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Podmínky pro vysokou citlivost detekce a separační účinnost při separacích klastrových aniontů boru
Horáková, Hana ; Grüner, Bohumír ; Vespalec, Radim
The knowledge of UV-VIS spectra of investigated compounds is neccessary for the optimisation of detection sensitivity. The symmetry and narrow width of migrating zones require substantially improved dissolving power of the sample solvent and background electrolyte. Sodium borate buffer of pH 9.5 is more proper for separations of boron cluster anions in uncouted capillaries then sodium phosphate buffer of pH of 7. Decrease of mobilities of boron cluster anions with time has been found in chiral separations with .beta-CD if acetonitrile was present in background electrolyte
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Možnosti on-line spojení extrakce a chromatografie v analýze složitých vzorků
Hyötyläinen, T. ; Lüthje, K. ; Rautiainen-Rämä, M. ; Pól, Jaroslav ; Ranta-Aho, O. ; Riekkola, M. L.
In this study, on-line methodologies have been developed both for liquid and solid food samples. For liquid samples, microporous membrane liquid-liquid extraction (MMLLE) has been combined on-line with gas chromatography (GC). This MMLLE-GC method has been applied for the determination of pesticides in wine and water. The method has been extended to the analysis of solid samples as well, by combining a pressurised hot water extraction (PHWE) to the MMLLE-GC system. The PHWE-MMLLE-GC has been applied for the analysis of pesticides in grapes. For thermally labile analytes, on-line combination of supercritical fluid extraction (SFE) and liquid chromatography has been constructed and it has been applied for the analysis of lycopene in fruits. All the method developed proved to be linear, repeatable and sensitive
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