About: On-line preconcentration of weak electrolytes by electrokinetic accumulation in CE: Experiment and simulation

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	A new on-line preconcentration technique was developed that makes possible to determine nanomolar concentrations of weak acidic analytes in CE. The method consists of long-running electrokinetic sample injection and stacking (electrokinetic immobilization) of the analytes at a boundary of two electrolytes with different pH values (pH 9.5 and 2.5) and consequent mobilization of the stacked uncharged analytes in a micellar system (containing SDS micelles). Several factors including buffer concentration, pH, applied voltage, time of preconcentration, and SDS concentration were tested to optimize the analysis method. An about 4600-fold increase of the sample concentration (in comparison with the standard CZE) can be achieved during the preconcentration step. Two preservatives applied in food industry - benzoic acid and sorbic acid were used as model samples. The applicability of the proposed method in food analysis was demonstrated by determination of nanomolar concentrations of benzoic acid in sunflower A new on-line preconcentration technique was developed that makes possible to determine nanomolar concentrations of weak acidic analytes in CE. The method consists of long-running electrokinetic sample injection and stacking (electrokinetic immobilization) of the analytes at a boundary of two electrolytes with different pH values (pH 9.5 and 2.5) and consequent mobilization of the stacked uncharged analytes in a micellar system (containing SDS micelles). Several factors including buffer concentration, pH, applied voltage, time of preconcentration, and SDS concentration were tested to optimize the analysis method. An about 4600-fold increase of the sample concentration (in comparison with the standard CZE) can be achieved during the preconcentration step. Two preservatives applied in food industry - benzoic acid and sorbic acid were used as model samples. The applicability of the proposed method in food analysis was demonstrated by determination of nanomolar concentrations of benzoic acid in sunflower (en)
Title	On-line preconcentration of weak electrolytes by electrokinetic accumulation in CE: Experiment and simulation On-line preconcentration of weak electrolytes by electrokinetic accumulation in CE: Experiment and simulation (en)
skos:prefLabel	On-line preconcentration of weak electrolytes by electrokinetic accumulation in CE: Experiment and simulation On-line preconcentration of weak electrolytes by electrokinetic accumulation in CE: Experiment and simulation (en)
skos:notation	RIV/61989592:15310/07:00004837!RIV10-MSM-15310___
http://linked.open...avai/riv/aktivita	P S Z
http://linked.open...avai/riv/aktivity	P(ME 895), S, Z(MSM6198959216)
http://linked.open...iv/cisloPeriodika	10
http://linked.open...vai/riv/dodaniDat	2010
http://linked.open...aciTvurceVysledku	Petr, Jan Maier, Vítězslav Ševčík, Juraj Horáková, Jana
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Palackého v Olomouci / Přírodovědecká fakulta
http://linked.open...dnocenehoVysledku	439525
http://linked.open...ai/riv/idVysledku	RIV/61989592:15310/07:00004837
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	CE; dynamic pH junction; electrokinetic accumulation; on-line preconcentration; simulation (en)
http://linked.open.../riv/klicoveSlovo	electrokinetic accumulation simulation on-line preconcentration dynamic pH junction CE
http://linked.open...odStatuVydavatele	DE - Spolková republika Německo
http://linked.open...ontrolniKodProRIV	[1DA1DFA720C0]
http://linked.open...i/riv/nazevZdroje	Electrophoresis
http://linked.open...in/vavai/riv/obor	CB
http://linked.open...ichTvurcuVysledku	4 (xsd:int)
http://linked.open...cetTvurcuVysledku	8 (xsd:int)
http://linked.open...vavai/riv/projekt	http://linked.opendata.cz/resource/domain/vavai/projekt/ME%20895
http://linked.open...UplatneniVysledku	2007
http://linked.open...v/svazekPeriodika	28
http://linked.open...iv/tvurceVysledku	Gaš, Bohuslav Horáková, Jana Petr, Jan Tesařová, Eva Maier, Vítězslav Ševčík, Juraj Veis, Libor Armstrong, Daniel W.
http://linked.open...n/vavai/riv/zamer	Modulation of signalling and regulatory pathways in normal and cancer cells
issn	0173-0835
number of pages	8 (xsd:int)
http://localhost/t...ganizacniJednotka	15310

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