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  • 1
    Electronic Resource
    Electronic Resource
    Pressure-programming of a binary, on-line mixed mobile phase for capillary column SFC using a packed column SFC pumping system (1988)
    Springer
    Chromatographia 26 (1988), S. 224-228 
    Details
    ISSN: 1612-1112
    Keywords: Capillary supercritical fluid chromatography ; Piston pump ; On-line mixed mobile phases ; Antioxidants, fluorescent whitening agents, alkylarylethoxylate alcohols
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Mixed mobile phase delivery for CSFC is served by a system previously designed for packed column SFC, where a back-pressure regulator controls pressure programming. Piston pumps deliver separate flows of carbon dioxide and modifier (2-propanol). The on-line mixed phase with the injected sample is split to the capillary column. Compared to a commercially available CSFC instrument the system shows no significant differences in resolution. Applications show the advantages of using modifiers in CSFC, such as separations of polar, ionic and high molecular weight compounds, influences on selectivity and shorter retention times.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268156
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Capillary column SFC instrumentation based on piston pumps with a programmable back-pressure regulator for on-line mixing of mobile phases (1989)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 12 (1989), S. 394-399 
    Details
    ISSN: 0935-6304
    Keywords: Capillary supercritical fluid chromatography ; On-line mixed mobile phases ; Programmable back-pressure regulator ; Piston pump ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An alternative phase delivery system based on piston pumps and a back-pressure regulator has been developed for capillary column SFC. The chromatography is not affected by the fast piston pump refill. A homogeneous on-line mixing of binary phases with simultaneous pressure programming is easily accessible without any additional computing. Acceptable reproducibilities (〈 3.5% RSD for external and 〈 2.0% RSD for internal standard methods) were found with mixtures of 2-propanol/CO2 as mobile phases using UV detection and split ratios of 1:60 and 1:120. Variation and control of the split are easily done by simple flow rate volumetric changes.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240120609
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    Paper (German National Licenses)
    Fulltext
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