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  • 1
    Electronic Resource
    Electronic Resource
    Group-Type Identification of Oil Samples Using Comprehensive Two- Dimensional Gas Chromatography Coupled to a Time-of-Flight Mass Spectrometer (GC×GC-TOF) (2000)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 23 (2000), S. 507-510 
    Details
    ISSN: 0935-6304
    Keywords: Comprehensive two-dimensional GC ; time-of-flight ; oil analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---In this work a comprehensive two-dimensional system (GC×GC) was coupled to a time-of-flight mass spectrometer (TOF/MS) for the analysis of oil samples. Group-types like the alkanes and saturated cyclic compounds (naphthenes), which are present in oil, are shown separately by selecting their unique masses. On selecting appropriate ion fragments, this method also permits the determination of sulfur- and oxygen-containing species in oil. Former results obtained by FID detection could be confirmed. After proper selection of unique ions in GC×GC-TOF both selectivity and sensitivity increase.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    Training software for electrophoresis (1995)
    Weinheim : Wiley-Blackwell
    Electrophoresis 16 (1995), S. 2008-2015 
    Details
    ISSN: 0173-0835
    Keywords: Training software ; Computer simulation ; Capillary electrophoresis ; Capillary isotachophoresis ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Computer programs, simulating electrophoretic separations, were evaluated and discussed with respect to their suitability for training purposes. Quite a number of them, mainly those dealing with steady-state phenomena, are sufficiently fast and user-friendly for the purpose of visualization of electrophoretic principles. Transient-state or dynamic models, however, are more suitable for the advanced user, mainly because of their inherent complexity and long calculation times.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.11501601329
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Chiral interactions in capillary zone electrophoresis: Computer simulation and comparison with experiment (1997)
    Weinheim : Wiley-Blackwell
    Electrophoresis 18 (1997), S. 938-942 
    Details
    ISSN: 0173-0835
    Keywords: Capillary electrophoresis ; Chiral separation ; Mandelic acid ; Terbutaline ; Cyclodextrin ; Simulation ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Chiral interaction in capillary electrophoresis can be modeled using pK values, mobilities of analytes, and their formation constants with the chiral selector. An existing steady-state simulation program for CE (HPCESIM) was recently extended with a chiral submenu involving the chiral parameters listed above. These were experimentally determined in both our laboratories for mandelic acid and terbutaline using hydroxypropylated β-cyclodextrin as chiral selector. A comparison was made between both sets of parameters and between experimental electropherograms and those obtained from simulation. Error analysis of the results indicate the sensitivity of the obtained results.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150180614
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Ergot alkaloids as novel chiral selectors in capillary electrophoresis (1996)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 19 (1996), S. 225-226 
    Details
    ISSN: 0935-6304
    Keywords: Capillary electrophoresis ; Chiral separation ; Ergot alkaloids ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240190412
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Discontinuities of pH at zone boundaries in isotachophoretic systems with poorly buffering leading electrolytes (1998)
    Weinheim : Wiley-Blackwell
    Electrophoresis 19 (1998), S. 1601-1605 
    Details
    ISSN: 0173-0835
    Keywords: Isotachophoresis ; Theory ; Computer simulation ; pH ; Zone boundaries ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Discontinuities of pH at zone boundaries of strong ion sample zones in isotachophoretic systems with poorly buffering leading electrolytes have been discovered by dynamic computer simulations of isotachophoretic separations with uncommon electrolyte systems. When using a salt solution containing a strong cation (anion) as leading ion and a weak anion (cation) as counterion for the isotachophoretic separation of strong cations (anions), severe pH discontinuities are present at zone boundaries of these cations (anions). The magnitude of these pH discontinuities has been investigated as a function of several parameters, namely counter ion/leading ion concentration ratio of the leading electrolyte, pK values, and mobilities of sample ions and counterion.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150191014
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    Paper (German National Licenses)
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