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  • 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.
    Type of Medium: Electronic Resource
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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.
    Type of Medium: Electronic Resource
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