Isotachophoretic determination of sweeteners in model sample
Herrmannová, M.; Křivánková, Ludmila; Vytřas, K.
2005 - English An isotachophoretic method was elaborated that enables determination of sweeteners in a model sample containing eight sweeteners. The method is fast, cheap and reliable. Byla vypracována izotachoforetická metoda, která umožňuje stanovení osmi sladidel v modelovém vzorku. Metoda je rychlá, levná a spolehlivá. Keywords: isotachophoresis; sweeteners Available at various institutes of the ASCR Isotachophoretic determination of sweeteners in model sample

An isotachophoretic method was elaborated that enables determination of sweeteners in a model sample containing eight sweeteners. The method is fast, cheap and reliable....

Herrmannová, M.; Křivánková, Ludmila; Vytřas, K.
Ústav analytické chemie, 2005

Hydride preconcentration at the quartz surface for AAS: Why should an analytical chemist use it ?
Kratzer, Jan; Dědina, Jiří; Rychlovský, P.
2005 - English An evaluation of extremely simple method for antimony and bismuth preconcentration based on the novel experimental approach, in-situ trapping of stibine and bismuthine in externally heated quartz tube atomizers, is presented. V práci je prezentováno hodnocení extrémně jednoduché metody zakoncentrování antimonu a bismutu založené na novém experimentálním přístupu, in-situ záchytu stibinu a bismuthinu v zevně vyhřívaném křemenném atomizátoru. Keywords: atomic absorption spectrometry; hydride generation; hydride trapping Available at various institutes of the ASCR Hydride preconcentration at the quartz surface for AAS: Why should an analytical chemist use it ?

An evaluation of extremely simple method for antimony and bismuth preconcentration based on the novel experimental approach, in-situ trapping of stibine and bismuthine in externally heated quartz tube ...

Kratzer, Jan; Dědina, Jiří; Rychlovský, P.
Ústav analytické chemie, 2005

New approach in proteomics of gluten: using chymotrypsin and MALDI hybrid multistage mass spectrometer
Šalplachta, Jiří; Chmelík, Josef; Allmaier, G.
2004 - English Proteomic identification of gluten proteins in food Proteomická identifikace glutenových proteinů v potravinách Keywords: mass spectrometry; heat gluten; proteomics Available at various institutes of the ASCR New approach in proteomics of gluten: using chymotrypsin and MALDI hybrid multistage mass spectrometer

Proteomic identification of gluten proteins in food

Šalplachta, Jiří; Chmelík, Josef; Allmaier, G.
Ústav analytické chemie, 2004

The way from present electrophoretic chiral separation of boron cluster anions to their chiral preparations
Vespalec, Radim; Horáková, Hana; Grüner, Bohumír; Plešek, Jaromír
2004 - English The way from present electrophoretic chiral separation of boron cluster anions to their chiral preparations was discussed in detail. Keywords: capillary electrophoresis; liquid chromatography Available at various institutes of the ASCR The way from present electrophoretic chiral separation of boron cluster anions to their chiral preparations

The way from present electrophoretic chiral separation of boron cluster anions to their chiral preparations was discussed in detail.

Vespalec, Radim; Horáková, Hana; Grüner, Bohumír; Plešek, Jaromír
Ústav analytické chemie, 2004

Potential of on-line coupling of extraction and chromatography in the analysis of complex samples
Hyötyläinen, T.; Lüthje, K.; Rautiainen-Rämä, M.; Pól, Jaroslav; Ranta-Aho, O.; Riekkola, M. L.
2004 - English 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 V této studii byly vyvinuty on-line metodologie pro kapalné i pevné vzorky potravin. Pro kapalné vzorky byla kombinována mikroporézní membránová extrakce typu kapalina-kapalina (MMLLE) v on-line spojení s plynovou chromatografií (GC). Tato metoda MMLLE-GC byla použita ke stanovení pesticidů ve víně a vodě. Metoda byla též rozšířena pro použití k analýze pevných vzorků kombinací extrakce horkou vodou za zvýšených tlaků (PHWE) se systémem MMLLE-GC. Metoda PHWE-MMLLE-GC byla použita ke stanovení pesticidů v hroznech. Pro tepelně labilní analyty byla postavena on-line kombinace nadkritické fluidní extrakce (SFE) s kapalinovou chromatografií a metoda byla použita k analýze lykopenu v ovoci. Všechny vyvinuté metody jsou lineární, reprodukovatelné a citlivé Keywords: on-line - extraction; chromatography Available at various institutes of the ASCR Potential of on-line coupling of extraction and chromatography in the analysis of complex samples

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 ...

