National Repository of Grey Literature 10 records found  Search took 0.00 seconds. 
Trace analysis of iodide in biological and environmental samples by on-line combination of cITP-CZE
Urbánek, Marek ; Pantůčková, Pavla ; Křivánková, Ludmila
Development and application of the method of on-line combination of capillary isotachophoresis with capillary zone electrophoresis (cITP-CZE) for the determination of iodide in urine, seawater and in selected mineral waters.
Preparation and optimization of packing of microcolumns for HPLC and SFC
Planeta, Josef
The lecture summarizes the study of the influence of packing conditions on the efficiency and the total porosity of the prepared columns. For both critical and supercritical CO2, optimum packing conditions were found.and their reproducibility was defined.
Capillary Electrophoresis in the Analysis of Chiral Species
Vespalec, Radim
An overview of methodology of chiral separations by using capillary electrophoresis in free solution is given.
Liquid chromatography and capillary electrophoresis - partners or rivals?
Vespalec, Radim
Advantages, limitations and complementarity of both instrumental separation techniques were discussed.
pK determination of sparingly soluble weak bases
Vlčková, Markéta ; Barták, P. ; Vespalec, Radim
pK values of sanguinarine and chelerythrine have been determinedat conditions of planned interaction measurements and renasons for the pread of published pK data of these weak bases have been investigated.
Chiral separation of charged cluster boranes
Slavíček, V. ; Vespalec, Radim
Capillary zone electrophoresis is effective instrumental technique for chiral separations of charged cluster boranes if β-cyclodextrin serves as chiral selector.
The way from present electrophoretic chiral separation of boron cluster anions to their chiral preparations
Vespalec, Radim ; Horáková, Hana ; Grüner, Bohumír ; Plešek, Jaromír
The way from present electrophoretic chiral separation of boron cluster anions to their chiral preparations was discussed in detail.
Capillary zone electrophoresis of samples with high conductivity matrix. Optimization of borate separation medium
Křivánková, Ludmila ; Gebauer, Petr ; Březková, M.
Capillary zone electrophoresis proved to be a very useful method for analyses of many kinds of samples. The most often used background electrolyte system is borate buffer containing usually sodium, ammonium or Tris. Using of borate buffer we have proven, that not only coion but also counterion can be used for optimization of the separation. Experiments and calculations explaining behavior of analytes in sodium and ammonium system were verified by computer simulation using programme Simul 4.0.
Schopnost nativních cyklodextrinů chirálně dělit klastrové anionty boru
Horáková, Hana ; Grüner, Bohumír ; Vespalec, Radim
Alfa-cyclodextrin is optimal for chiral separations of single-cage boron cluster anions only. Beta-cyclodextrin is optimal for chiral splitting of sandwich cobalt complexes, however, it may be used for the chiral splitting of single-cage boron cluster anions, too. Gama -cyclodextrin is not proper for chiral separations of boron cluster anions
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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