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  • (M. sexta)  (1)
  • Dermal absorption of styrene vapours  (1)
  • High performance gas chromatography  (1)
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  • 1
    ISSN: 1432-0738
    Keywords: Metabolites of toluene, xylene, styrene ; Benzoic, 3-and 4-methyl-benzoic acids ; Mandelic acid ; High performance gas chromatography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In der Arbeit wird die Gesamtbestimmung von Benzoesäure, 3-und 4-Methylbenzoesäure sowie Mandelsäure im Harn mit der Gaschromatographie (G.C.) dargestellt. Das analytische Verfahren umfaßt die Addition des inneren Standards β-Naphthol zur Harnprobe, die alkalische Hydrolyse, die Harnextraktion mit Äthyläther, das Lösungsmittelabdämpfen sowie die Silylierung der trockenen Rückstände (von Säuren) mit dem Gemisch Silyl-8-Pyridin (1 ∶ 1). Die Ergebnisse werden anhand der Relationen aus den Peakflächen der zu bestimmenden Metaboliten und dem inneren Standard (Standardabweichung) berechnet. Die Genauigkeit der erarbeiteten Methode beträgt bei der Bestimmung der genannten Säuren ±8%.
    Notes: Abstract The determination of benzoic, 3-and 4-methylbenzoic, and mandelic acids in urine by gas chromatography (G.C.) is presented. The analytical procedure includes: addition of internal standard (β-naphthol), alkaline hydrolysis, ethyl ether extraction, evaporation of the solvent, and silylation of acids with Silyl-8 in pyridine (1∶1). The results are calculated from ratios of the internal standard and determined metabolites peak surface areas. The coefficient of variation of the method in determination of mentioned acids is ±8%.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    ISSN: 1432-1246
    Keywords: Styrene in the air ; Dermal exposure ; Metabolites in urine ; Dermal absorption of styrene vapours
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Four volunteers were exposed dermally to styrene vapours within the concentration range of 1300 to 3200 mg/m3. The increase in the levels of mandelic and phenylglyoxylic acids in urine after exposure was strongly noticeable. The dermal vapour absorption coefficient (α) was calculated: for styrene it was ca. 0.022 m3/h. It was calculated that the dermal absorption of the styrene vapours contributed about 5% to the amount absorbed in the respiratory tract under the same conditions.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0005-2736
    Keywords: (M. sexta) ; ATPase, H^+- ; Insect midgut ; Vacuolar H^+-ATPase ; cDNA cloning
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
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