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  • 1
    Electronic Resource
    Electronic Resource
    Analysis of low molecular weight constituents of polypropylene and other polymeric materials using on-line SFE-SFC (1991)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 14 (1991), S. 164-168 
    Details
    ISSN: 0935-6304
    Keywords: Capillary supercritical fluid chromatography ; Supercritical fluid extraction ; On-line combination ; Polymer additives ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Additives and oligomers from polymers were quantitatively extracted and separated using on-line SFE and capillary SFC. Conditions were found which extracted the additives selectively and separated them from the co-extracted oligomers.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240140305
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  • 2
    Electronic Resource
    Electronic Resource
    Application of supercritical fluid extraction and supercritical fluid chromatography to the production of taxanes as anti-cancer drugs (1993)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 16 (1993), S. 666-670 
    Details
    ISSN: 0935-6304
    Keywords: Supercritical fluid extraction ; Supercritical fluid chromatography ; Supercritical fluid co-solvent (modifier) ; Fused silica open tubular capillary column ; Liquid solvent extraction ; Timed-split injection ; Restrictor ; Flame ionization detector (FID) ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The supercritical fluid extraction (SFE) of taxicin from the dried needles of the English yew tree, Taxus baccata is described. Analysis by supercritical fluid chromatography (SFC) and proton NMR spectroscopy was used to confirm identity and purity. The extraction efficiency of SFE is comparable with that obtained using liquid solvents. Such taxanes may be used semi-synthetically to prepare potential anti-cancer drugs.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240161109
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  • 3
    Electronic Resource
    Electronic Resource
    Band broadening during mobile phase change in unified chromatography (GC-SFC) (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 5 (1993), S. 237-243 
    Details
    ISSN: 1040-7685
    Keywords: unified chromatography ; gas chromatography ; supercritical fluid chromatography ; open tubular columns ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Band broadening brought about by changing the mobile phase from the GC mode to the SFC mode in unified chromatography is discussed. Its origin is shown to result from several factors: the replaceable volume of the tubing and valves in front of and following the column; the volume, internal diameter, and film thickness of the open tubular column; the initial pressure of the supercritical mobile phase; and the column temperature. Improvements to restrict band broadening were achieved by optimizing the system and its operating conditions.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mcs.1220050308
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  • 4
    Electronic Resource
    Electronic Resource
    Preparation and evaluation of supercritical carbon dioxide-packed capillary columns for HPLC and SFC (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 6 (1994), S. 249-255 
    Details
    ISSN: 1040-7685
    Keywords: packed capillary column ; column technology ; liquid chromatography ; supercritical fluid chromatography ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Preparation of packed capillary columns with supercritical carbon dioxide as the packing carrier is demonstrated; column performance was evaluated by both HPLC and SFC. It is shown that this procedure yields excellent column performance. The density of the packed bed can be controlled by varying the restrictor dimensions and the packing pressure. Column preparation using a supercritical fluid is more rapid than with liquid slurry packing and yields good column stability. Because supercritical fluids have a wider range of viscosities and velocities, in comparison with gases and liquids, a wide choice of packing conditions is available. Several applications of columns packed by this method are presented.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mcs.1220060309
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  • 5
    Electronic Resource
    Electronic Resource
    Xenon as a mobile phase in supercritical fluid chromatography (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 3 (1991), S. 337-347 
    Details
    ISSN: 1040-7685
    Keywords: supercritical fluid chromatography ; mobile phases ; xenon ; SFC-FTIR ; polynuclear aromatic hydrocarbons ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Supercritical xenon and CO2 are compared as solvents by means of solubilities (calculated by means of the Peng-Robinson equation of state) and chromatographic behavior for some polynuclear aromatic hydrocarbons; reasons for the apparent superiority of xenon are discussed. The advantages of the use of xenon as a mobile phase in coupled supercritical fluid chromatography-Fourier transform infrared spectrometry are evaluated from analyses of monomer and oligomer mixtures.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mcs.1220030408
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  • 6
    Electronic Resource
    Electronic Resource
    Unified open tubular column chromatography: Sequential gas chromatography, at normal pressures, and supercritical fluid chromatography on the same column (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 3 (1991), S. 403-409 
    Details
    ISSN: 1040-7685
    Keywords: unified chromatography ; supercritical fluid chromatography ; gas chromatography ; open tubular column ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A unified chromatograph was constructed in which open tubular column gas chromatography, at normal helium carrier gas pressures, followed by supercritical fluid chromatography with carbon dioxide mobile phase was carried out in a single run using a 100-μm i. d. column. Sample introduction was accomplished by means of a pneumatically-actuated rotary injection valve. A second rotary valve was used post-column to direct the flow of column effluent to the flame ionization detector through an uncoated fused silica restrictor during the GC separation mode or to the FID through a frit restrictor during the SFC separation mode. This novel valve switching arrangement allowed system operating parameters of temperature and pressure programs and linear velocities to be optimized independently of each separation mode. The unified GC/SFC system was demonstrated for practical applications in various fields of process and product quality control.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mcs.1220030504
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