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In this PhD thesis,the hyphenation of supercritical fluid chromatography SFC with mass spectrometry MS has been studied regarding analytical performances and its application in metabolomics. The influence of a post-column liquid addition make-up and the effect of carbon dioxide have been studied regarding their impact on the ionization. The make-up allows the tuning of the ionization regardless of the chromatographic conditions and pushes the limits of quantification. Despite the obvious advantages of such a configuration, in particular the reduction of human manipulations during sample preparation, this configuration can be tricky particularly with regard to the applied extraction pressure which governs both the fluid density and the split ratio. This online extraction, analysis and detection system has been applied to the analysis of lipids in human plasma and shows potential for the analysis of complex matrices. The size-dependent properties can be tuned in situ by applying well-established synthetic protocols and by engineering the surface protective ligand shell ex situ. In this thesis, the ligand exchange reactions were applied to post-synthetically modify the protective ligand shell of atomically precise Au 25 2-PET 18 and Au 38 2-PET 24 clusters by choosing thiolated crown ether and helical ligands, respectively.

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Tests QCM. Tests Psychotechniques. Fiches Prépa-Concours.

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