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  • Wiley-Blackwell  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 2 (1969), S. 427-429 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: It is shown that FI mass spectra can serve to elucidate some structural features and determine the molecular weights of mono- and oligosaccharides.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 983-991 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mass analysis of mono- and oligosaccharides was carried out by the field ionization (FI) method. Unsubstituted monosaccharides exhibit an intense peak at [M + 1]+ in the FI spectra, but are not so suited to structural analysis because of their thermal instability. Permethylation is the most suitable method of obtaining good FI mass spectra of oligosaccharides. Permethylated disaccharides which are linked via C-1 - C-4 or C-1 - C-6, respectively, exhibited characteristic differences in the fragment ion intensities. It is not possible, however, to derive all of the different modes of linkage from the FI mass spectrum of permethylated raffinose. The field desorption method is more suitable for further studies of thermally instable compounds than the method of sample evaporation from an oven with subsequent field ionization.
    Notes: Mit Hilfe der Feldionisation wurde die Massenanalyse von Mono- und Oligosacchariden durchgeführt. Die FI-SpektrenFI wird als Abkürzung für Feldionisation und ES für Elektronenstoß-Ionisation benutzt.unsubstituierter Monosaccharide zeigtren zwar alle einen intensiven Peak auf der MZ [M + 1], eignen sich aber wegen der thermischen Labilität nur schlecht für Strukturanalysen. Im Hinblick auf Oligosaccharide ist eine Permethylierung für die Aufnahme von FI-Massenspektren vorteilhaft. Permethylierte Disaccharide, die über C-1 - C-4 bzw. über C-1 - C-6 verknüpft sind, zeigten charakteristische Unterschiede in den Fragment-Ionenintensitäten. Dagegen lassen sich aus dem FI-Spektrum der permethylierten Raffinose nicht alle Verknüpfungsarten entnehmen. Für zukünftige Untersuchungen thermisch labiler Substanzen eignet sich die Felddesorptionsmethode besser als die Methode der Probenverdampfung aus einem Ofen mit anschließender Feldionisation.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 80 (1968), S. 88-88 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 7 (1968), S. 85-85 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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