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  • 1
    Electronic Resource
    Electronic Resource
    Isolation and structural analysis by mass analysed ion kinetic energy spectroscopy of diverse sidechains from steroids of similar tetracyclic carbon skeletons (1979)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 6 (1979), S. 340-344 
    Details
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The technique of mass analysed ion kinetic energy spectroscopy has been applied to the structural determination of five different substituent sidechains from five steroids of similar ring anatomy. A mass spectrometer of reversed geometry, which permits ion selection according to its mass-to-charge ratio before the ions enter the electric sector, was used to isolate the ion corresponding to the mass of each particular sidechain. Subsequent mass analysed ion kinetic energy spectra of the selected ion demonstrated daughter ions whose compositions were compatible with the structures of the model compounds. This ability to determine the structure of a specific portion of a large molecule and to permit differentiation of minor structural features in a series of compounds, whose major framework is similar, adds a new dimension to the powerful mass analysed ion kinetic energy spectroscopy technique for structural analysis of complex biological molecules.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200060806
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Elemental compositions from daughter ion spectra of m1+ and [m1 + 1]+: Some applications of the method (1988)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 23 (1988), S. 712-718 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The elemental compositions of ions can be determined in tandem mass spectrometry by comparing the daughter ion spectra of the m1+ and [m1 + 1]+ ions. The method is demonstrated for mass-analyzed ion kinetic energy spectra but is applicable to all types of daughter ion spectra, including complex collisionally activated dissociation spectra. In this work, the method is applied to compounds that produce daughter ions of known elemental compositions, and the errors and limitations are evaluated. Following that test, the procedure is applied to a compound that may produce daughters of more than one possible elemental composition. The method is sometimes useful even if the formula of the parent is not known; that is, the formulae of unknown parent and daughter ions may be found. Locating a specific atom in an isotopically labeled molecule is another capability of the method. The basic equation of the method was generalized and incorporated into a computer program for performing the calculations.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210231007
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Interference peaks in mass analysed ion kinetic energy spectra (1979)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 14 (1979), S. 313-318 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: When mass analysed ion kinetic energy spectroscopy is performed on ions of low abundance and low mass compared with the rest of the ions present in the ion chamber, severe interference may be observed. The major form taken by the interference is of narrow peaks at non-integral mass numbers. Many such peaks can be observed in mass analysed ion kinetic energy spectra and they are mainly attributed to decompositions of metastable ions occurring in the first field free region of the reversed geometry double focusing mass spectrometer.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210140606
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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