Zobrazeno 1 - 10
of 160
pro vyhledávání: '"Karel Štulík"'
Publikováno v:
Sensors, Vol 13, Iss 3, Pp 2786-2801 (2013)
The paper provides a critical discussion of the present state of the theory of high-frequency impedance sensors (now mostly called contactless impedance or conductivity sensors), the principal approaches employed in designing impedance flow-through c
Externí odkaz:
https://doaj.org/article/5bda245baa4f43148b94c51f6f4ffd68
Publikováno v:
ELECTROPHORESIS. 34:2058-2064
A fused-silica capillary with a common outer diameter, 360 μm, but containing seven internal channels, each 28 μm in diameter (a multichannel capillary), has been tested on electrophoretic separations of mixtures of dopamine, adrenaline, and noradr
Publikováno v:
Analytical and Bioanalytical Chemistry. 404:1549-1554
The methodology for separations of saccharides in standard electrophoretic systems has been transferred to the short-capillary electrophoresis format. The laboratory-designed apparatus used employs a quartz capillary with an internal diameter of 10
Publikováno v:
Sensors and Actuators B: Chemical. 161:811-817
A new type of electrolyte, based on immobilization of a hydrophobic ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate (BMIPF 6 ) or 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)-imide (EMITFSI) within the structure of partially
Publikováno v:
Electroanalysis. 23:1870-1874
The behaviour of a contactless conductivity detector was studied in its application to capillary electrophoresis employing quartz capillaries with inner diameters (i.d.) of 10 to 75 µm. The detector output signal was measured using KCl as the test e
Publikováno v:
Analytica Chimica Acta. 698:1-5
A capillary electrophoresis (CE) procedure with contactless conductivity detection (C4D) has been developed for monitoring of neutral mono- and disaccharides in drinks and foodstuffs. The separation of a mixture of seven neutral saccharides (glucose,
Publikováno v:
Electroanalysis. 23:1325-1328
A simple cell, consisting of two insulated wire electrodes placed in a PTFE tube through which the test gaseous phase flows, has been applied to capacitively coupled contactless conductometric detection (C4D) and determination of water vapour in the
Autor:
Karel Štulík, František Opekar
Publikováno v:
ELECTROPHORESIS. 32:795-810
Analyses of very complex samples involving capillary and chip electrophoresis often require dual (multiple) detection to attain sufficient selectivity of determination. The present work reviews and critically evaluates selected combinations of electr
Autor:
Pavel Coufal, Adéla Svobodová, Tomáš Křížek, Karel Štulík, Jakub Sirc, Petr Šálek, Eva Tesařová
Publikováno v:
Journal of Chromatography A. 1218:1544-1547
A very simple and readily performed method is described for the preparation of poly(styrene-divinylbenzene-methacrylic acid) monolithic columns for capillary liquid chromatography. The effect of the methacrylic acid content on the morphological and c
Publikováno v:
Electroanalysis. 22:2353-2358
The possibilities of impedimetric determinations of organic liquids in mixtures with aqueous solutions have been studied in detail, using a planar capacitor cell combined with multivibrator and operational amplifier circuits functioning as a differen