Hyötyläinen, T.; Lüthje, K.; Rautiainen-Rämä, M.; Pól, Jaroslav; Ranta-Aho, O.; Riekkola, M. L.
Ústav analytické chemie, 2004

Power of native cyclodextrins for chiral splitting of boron cluster anions
Horáková, Hana; Grüner, Bohumír; Vespalec, Radim
2004 - English 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 Alfa-cyklodextrin je nejlepší pro chirální separace klastrových aniontů boru s jedním klastrem. Beta-cyklodextrin je optimální pro separace sandwichových komplexů kobaltu; může však být použit i pro chirální separace klastrových aniontů boru s jedním klastrem. Gama-cyklodextrin není vhodný pro chirální separace klastrových aniontů boru Keywords: capillary electrophoresis; chiral separations; native cyclodextrins Available at various institutes of the ASCR Power of native cyclodextrins for chiral splitting of boron cluster anions

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 ...

Horáková, Hana; Grüner, Bohumír; Vespalec, Radim
Ústav analytické chemie, 2004

A new approach to stibine preconcentration: in-situ trapping in quartz tube atomizer for atomic absorption spectrometry
Kratzer, J.; Dědina, Jiří; Rychlovský, P.
2004 - English The objective of this work was to to introduce a novel analytical method for antimony determination at low ppt levels Předmětem této práce bylo představit novu analytickou metodu stanovení antimonu v řádu ppt Keywords: atomic absorption spectrometry; hydride generation; hydride trapping Available at various institutes of the ASCR A new approach to stibine preconcentration: in-situ trapping in quartz tube atomizer for atomic absorption spectrometry

The objective of this work was to to introduce a novel analytical method for antimony determination at low ppt levels...

Kratzer, J.; Dědina, Jiří; Rychlovský, P.
Ústav analytické chemie, 2004

The characterization of the barley proteins and glycoproteins by using separation methods and mass spectrometry
Štikarovská, Markéta; Chmelík, Josef
2004 - English This work deals with the combination of separation methods with MALDI-TOF MS. Barley proteins and glycoproteins were characterizated Tato práce pojednává o využití kombinace separačních metod s MALDI-TOF MS při charakterizaci ječmenných proteinů a glykoproteinů Keywords: barley; glycoprotein; protein Available at various institutes of the ASCR The characterization of the barley proteins and glycoproteins by using separation methods and mass spectrometry

This work deals with the combination of separation methods with MALDI-TOF MS. Barley proteins and glycoproteins were characterizated...

Štikarovská, Markéta; Chmelík, Josef
Ústav analytické chemie, 2004

Conditions for high detection sensitivity and separation efficiency in separations of boron cluster anions
Horáková, Hana; Grüner, Bohumír; Vespalec, Radim
2004 - English 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 Pro optimalizaci detekční citlivosti je nezbytné změřit UV spektra sloučenin. Symetrie a úzkých zón migrujících látek lze dosáhnout zvýšením rozpouštěcí síly rozpouštědla vzorku a základního elektrolytu. Pro separace klastrových aniontů boru v nepokryté kapiláře je vhodnější borátový pufr pH 9 než fosfátový pufr pH 7. Za přítomnsti acetonitrilu a beta-CD v základním elektrolytu byl pozorován pokles mobilit klastrových aniontů boru s časem Keywords: capillary electrophoresis; chiral separations; anionic cluster boranes Available at various institutes of the ASCR Conditions for high detection sensitivity and separation efficiency in separations of boron cluster anions

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 ...

Horáková, Hana; Grüner, Bohumír; Vespalec, Radim
Ústav analytické chemie, 2004

Development of microfluidic analytical systems using microelectronics technology
Grym, Jakub; Spěšný, Michal; Foret, František
2004 - English Keywords: microfluidic; mass spectrometry; fabrication Available at various institutes of the ASCR Development of microfluidic analytical systems using microelectronics technology

Grym, Jakub; Spěšný, Michal; Foret, František
Ústav analytické chemie, 2004