Journal of the Mass Spectrometry Society of Japan
Online ISSN : 1880-4225
Print ISSN : 1340-8097
ISSN-L : 1340-8097
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Volume 39, Issue 4
Displaying 1-2 of 2 articles from this issue
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REGULAR PAPERS
  • FAB Mass Spectral Analysis of Methylated β-Cyclodextrins
    Shizuyo HORIYAMA, Wasuke KAMISAKO, Yoko KUBOTA, Kyoko KOIZUMI, Katsuyo ...
    1991 Volume 39 Issue 4 Pages 183-191
    Published: 1991
    Released on J-STAGE: July 20, 2007
    DOIhttps://doi.org/10.5702/massspec.39.183
    JOURNAL FREE ACCESS
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    Methylation of β-cyclodextrin (β-CD, cyclomaltoheptaose) gave under basic conditions a complicated mixture containing 16 partially methylated products. Thus the components were separated by repeated chromatography. Various matrices were examined to obtain intense signals of their molecular ion species under FABMS conditions, and m-nitrobenzylalcohol was found to be the most suitable matrix. In order to determine the structures of the three positional isomers of partially methylated β-CDs (1, 2 and 3) with the nominal molecular weight 1358 and abbreviated as 5D2T-β-CD, the fragmentation based on the cleavage of the glycosidic bonds were carefully examined by B/E-constant linked scanning and tandem mass spectrometry.
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  • Ion-Molecule Reactions in C3H6 and C2H4 Systems Studied by Fourier Transform Ion Cyclotron Resonance (FT-ICR) Spectrometry
    Hisao KATAKURA, Masao INOUE
    1991 Volume 39 Issue 4 Pages 193-198
    Published: 1991
    Released on J-STAGE: July 20, 2007
    DOIhttps://doi.org/10.5702/massspec.39.193
    JOURNAL FREE ACCESS
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    The ion-molecule reactions in C3H6 and C2H4 systems are studied by Fourier transform ion cyclotron resonance (FT-ICR) spectrometry. The ejection technique is used to elucidate complex ion-molecule reactions in C3H6 and C2H4. All the ions except the specific reactant ions are ejected from the cell so that the reactions of selected ions with the parent gas molecules can be examined. In the C3H6 system two secondary reactions: C3H7++C3H6→C4H9++C2H4 and C4H7++C3H6→C5H9++C2H4 and in the C2H4 system a secondary reaction: C3H5++C2H4→C5H7++H2 are identified and their relative rate constants are determined from measurements of the reactant and product ion intensities as a function of reaction time in the cell.
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