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  • Analytical Chemistry and Spectroscopy  (2)
  • peroxides  (2)
  • 1
    ISSN: 1436-6215
    Keywords: vitamin E ; muscular dystrophy ; protein turnover ; antioxidant ; autoxidation ; peroxides ; rabbit
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung Frühere Untersuchungen über Stoffwechselveränderungen bei Tieren mit Vitamin-E-Mangel waren oft schwer zu interpretieren, da die verwendeten PUFA-reichen Diäten Peroxide in hoher Konzentration enthalten konnten. Vermutete Wirkungen eines Vitamin-E-Mangels hätten Wirkungen des Peroxidverzehrs sein können. Durch Zugabe des nichtresorbierbaren polymeren Antioxidationsmittels Anoxomer zu einer semisynthetischen, Vitamin-E-freien, lebertranhaltigen Diät kann die Peroxidbildung unterdrückt werden. Trotzdem verursachte diese Diät nekrotisierende Myopathie, charakterisiert durch hohe Kreatinausscheidung im Urin, Muskelschwäche und erhöhte Rate der Inkorporation von [1-14C]-Glycin in die Muskelproteine. Diese Effekte wurden durch Vitamin-E-Supplementierung verhindert. Die erhöhte Turnover-Rate der Muskelproteine ist offensichtlich die Folge des Vitamin-E-Mangels, nicht die Folge des Peroxidverzehrs.
    Notes: Summary Previous studies of metabolic changes in vitamin E-deficient animals were often difficult to interpret because the vitamin E-free, high PUFA diets used in such studies may have contained high levels of peroxides. Presumed effects of vitamin E deficiency could have been effects of peroxide consumption. Addition of the non-absorbable polymeric antioxidant Anoxomer to a semisynthetic vitamin E-free diet containing cod liver oil was found to suppress peroxide formation. Nevertheless, this diet produced necrotizing myopathy, characterized by high urinary creatine excretion, muscular weakness, and increased rate of incorporation of [1-14C] glycine into muscle proteins. These effects were prevented by vitamin E supplementation. The increased rate of muscle protein turnover is obviously the result of vitamin E deficiency, not the result of consumption of dietary peroxides.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1436-6215
    Keywords: vitamin E ; protein turnover ; liver proteins ; plasma proteins ; antioxidant ; autoxidation ; peroxides ; rabbit
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung Eine erhöhte Turnover-Rate der Leberproteine, des Plasmaalbumins und der Plasmaglobulinfraktionen in Vitamin-E-frei ernährten jungen Kaninchen wurde durch In-vivo-Untersuchungen mit [1-14C]l-Leuein und [l-14C]Glycin festgestellt. Dieser Effekt trat am deutlichsten auf und war am besten reproduzierbar, wenn das Futter der Tiere 10 mg des nicht resorbierbaren polymeren Antioxidans Anoxomer pro g Fett enthielt.
    Notes: Summary As determined by in vivo studies using [1-14C]l-leucine and [1-14C] glycine, vitamin E deficiency in young rabbits caused a higher turnover rate of liver proteins and of plasma albumin and globulin fractions. This effect was most clearly and consistently observed in animals fed a diet containing 10 mg of the nonabsorbable polymeric antioxidant Anoxomer per g of fat in the diet.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 18 (1995), S. 108-110 
    ISSN: 0935-6304
    Keywords: GC/Atomic Emission Detection (GC/AED) ; Reformulated gasolines ; Selective analyses of oxygenates ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A GC method for the determination of oxygenated additives in reformulated gasolines (RFG) is described. The method uses on-column injection and atomic emission selective detection of oxygenates using the 777 nm NIR emission line. Detection limits are approximately 10 ppm oxygen. Results compared well with other techniques, such as GC/FTIR.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Raman spectra of a series of WO3—AI2O3 catalysts containing 1-30 wt-% of WO3 were investigated with respect to the effect of O2 calcination and H2O—D2O exposure. These studies showed that the frequencies of bands due to surface tungstate species can be shifted reversibly by as much as 6% of their values during alternate O2 calcination and H2O exposure cycles. The exchange of 18O for l6O in the surface tungstate was also investigated with Raman spectroscopy and ion-scattering spectrometry. The results were used to assign Raman bands to fundamental vibrations of the surface tungstate and to propose a mechanism of interaction between H2O and the surface tungstate that hitherto has not been addressed for WO3—AI2O3.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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