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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Synthesis of Molecular Baskets and Introduction of Inward Facing Functionality

Laughery, Zachary 20 January 2006 (has links)
As a first step to producing a shape selective catalysts or enzyme mimic, two preorganized host molecules were synthesized. Binding studies of the two hosts with a variety of guests in three solvents demonstrated that an important driving force in the association was the formation of C-H???X-R hydrogen bonds (X = halogen). A deuterated host was utilized to further examine the formation of the C-H???X-R hydrogen bonds. In an effort to place functionality in the hydrophobic pocket of these hosts, two methods were developed. The first utilized directed ortho metallation to place electrophiles above and/or directed into the cavity. Perlithiation of the host could lead to sixty-nine products but reaction conditions and host rigidity limited product formation. This reaction technique led to the placement of carboxylic acid groups onto the host and the isolation of twelve products. Two different positions of the carboxylic acids (endoand exo-) direct the orientation of the guest. 1D- and 2D-NMR were utilized to examine how the was orientated inside the host. The second method employed to place functionality on the host, sited a tripodal zinc binding ligand on the side of the hydrophobic pocket of the host. The synthesized host was able to bind zinc strongly and in a 1:1 manner.
2

Towards controlled release of Vanillin and bio-sensing of Adenosine monophosphate using molecularly imprinted polymers / Vers la libération contrôlée de Vanilline et le biocapteur d'Adénosine monophosphate en utilisant polymères à empreintes moléculaires

Puzio, Kinga 19 December 2012 (has links)
Ce mémoire présente une exploration des polymères à empreintes moléculaires (MIP) comme outils d’une libération contrôlée de bioactifs olfactifs ou pour le criblage/préselection de composés à activité antivirales ou anti-tumorales sur le site actif d’une enzyme. La première partie est une étude de la complexation de la vanilline sur des billes polymériques sphériques en vue d’une libération contrôlée (pH, salinité, …). Ces études portent sur les caractéristiques de l'absorption et la libération de la molécule d'intérêt dans le milieu aqueux sur les microsphères fonctionnalisées fourni par Merck ESTAPOR® Microsphères. Nous avons ensuite synthétisé divers MIP de vanilline au format monolithique. Plusieurs stratégies d’impression ont été étudiées: non covalente, covalente et semi-covalente. La composition du MIP préparé dans chaque approche a été optimisée pour obtenir les meilleures propriétés et performances. L'affinité, la sélectivité et la capacité du MIP ont été déterminées. Les MIPs ont été évalués par extraction en phase solide (SPE) d'analogues structuraux de la vanilline dans des échantillons naturels (extrait de vanille, vin). La deuxième partie de ce mémoire concerne l’évaluation de MIPs de l’adénosine 5’-monophosphate (AMP) Le polymère a été préparé par une approche non-covalente et son efficacité de recapture a été caractérisée par analyse frontale (FA). L’analyse frontale est une technique qui permet de discriminer des interactions spécifiques des non spécifiques et de comprendre les mécanismes de liaison dans des cavités spécifiques. / This thesis report presents the exploration of molecularly imprinted polymers (MIP) for the application in controlled release and targeting antivirus and anticancer drugs. The first part of this study describes the imprinting of vanillin as a monolith. Several strategies were studied: non-covalent, covalent and semi-covalent. The composition of the MIP prepared in each approach was optimized to obtain the best properties and performance. The affinity, selectivity and capacity of MIP were determined. MIPs were evaluated in solid-phase extraction (SPE) of structural analogues in natural samples (vanilla extract, wine). We also present the study of the exploration of spherical beads as potential tools for the controlled release of vanillin. These studies concern the characteristics of uptake and release of the molecule of interest in the aqueous medium on functionalised microspheres supplied by Merck ESTAPOR Microspheres®. The second part of this thesis is devoted to studies on the evaluation of MIP of adenosine 5'-monophosphate (AMP). The polymer was prepared in non-covalent approach and efficiency of binding was characterised using frontal analysis (FA). FA is a useful technique that allows discriminate specific and nonspecific interactions and to understand the binding mechanisms in specific cavities.

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