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<dc:title xml:lang="en">Synthesis of peptides and study of their self-assembly for the formation of nanotubes</dc:title>
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<dc:subject xml:lang="fr">Nanotubes</dc:subject>
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<dc:subject xml:lang="fr">Cyclisation</dc:subject>
<dc:subject xml:lang="fr">Auto-assemblage</dc:subject>
<dc:subject xml:lang="fr">Couche-par-couche</dc:subject>
<dc:subject xml:lang="fr">Nucléobase</dc:subject>
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<dc:subject xml:lang="en">Cyclization</dc:subject>
<dc:subject xml:lang="en">Self-assembly</dc:subject>
<dc:subject xml:lang="en">Layer-by-layer</dc:subject>
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<tef:elementdEntree autoriteExterne="029211433" autoriteSource="Sudoc">Cyclisation (chimie)</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Les nanotubes organiques sont des nanomatériaux prometteurs qui ont attiré une attention considérable au cours des trois dernières décennies dans différents champs de recherche. Dans le domaine biomédical, les nanotubes permettent de délivrer des substances diverses allant de petites molécules médicaments à des virus. Les peptides cycliques composés d'un nombre pair d'acides aminés d et l alternés adoptent une conformation plate en forme de disque qui leur permettent de s’empiler les uns sur les autres, conduisant à la formation de nanotubes. La taille des peptides cycliques détermine le diamètre des nanotubes et peut être réglée jusqu’à l’échelle nanométrique, ce qui est impossible pour la plupart des nanotubes organiques. Cependant, la longueur des nanotubes atteint plusieurs micromètres et n’est pas contrôlée, ce qui représente un frein pour leur utilisation comme systèmes de délivrance.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Organic nanotubes are promising nanomaterials that have attracted considerable attention over the past three decades for different applications. In the biomedical field, the nanotubes can deliver various substances ranging from small drug molecules to viruses. Cyclic peptides composed of an even number of alternating d-and l-amino acids adopt a flat disk-like conformation, allowing their stacking on top of each other, resulting in the formation of nanotubes. The size of the cyclic peptides determines the diameter of the nanotubes and can be tuned down to the nanoscale, which is impossible for most organic nanotubes. However, the length of the nanotubes can reach several micrometers and is not controlled, which is a limitation for their use as delivery systems.In this context, we synthesized a series of cyclic peptides with different degrees of positive and negative charges, by performing an optimization study of the cyclization reaction. In addition, we studied their self-assembly capacity under various conditions using complementary analytical techniques. Some of these cyclic peptides were used to evaluate the potential of the layer-by-layer strategy as a method to construct size-controlled nanotubes. In parallel, the synthesis and self-assembly study of linear pentapeptides, derived from diphenylalanine and conjugated with nucleobases, were performed.</dcterms:abstract>
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