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 43, Issue 2
Displaying 1-2 of 2 articles from this issue
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REGULAR PAPERS
  • Mass Spectrometric Study on Ion-Molecule Reaction of CF3+ with Anisole at Near-Thermal Energy
    Masaharu TSUJI, Masato AIZAWA, Yukio NISHIMURA
    1995 Volume 43 Issue 2 Pages 109-114
    Published: 1995
    Released on J-STAGE: July 20, 2007
    DOIhttps://doi.org/10.5702/massspec.43.109
    JOURNAL FREE ACCESS
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    The product ion distribution in the ion-molecule reaction of CF3+ with anisole has been determined at near-thermal energy by using an ion-beam apparatus. The major product channels are the electrophilic addition to lone-pair electrons of the oxygen atom leading to the C8H8OF3+, C6H5+, and CH3OCF2+ ions with branching ratios of 15.4±2.4, 16.7±3.0, and 17.8 ±2.7%, respectively, and the electrophilic addition to the benzene ring leading to the C8H7OF2+ ion with a branching ratio of 35.7±4.3%. The C6H5OCH3+ ion is formed by the charge transfer with a branching ratio of 14.4±1.8%. The reaction mechanism is compared with those of benzene, toluene, and non-cyclic oxygen-containing molecules.
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  • B/E Constant Linked Scan Fast Atom Bombardment Analysis of a New Type of Glycosyl Phosphosphingolipid Isolated from Edible Fungi (Mushroom)
    Akiyoshi SAWABE, Masanori MORITA, Seiji OUCHI, Tadashi OKAMOTO
    1995 Volume 43 Issue 2 Pages 115-120
    Published: 1995
    Released on J-STAGE: July 20, 2007
    DOIhttps://doi.org/10.5702/massspec.43.115
    JOURNAL FREE ACCESS
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    The structures of new type of glycosyl phosphosphingolipids (1-4) isolated from Hypsizigus marmoreus (Bunashimeji, a mushroom) were determined by B/E constant linked scan fast atom bombardment (FAB) mass spectrometry. Each molecular species has common to a phytosphingosine (4-hydroxy-C18-sphinganine) in the long-chain base, phosphodihexose group, and a fatty acid of the difference of carbon numbers. The alkyl chains of fatty acids are determined to be 2-hydroxyoctadecane, 2-hydroxyhexadecane, 2-hydroxytetracosane, and 2-hydroxydocosane for 1-4, respectively. The ions of m/z 421 and 720 in the negative ion mode analyses are assigned to be characteristic of a phosphodihexose and a phytosphingosine containing phosphodihexose, respectively.
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