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  • Electronic Resource  (2)
  • Analytical Chemistry and Spectroscopy  (1)
  • Kirkwoodg factor  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The pressure dependence of the dielectric constant and density of acetonitrile at three temperatures (1977)
    Springer
    Journal of solution chemistry 6 (1977), S. 357-367 
    Details
    ISSN: 1572-8927
    Keywords: High pressure ; dielectric constants ; density ; acetonitrile ; temperature dependence ; Kirkwoodg factor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The static dielectric constant of liquid acetonitrile is reported at 10, 25, and 40°C and at pressures up to 3 kbar. Densities of pure acetonitrile were measured where needed in order to analyze the dielectric measurements using the Kirkwood-Fröhlich equation. The Kirkwood correlation factorg K was found to be less than unity with a positive temperature but negative pressure coefficient, suggesting an increasing anticorrelation of dipoles with decreased temperature and increased pressure. Theg K factors are analyzed by a dipole pair-bonding model as outlined by Dannhauser and Flueckinger in which the lowg K values are attributed to the presence of dimers consisting of completely anticorrelated dipoles. The implication of this model on other measurements, especially MNR relaxation studies, is examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00647050
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The assay of antibiotics in pharmaceutical preparations using reverse-phase HPLC (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 211-215 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; Reverse phase separation of 9 antibiotics ; Down to 5 min analysis time, less than 4% repeat variation ; Precise analytical conditions given ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chromatographic methods are presented for the determination of chloramphenicol, erythromycin, tyrothricin, nystatin, penicillin, streptomycin, sulphanilamides and nitrofurans, in some pharmaceutical formulations. The methods have been applied in routine analysis and are in general capable of distinguishing the main antibiotic from decomposition products and likely congeners.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020503
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    Paper (German National Licenses)
    Fulltext
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