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  • Wiley-Blackwell  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Analysis of folacin by GC/MS: Structures and mass spectra of fluorinated derivatives of para-aminobenzoyl glutamic acid (1988)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 17 (1988), S. 73-79 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Simultaneous acylation/esterification of para-aminobenzoyl glutamic acid with trifluoroacetic anhydride and trifluoroethanol was attempted as part of a scheme to monitor deuterium-labeled dietary folates at nanogram levels in human subjects by GCMS. The anticipated fully-derivatized product comprised only about 10% of the reaction mixture; EI, positive ion CI and electron capture negative ion mass spectra of the major product (ca 80% yield) are consistent with a cyclic compound, most likely a lactam with a 5-membered ring. The stability and mass spectral characteristics of the cyclic compound permit differentiation of isotopically labeled species at subnanogram levels by selected ion monitoring in the electron capture negative ion mode.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200170203
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  • 2
    Electronic Resource
    Electronic Resource
    Detection of 1,3,5-triazine derivatives in crop samples by thermolysis-atmospheric pressure ionization tandem mass spectrometry (1991)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 20 (1991), S. 70-74 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Pulsed pyrolysis (Py) in combination with atmospheric pressure ionization (API) and tandem mass spectrometry was investigated as a method for detecting 1,3,5-triazine pesticide residues in agricultural matrices with minimal sample preparation. Analytes investigated were thermally stable and produced Py-API mass spectra that contained essentially only the protonated molecule. Collision-induced dissociation yielded daughter ions attributable to cleavage of the triazine ring. Limits of detection for analytes in crop samples ranged from 10-1 to 102 mg residue per kilogram of substrate, depending on the nature of both analyte and substrate.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200200205
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    Paper (German National Licenses)
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