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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Lipids and Lipid Metabolism 878 (1986), S. 446-449 
    ISSN: 0005-2760
    Keywords: Apolipoprotein ; Fatty acyl chain specificity ; Lipoprotein lipase ; Peptide ; Phosphatidylcholine hydrolysis
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-6903
    Keywords: Trace amines ; catecholamines ; 5HT ; plasma ; hypertensives ; GC-MS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Procedures were developed for the determination of 17 circulating amines using gas chromatography-negative ion chemical ionisation mass spectrometry. The amines were quantified against their appropriate deuterated isotopomers. The mean concentrations and ranges of catecholamines and trace amines were high compared with previous studies. In comparison with nonhypertensives, plasma from hypertensives had higher concentrations of the following amines: noradrenaline (t=4.0%); normetanephrine (t=6.1%) and metanephrine (t=1.9%). There were no significant differences between 5HT levels in plasma from hypertensives and controls. The following trace amine could be detected in variable amounts in plasma:p-tyramine,m-tyramine,p-octopamine,m-octopamine,p-synephrine,m-synephrine, and salsolinol. The trace amines melatonin,N-acetyl 5HT, tryptamine, 6-hydroxymelatonin and 5-methoxytryptamine could not be detected in plasma with limits of detection lying in the range 20–100 pg ml−1.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 309 (1981), S. 308-311 
    ISSN: 1618-2650
    Keywords: Massenspektrometrie, Funken ; Isotopenverdünnung, Genauigkeit u. Richtigkeit
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary In order to avoid the influence of sample heterogeneity, matrix effects and the non-availability of well analyzed standard samples on the precision and the accuracy of spark source mass spectrometric analysis, metal and silicate samples are dissolved chemically. For quantitative analysis, isotope dilution and calibration with standard solutions are used, whereby a precision of better than ±3% and ±8%, respectively, is obtained. This development has improved the precision by about a factor of 3 and increased the reliability of the analysis.
    Notes: Zusammenfassung Um den Einfluß der Probenheterogenität, von Matrixeffekten und des Fehlens von gut analysierten Standardproben auf die Genauigkeit und Richtigkeit der funken-massenspektrometrischen Analyse zu vermeiden, sind metallische und silicatische Proben chemisch gelöst worden. Zur quantitativen Analyse wird die Isotopenverdünnungsmethode und eine Eichung mit Standardlösungen verwendet, wobei eine Genauigkeit von besser als ±3% bzw. ±8% erreicht wird. Diese Entwicklung hat die Genauigkeit gegenüber der direkten Methode um einen Faktor von ungefähr 3 verbessert und die Zuverlässigkeit der Analyse erhöht.
    Type of Medium: Electronic Resource
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