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  • 1
    Electronic Resource
    Electronic Resource
    Characterization of glass, quartz, and fused silica capillary column surfaces from contact-angle measurements (1981)
    Springer
    Chromatographia 14 (1981), S. 387-397 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Capillary columns ; Fused silica ; Contact angle ; Wettability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary This paper describes the systematic characterization of glass and the newly introduced fused silica and quartz capillary columns from surface wettability measurements. Common gas chromatographic stationary phases were used in capillary-rise measurements at temperatures up to 300°C. By construction of Zisman plots and using the Cassie equation, the relative surface concentrations of wettable and non-wettable groups were determined. By application of the Fowkes equation, the dispersion force component of the surface energy was investigated. The influence of various surface treatments such as leaching, silylation, and polymeric film formation are discussed. Wettability measurements were also used to evaluate the thermostability of various treated surfaces and to compare the surface properties of glass, quartz, and fused silica. The wettability of the surfaces with selected stationary phases as a function of temperature is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262872
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  • 2
    Electronic Resource
    Electronic Resource
    Capillary electrochromatography using columns packed with a supercritical fluid carrier (1996)
    Springer
    Chromatographia 43 (1996), S. 313-321 
    Details
    ISSN: 1612-1112
    Keywords: Capillary electrochromatography ; Detectors ; Columns ; Pharmaceuticals ; Polycyclic aromatic hydrocarbons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Columns for capillary electrochromatography may be prepared by packing reversed phase silica-based material using a supercritical fluid carbon dioxide carrier. Procedures for the in-situ manufacture of frits and UV detection windows, and the wetting of columns are described. The columns were employed in two commercial instruments (and a home-built system), and their properties investigated during the separation of standard mixtures of test compounds. The columns are highly efficient and durable, with reduced plate heights of 1.0–1.4. The repeatability of retention time, peak area and peak height was measured. The influence of applied voltage and column temperature and of electrokinetic injection parameters was explored, along with other practical considerations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02271002
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  • 3
    Electronic Resource
    Electronic Resource
    “Short-end injection” rapid analysis capillary electrochromatography (1998)
    Springer
    Chromatographia 47 (1998), S. 135-140 
    Details
    ISSN: 1612-1112
    Keywords: Capillary electrochromatography ; Short-end injection ; Rapid analysis ; Voltage gradient ; Detached capillaries
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The analytical benefits of using “short-end injection” rapid analysis in capillary electrochromatography (CEC) have been demonstrated. These include extremely rapid analysis times, the potential for voltage gradients to be exploited, high hydrodynamic loadability and the convenience of using short detachable lengths of packed capillaries. “Short-end injection” rapid CEC has been demonstrated for the analysis of a standard neutral test mixture and three pharmaceutically active steroids. Extremely short analysis times were obtained due to the increased effective field strength experienced by the packed bed and the reduced length to the detector. In conjunction with an appropriate sampling rate, peak efficiencies in excess of 554,000 plates/metre (i.e. 41,500 plates per column) could be obtained. The repeatability of retention time and peak area compared favourably to that obtained using a conventional CEC approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02466572
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