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  • 1
    Electronic Resource
    Electronic Resource
    An overview of LC-MS interfacing systems with selected applications (1993)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 16 (1993), S. 633-641 
    Details
    ISSN: 0935-6304
    Keywords: LC-MS interfacing ; CZE-MS interfacing ; Moving belt ; Direct liquid introduction ; Thermospray ; Atmospheric pressure ionization ; Particle beam ; Continuous flow fast atom bombardment ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Advantages and limitations are described for the different LC-MS interfacing systems (moving belt; direct liquid introduction; thermospray; atmospheric pressure ionization with heated pneumatic nebulizer, electrospray, or high flow ion spray; particle beam; and continuous flow fast atom bombardment). Some comments are also made about interfacing capillary zone electrophoresis (CZE).The peculiarities of the various interfaces are described, as are liquid chromatographic requirements prior to mass spectrometry using the different ionization techniques. Selected biological and environmental applications are given.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240161103
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Mass spectrometry in stereochemical problems. 6  -  The case of mono and di-substituted norbornanes (1991)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 26 (1991), S. 977-984 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectrometric behaviour of pairs of stereoisomeric mono- and di-substituted norbornanes, namely bicyclo[2.2.1]heptane-2-endo- and -exo-carboxylic acid, methyl bicyclo[2.2.1]heptane-2-endo- and -exo-carboxylate, 2-exo-acetamidobicyclo[2.2.1]heptane-2-endo- and 2-endo-acetamidobicyclo[2.2.1]heptane-2-exo-carboxylic acid and methyl 2-exo-acetamidobicyclo[2.2.1]heptane-2-endo- and 2-endo-acetamido-bicyclo[2.2.1]heptane-2-exo-carboxylate was studied in detail with particular emphasis on characterization of the stereoisomers. The fragmentation patterns, studied with the aid of mass-analysed ion kinetic energy spectrometry, were supported by semi-empirical MO-SFC calculations, performed using the AM1 method included in the AMPAC program.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210261112
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Identification of Diels-Alder regioisomers by mass spectrometry coupled with theoretical calculations (1993)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 28 (1993), S. 752-758 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Differences in the mass spectra of Diels-Alder cyclohexene regioisomers are explained with the aid of a simple model based on the relative stability differences of the open-chain structures resulting from the alternative cleavage of the C(1)-C(2) and the C(5)-C(6) bonds of the 1-substituted cyclohexene ring. Theoretical SCF-MO calculations at a semi-empirical level proved to be useful tools for determining the relative stabilities of these open-chain radical cation structures and hence in the interpretation of mass spectra and the correct assignment of regioisomer structures from these spectra.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210280705
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    Paper (German National Licenses)
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