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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 1145-1149 
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A method that combines gas chromatography and mass spectrometry (GC/MS) for the determination of N-0923 in human and monkey plasma is detailed. This novel drug holds promise for the treatment of Parkinson's disease. Clinical use of N-0923 will result both in low peak plasma concentrations and in a short half-life; consequently, a highly sensitive method will be required. Previous methods using high-performance liquid chromatography with electrochemical detection have given reliable data in high dose studies in animals to 0.3-1.0 ng/mL in plasma but are not considered adequate for studies at clinical levels in humans. The data in this paper will show that GC/MS can offer a new direction in the determination of N-0923 in human and monkey samples, with reliable data to 25 pg/mL in plasma. This method is presented as a novel approach to the determination of N-0923, and as a starting point for further development.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A sensitive and specific assay for the quantitative determination of amphetamine, methamphetamine and desmethyldeprenyl in human plasma specimens is described. Electron capture/negative ion chemical ionization gas chromatography/mass spectrometry is used to determine the extracted plasma concentrations of the three target compounds as their N-heptafluorobutyryl derivatives. Quantitation is performed by stable isotope dilution using d6-amphetamine and d6-methamphetamine as internal standards. Selected ion monitoring of the [M - HF]- ions of both the analytes and internal standards results in minimum quantifiable limits of 0.10 ng ml-1 for both amphetamine and methamphetamine and 0.25 ng ml-1 for desmethyldeprenyl. Excellent linearity (r = 0.998) up to at least 5.00 ng ml-1 is demonstrated.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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