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  • 1
    Electronic Resource
    Electronic Resource
    On-line isotachophoretic sample preconcentration for enhancement of zone detectability in capillary zone electrophoresis (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 2 (1990), S. 229-233 
    Details
    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
    URL: http://dx.doi.org/10.1002/mcs.1220020505
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of pyruvate, acetoacetate, lactate, and 3-hydroxybutyrate in plasma of patients with diabetes mellitus by capillary isotachophoresis (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 2 (1990), S. 80-83 
    Details
    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
    URL: http://dx.doi.org/10.1002/mcs.1220020207
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  • 3
    Electronic Resource
    Electronic Resource
    Separation of aracytidine and cytidine by capillary electrophoretic techniques (1996)
    Weinheim : Wiley-Blackwell
    Electrophoresis 17 (1996), S. 1954-1958 
    Details
    ISSN: 0173-0835
    Keywords: Capillary zone electrophoresis ; Aracytidine ; Cytidine ; Serum analysis ; Micellar electrokinetic chromatography ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Aracytidine (cytarabine, 1-β-D-arabinofuranosylcytosine) is a synthetic analog of cytidine in which ribose is substituted by arabinose; it is used as a drug for the treatment of leukemia. A fast and reliable capillary electrophoretic method for the analysis of cytarabine and cytidine is described. The procedure utilizes the interactions with sodium dodecyl sulfate (SDS) micelles and borate, present in the background electrolyte, for the mobilization and selective separation of the analytes. The detection is carried out by UV absorbance at 275 nm. The method was applied both to pharmaceutical preparations and human serum. Analysis of an untreated serum requires 15 min; the detection limit is 0.8 μg/mL and the relative standard deviation (RSD) is 5.3%.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150171225
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