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  • Analytical Chemistry and Spectroscopy  (2)
  • Continuous flow electrophoresis  (2)
  • 1
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 2 (1990), S. 229-233 
    ISSN: 1040-7685
    Keywords: capillary isotachophoresis ; capillary zone electrophoresis ; detectability enhancement ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A simple isotachophoretic (ITP) preconcentration column for subsequent online capillary zone electrophoresis is described, and its use for enhancing detectability in capillary zone electrophoresis (CZE) is evaluated. Sample preconcentration using ITP is shown to enhance detectability in CZE by several orders of magnitude. Experimental verification of the detectability gain is demonstrated for cationic and anionic separations; an increase in detectability of more than 200-fold was achieved. The practical applicability of this method is demonstrated using a direct analysis of thiamine in human blood.
    Additional Material: 5 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 2 (1990), S. 80-83 
    ISSN: 1040-7685
    Keywords: capillary isotachophoresis ; determination of pyruvate ; acetoacetate ; 3-hydroxybutyrate ; lactate ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An isotachophoretic method was developed and optimized for simultaneous determination of pyruvate, acetoacetate, lactate, and 3-hydroxybutyrate in 1-10 μL of untreated heparin plasma of patients with diabetes mellitus. A commercial instrument with a column switching system was used. The preseparation capillary was filled with the leading electrolyte of pH 4.2 and the analytical capillary was filled with leading electrolyte of pH 3.0. The concentrations of individual ketone bodies and lactate found in human plasma varied within 0.01-1.4 mmol/L and 0.8-11.8 mmol/L, respectively. Analysis time was about 30 min.
    Additional Material: 3 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electrophoresis 17 (1996), S. 1906-1910 
    ISSN: 0173-0835
    Keywords: Continuous flow electrophoresis ; Free flow electrophoresis ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Continuous flow electrophoresis (CFE) was optimized by employing (i) electrophoretic regimes with stacking properties, to eliminate electrohydrodynamic dispersion, (ii) quasi-mixed zones to prevent precipitation of the stacked analytes, (iii) sheath liquid streams at the electrode compartment membranes to prevent penetration of the electrode reaction products into the separation chamber, (iv) proper engineering of the separation chamber to provide efficient dissipation of Joule heat, and (v) counterflow at the collection outlets to eliminate the problems of dead volumes and uneven collection of separated species. Data on direct temperature measurements in the separation chamber at various levels of the dissipated electric power are presented. Preparative runs of amyloglucosidase in the isoelectric focusing (IEF) mode and rat liver organelles in the isotochophoresis (ITP) mode demonstrate the high performance of the optimized CFE system.
    Additional Material: 5 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electrophoresis 19 (1998), S. 3094-3095 
    ISSN: 0173-0835
    Keywords: Preparative electrophoresis ; Continuous flow electrophoresis ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: The stability of continuous flow electrophoresis (CFE) was tested by performing uninterrupted continuous flow cationic isotachophoresis for 15 h, using a mixture of two synthetic isoelectric point (pI) markers as the model sample. This sample as well as the other operational electrolytes were continuously pumped into the CFE separation chamber via 10 individual inlets. The operational electrolyte system and the arrangement of the electrolyte streams were selected in accord with previously published results, providing a stable electrophoretic regime. The chamber had 96 individual outlets and here 96 individual fractions were collected in microwell plates in regular time intervals and scanned photometrically. The scanned photometric patterns proved that CFE is sufficiently stable for an overnight operation.
    Additional Material: 1 Ill.
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