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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 a Glycolipid Analogue Towards the Design of a Biomimetic Cell Membrane

Singh, Serena 17 August 2012 (has links)
The synthesis of the three 6”-deoxy-6”-thio glycolipid analogues β-D-Gal-(1→6)-β-D-Gal-(1→4)-β-D-Glu-(1→OCH2)-[1,2,3]-triazole-1-dodecane, β-D-Gal-(1→4)-β-D-Glu-(1→4)- β-D-Glu-(1→OCH2)-[1,2,3]-triazole-1-dodecane and β-D-Gal-(1→4)-β-D-Glu-(1→4)-β-D-Glu-(1→OCH2)-[1,2,3]-triazole-1-octadecane is presented here. Glycosylation at position O-4’ of a propargyl cellobioside glycosyl acceptor and position O-6’ of a propargyl lactoside glycosyl acceptor with a 6-thio-6-deoxy galactosyl donor gave rise to two unique trisaccharides that in turn underwent copper-catalyzed azide-alkyne cycloadditions with either 1-azidododecane or 1-azidooctadecane. The potential for each of these analogues to function as tethers of lipid bilayers to Au(111) was assessed primarily by differential capacitance experiments. Deposition of a bilayer of DMPC/cholesterol (70:30) by Langmuir-Blodgett (LB) transfer followed by Langmuir-Schaefer (LS) touch to a self-assembled monolayer of the O-6’ linked analogue, diluted with 1-β-D-thioglucose, failed. This led to simplifying the target architecture to diagnose the quality of the monolayers. A monolayer of the known monosaccharide 1-octadecane-4-(6-thio-β-D-galacto-pyranosyloxymethyl)-[1,2,3]-triazole1 prepared by LB transfer was found to support a lipid monolayer deposited by LS touch and this bilayer had the lowest minimum capacitance observed of 0.9 µF/cm2. An attempt to produce a bilayer by the same method using the trisaccharide bearing the C-18 alkane chain failed and this was attributed to high water solubility, which gave rise to poor organization at the air-water interface. A self-assembled monolayer of this variant went forward to produce a poor quality bilayer with a minimum capacitance of 7.1 µF/cm2, which was the lowest value obtained for the trisaccharide series of analogues. / Natural Sciences and Engineering Research Council of Canada (NSERC)

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