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 40, Issue 2
Displaying 1-5 of 5 articles from this issue
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REVIEW
REGULAR PAPERS
  • Liquid Ionization Mass Spectrometric Identification of Nucleic Acid Bases in the Products of Prebiotic Synthesis
    Rei HASEGAWA, Kensei KOBAYASHI, Takeo KANEKO, Masahiko TSUCHIYA
    1992 Volume 40 Issue 2 Pages 107-114
    Published: 1992
    Released on J-STAGE: July 20, 2007
    DOIhttps://doi.org/10.5702/massspec.40.107
    JOURNAL FREE ACCESS
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    Nucleic acid bases in products by proton irradiation of a simulated primitive atmosphere were identified by liquid ionization (LI) mass spectrometry. In order to detect a trace amount of nucleic acid bases, the LI ion source setting was improved in terms of ionization efficiency and ion focusing. The new ion source provided better sensitivity for the analyte (uracil) and lower background of water clusters than the previous one. Addition of a certain amount of a standard compound such as adenine (1 mM) and a kind of matrix (0.2% glycerol) improved the detection limit and the linearity of calibration curves.
    When a mixture of carbon monoxide, nitrogen, and water (“a simulated primitive earth atmosphere”) was irradiated with high energy protons, and the nucleic acid bases in the product were analyzed. Uracil, one of the five nucleic acid bases, was identified by LI mass spectrometry using the improved ion source.
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  • Analyses of Land-Derived Organic Matter in Recent Sediment by Chemical Degradation/Gas Chromatography Mass Spectrometry
    Ryoshi ISHIWATARI, Kohei USHIKUBO, Minoru UZAKI
    1992 Volume 40 Issue 2 Pages 115-129
    Published: 1992
    Released on J-STAGE: July 20, 2007
    DOIhttps://doi.org/10.5702/massspec.40.115
    JOURNAL FREE ACCESS
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    Alkaline CuO degradation products of a recent lacustrine sediment were analyzed by gas chromatography mass spectrometry. (1) Approximately 80 compounds were identified in the degradation products. They include C10~C32 fatty acids, C18~C32 fatty alcohols, C4~C9 and C16~C28 α ω-dicarboxylic acids, C16~C30 ω-hydroxy acid, lignin-derived phenolics (vanillyl phenols, syringyl phenols, p-coumaric and ferulic acids), and cutin-derived acids (9,16- and 10,16-dihydroxyhexadecanoic acids, 8-hydroxyhexadecan-1,16-dioic acid, 9,10,18-trihy-droxyoctadecanoic acid, and 9,10-dihydroxyoctadecan-1,18-dioic acid). (2) Dimers of vanillyl phenols were inferred to be present in the degradation products. (3) Alkaline CuO oxidation method was concluded to be very powerful for tracing land-derived organic matter in the aquatic environment.
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  • GC/MS Analysis of Marine- and Vegetation-derived Organics in the Atomosphere
    Yoko YOKOUCHI, Yoshinari AMBE
    1992 Volume 40 Issue 2 Pages 131-136
    Published: 1992
    Released on J-STAGE: July 20, 2007
    DOIhttps://doi.org/10.5702/massspec.40.131
    JOURNAL FREE ACCESS
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    Naturally derived organics in the atmosphere (isoprene, dimethyl sulfide, and bromocarbons) were analyzed with a combination of adsorptive sampling and capillary GC/MS, where a Poraplot Q column was used to avoid difficulties accompanying cryogenic focus on the capillary column. Their detection limits were 2 pg for bromocarbons, 5~10 pg for isoprene and dimethyl sulfide. Diurnal variations of their concentrations were observed in Iriomote Island in March of 1991.
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  • Identification of Metabolites of Organotin Compounds in Mussel by GC/MS
    Hiroaki Shiraishi, Takuo Higashiyama, Shinya Hashimoto, Akira Otsuki
    1992 Volume 40 Issue 2 Pages 137-146
    Published: 1992
    Released on J-STAGE: July 20, 2007
    DOIhttps://doi.org/10.5702/massspec.40.137
    JOURNAL FREE ACCESS
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    Metabolic products of organotin compounds in mussel were studied by using gas chromatography/mass spectrometry (GC/MS). Organotin compounds in mussels collected along Tokyo bay were extracted with 1 N HBr ethanol solution and benzene mixture in presence of tropolone. The extracts were propylated with Grignard reagent before GC and GC/MS analysis. The existence of butyltin, dibutyltin, tributyltin, phenyltin, diphenyltin, triphenyltin in the extracts was shown by FPD gas chromatography. Several unidentified compounds, which responded well to FPD detector, were subject to GC/MS analysis after fractionations by silica gel column chromatography, subsequent by high performance liquid chromatography. Compounds identified by GC/MS were as follows; dibutyl(3-oxobutyl)tin, butyl(3-oxobutyl)tin, dibutyl(3-hydroxybutyl)tin, and butyl(3-hydroxybutyl)tin. These identifications were confirmed by synthesis of authentic standards. Butyltin compounds, found in this study, are also known as metabolic products of tributyltin in mammals. Oxidation of tributyltin to dibutyl(3-oxobutyl)tin seems to be favored in mussel, while debutylation is favored in mammals. In summer, dibutyl(3-oxobutyl)tin becomes one of the major organotin compounds in mussel.
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