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  • Analytical Chemistry and Spectroscopy  (2)
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  • Analytical Chemistry and Spectroscopy  (2)
  • Chemistry  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Liquid chromatography/mass spectrometry analyses of small molecules using electrospray and fast-atom bombardment ionizationPaper presented at 10th (Montreux) Symposium on LC/MS at Cornell University, 21-23 July, 1993. (1994)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 8 (1994), S. 252-257 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Electrospray ionization and fast-atom bombardment (FAB) are both soft ionization techniques which typically give prominent molecular ions of thermally labile and highly polar molecules. These two complementary techniques were compared on the same magnetic sector mass spectrometer, a Finnigan MAT 900. Comparisons were made of sensitivity, versatility, ease of use, and most importantly for our work, structure elucidation of unknowns arising from research with agricultural chemicals. Both known standards and ‘real world’ unknowns were analyzed by liquid chromatography/mass spectrometry (LC/MS) with both interfaces. The same reversed-phase micro-LC system was used with both ionization techniques, using 0.32 mm i.d. packed capillary LC columns at flow rates of 1-2 μL/min. Improved performance in the continuous-flow FAB mode was obtained by use of a screen target. The advantages, disadvantages and similarities of these two ionization techniques are discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290080306
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Identification of metabolites of hexazinone by mass spectrometry (1983)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 10 (1983), S. 581-585 
    Details
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The metabolites of hexazinone [3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4(1H,3H)-dione] obtained in the rat and in plants were identified by mass spectrometry. Rat urine metabolites were identified from direct probe spectra obtained on metabolites separated by thin-layer chromatography. Sugarcane metabolites were identified by gas chromatography mass spectrometry of the trimethylsilyl derivatives. The major metabolic routes were found to be hydroxylation of the cyclohexyl group and demethylation. All identifications were confirmed by synthesis and direct comparison of chromatographic data and mass spectra. Hexazinone is metabolized quickly and extensively in the biological systems studied, and is relatively non-persistent in the environment.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200101102
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    Paper (German National Licenses)
    Fulltext
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