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National Repository of Grey Literature 6 records found  Search took 0.00 seconds. 
Determination of stability constant of potassium-dibenzo-18-crown-6 complex in mixed hydro-organic solvents by affinity capillary electrophoresis
 Konášová, Renáta ; Jaklová Dytrtová, Jana ; Kašička, Václav
Affinity capillary electrophoresis was applied to determination of apparent stability constant, Kst, of potassium-dibenzo-18-crown-6 complex in mixed hydro-organic solvents, i.e. mixtures of water with methanol, ethanol, propan-2-ol or acetonitrile. It was found that the Kst strongly depends on the solvent composition. The log Kst values linearly increase with decreasing molar fraction of water in the above hydro-organic solvent mixture.
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Mimicking of thiram metabolism using electrochemistry hyphenated with mass spectrometry
 Jaklová Dytrtová, Jana ; Jakl, M.
On-line hyphenation of a home-made electrochemical cell with an electrospray ionization mass spectrometer (EC-ESI-MS) was investigated to be applicable in mimicking of thiram (T) metabolism. The EC-ESI-MS instrumental approach confirms the creation of the first metabolic product of T (Tm). Tm is created via the decay of the disulfide bond. The catalytic effect of copper originated from the copper working electrode to this reaction is discussed.
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Capillary electrophoretic study of solvent effects on complexation of dibenzo-18-crown-6 with potassium ions
 Konášová, Renáta ; Jaklová Dytrtová, Jana ; Kašička, Václav
Affinity capillary electrophoresis was applied to investigation of solvent effects on stability constant of dibenzo-18-crown-6 complex with potassium ion in mixed hydro-organic solvents at different water/methanol, water/ethanol and water/propan-2-ol ratios. The apparent stability constants of the complex were found to be strongly decreasing with increasing molar fraction of water in the mixed solvents.
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Detection of Dasatinib using Pre-reaction with Copper and Mass Spectrometry
 Jaklová Dytrtová, Jana ; Jakl, M. ; Navrátil, Tomáš
The determination of dasatinib (DAS) was provided using front-end electrochemical separation with mass detection. The electrochemical separation is based on the reaction of DAS with copper solid electrode. The affinity of DAS to copper is supported by redox reaction yealding to DAS fragmentation.
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Affinity capillary electrophoresis applied for study of solvent effect on stability constant of dibenzo-18-crown-6 complex with potassium ion
 Konášová, Renáta ; Jaklová Dytrtová, Jana ; Kašička, Václav
Affinity capillary electrophoresis was used for investigation of solvent effect on stability constant of dibenzo-18-crown-6 complex with potassium ion in mixed hydro-organic solvents at different water/methanol and water/ethanol ratios. The stability constant of the complex was decreasing with increasing molar fraction of water in mixed solvents and almost independent of the organic solvent used.
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Detection of Thiram Pesticide using Copper Affinity Electrochemical Separation Electrospray Ionization Mass Spectrometry
 Jaklová Dytrtová, Jana ; Navrátil, Tomáš ; Jakl, M. ; Nováková, Kateřina
The detection of pesticides in environmental matrices has a purpose in analytical chemistry and it is important for understanding their role in the environment 1-3. Direct detection of pesticides in environmental matrices is complicated due to many occurring interactions with metals (e.g., Ca, Cu, Mg, Zn). The experimental utilization of combining electrochemical cell with mass spectrometry is shown in the case of thiram (T). The method is based on high affinity of copper cations to many ligands.
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