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  • Capillary zone electrophoresis  (3)
  • Nitrate  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Kinetic-spectrofluorimetric determination of nitrite and nitrate at the nanograms per millilitre level by manual and flow-injection methods
    Amsterdam : Elsevier
    Analytica Chimica Acta 265 (1992), S. 103-110 
    Details
    ISSN: 0003-2670
    Keywords: Catalytic methods ; Flow injection ; Fluorimetry ; Foods ; Kinetic methods ; Meat ; Nitrate ; Nitrite ; Waters
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0003-2670(92)85160-8
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Simultaneous determination of diquat and paraquat residues in various matrices by capillary zone electrophoresis with diode array detection (1996)
    Springer
    Chromatographia 43 (1996), S. 468-472 
    Details
    ISSN: 1612-1112
    Keywords: Capillary zone electrophoresis ; Diode-array detection ; Diquat and paraquat residues ; Vegetables, urine and serum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The separation of diquat and paraquat by CZE has been investigated. The addition of acetonitrile (10 %, v/v) to a phosphate buffer (100 mM, pH 4.0) is necessary for effective separation of both herbicides at an optimum applied voltage of around 12 kV; the current and migration times were stable and reproducible under these conditions. The method was validated for linearity and reproducibility. The detection level calculated for diquat and paraquat was 30 and 40 nM, respectively in the injection solution. By use of stacking, these detection levels were improved by a factor of 120. The method is suitable for the determination both herbicides in samples such as herbicidal formulations, water, soil, potatoes, urine and serum. Photodiode-array detection permitted the rapid identification of both compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02292995
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  • 3
    Electronic Resource
    Electronic Resource
    Separation of fluorescein dyes by capillary electrophoresis using β-cyclodextrin (1998)
    Springer
    Chromatographia 48 (1998), S. 263-267 
    Details
    ISSN: 1612-1112
    Keywords: Capillary zone electrophoresis ; Host-guest complexation ; Fluorescein dyes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A capillary electrophoresis method for the separation and determination of five synthetic dyes used in pharmaceutical preparations, cosmetics and as food additives is described. The dyes, fluorescein, dichlorofluorescein, Rose Bengal erythrosine and eosine are well separated in less than 12 min using an electrolyte of 50 mM phosphate buffer (pH 7.5), 10 mM β-cyclodextrin and 5% (v/v) methanol. A linear relationship between concentration and peak area for each dye was obtained in the concentration range 0.3–500 μg mL−1, with a correlation coefficient greater than 0.999. Intra- and inter-day precision of about 0.2–2.6% RSD (n=11) and 4.9–9.7% RSD (n=30), respectively, were obtained. The method has been used for determining the purity of fluorescein and erythrosine in practical samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02467681
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  • 4
    Electronic Resource
    Electronic Resource
    Separation and simultaneous determination of quinolone antibiotics by capillary zone electrophoresis (1999)
    Springer
    Chromatographia 49 (1999), S. 419-423 
    Details
    ISSN: 1612-1112
    Keywords: Capillary zone electrophoresis ; Quinolone antibiotics ; Serum and urine samples
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The potential of capillary zone electrophoresis has been investigated for the separation and quantitative determination of some quinolone antibiotics. The influence of different conditions, such as the nature and concentration of the electrophoretic electrolyte, on migration time, peak symmetry, efficiency and resolution was studied. A buffer consisting of 100mm HEPES adjusted to pH 8.5 containing 10% (v/v) acetonitrile was found to furnish a very efficient and stable electrophoretic system for the separation of exoxacin, ciprofloxacin, ofloxacin, oxolinic acid, nalidixic acid and pipemedic acid. A linear relationship between concentration and peak area for each compound was obtained in the concentration range 0.25–40 μg mL−1; detection limits were approximately 0.25 ng mL−1. It was demonstrated that the method can be used for the simultaneous determination of these six antibiotics in serum and urine samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02467617
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