="034881638" autoriteSource="Sudoc">Imagerie en biologie</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="034733477" autoriteSource="Sudoc">Sondes fluorescentes</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Boîtes quantiques (QDs) et nanoparticules fluorescentes de silice (NPs) ont influencé le domaine de la bioimagerie de par leur forte luminosité et photostabilité. Par rapport aux QDs, les NPs organiques peuvent s’avérer être encore plus brillantes et entièrement biodégradables, avec une bonne biocompatibilité et sans contenir aucun élément toxique. Nous avons développé quatre types de ces NPs : en premier, des nano-gouttelettes lipidiques chargées de colorants lipophiles (flavone et Nil Rouge) pour l'imagerie in vivo chez le poisson zèbre ; en second, l’association ionique entre rhodamine B alkylée et tétraphénylborate fluoré (TPB) donne des NPs de 11-20 nm avec un rendement quantique de ~60% ; une troisième type de NPs consiste en des micelles de 7 nm obtenus par co-assemblage de cyanine amphiphiles et contre-ions TPB ; enfin, la polymérisation de micelles de calix[4]arène par agents de réticulation bi-fonctionnels à base de cyanine donne des NPs de 7 nm présentant un comportement fluorogène et une bonne stabilité en milieu intracellulaire. Ces NPs plus brillantes et de taille inférieure aux QDs apparaissent comme des outils prometteurs en bioimagerie.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Quantum dots (QDs) and fluorescent silica nanoparticles (NPs) have impacted the domain of bioimaging by their high brightness and robust photostability. In comparison to QDs, organic NPs can be even brighter and fully biodegradable, as well biocompatible and not containing toxic elements inside. Herein, we developed four types of these NPs. At first, lipid nano-droplets loaded with lipophilic flavone and Nile Red dyes for in vivo imaging in zebrafish; second, ion-association of alkyl rhodamine B with fluorinated tetraphenylborate (TPB) counterions result in 11-20 nm NPs with fluorescence quantum yield up to 60%; third, 7 nm micellar NPs obtained by co-assembly of cyanine amphiphiles with TPB counterions; finally, polymerization of calix[4]arene micelles using bi-functional cyanine crosslinkers giving 7 nm NPs, that show fluorogenic behavior and high intracellular stability. These NPs, being of smaller size and brighter than QDs, have emerged as promising tools for bioimaging.</dcterms:abstract>
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