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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of nutrition 31 (1992), S. 91-102 
    ISSN: 1436-6215
    Keywords: methylierte Nucleobasen in Lebensmitteln ; Hydrolyse ; Festphasenextraktion ; Ionenaustauschchromatographie ; Reversed-Phase-HPLC ; Methylatednucleobases infood ; hydrolysis ; sorbentextraction ; cation exchangechromatography ; reversed-phaseHPLC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary The following method was developed for the qualitative and quantitative determination of methylated purine and pyrimidine bases in food; some RNA-rich food was also investigated. The bases were liberated from nucleic acids, nucleotides, and nucleosides by acid hydrolysis with trifluoroacetic and formic acid (1/1, V/V) at 240°C in a pressure-digestion system. Purification and fractionation of hydrolysates were achieved by sorbent extraction with an RP 18 column and a cation exchange column. The major and methylated nucleobases were determined by ion-exchange chromatography and reversed-phase-HPLC.
    Notes: Zusammenfassung Zur qualitativen und quantitativen Bestimmung der methylierten Purin- und Pyrimidinbasen in Lebensmitteln wurde eine Methode entwikkelt und exemplarisch einige RNA-reiche Lebensmittel untersucht. Die Basen aus Nucleinsäuren, Nucleotiden und Nucleosiden ließen sich durch Hydrolyse mit einem Trifluoressigsäure-Ameisensäure-Gemisch (1/1, V/V) in einem Druckaufschlußsystem bei 240°C freisetzen. Durch Festphasenextraktion mit einer Octadecyl-und einer Kationenaustauscherphase gelang die Reinigung und Fraktionierung der Hydrolysate. Die Bestimmung der Major- und methylierten Nucleobasen erfolgte mittels Ionenaustauschchromatographie und Reversed-Phase-HPLC.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0935-6304
    Keywords: Capillary gas chromatography ; Mass spectrometry ; Food analysis ; Polycyclic aromatic hydrocarbons ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Twenty eight native vegetable oils were analyzed for polycyclic aromatic hydrocarbons. Generally PAH concentrations were low, but olive oils showed significantly higher contamination by light PAH ranging from 53 to 105.6 μg/kg. Muscle and liver samples of bream from the river Elbe contained little or no detectable amounts of PAH, whereas fresh and canned oysters and mussels showed higher contaminations. Highest PAH concentrations have been determined in “smoked oysters in oil” with 75.8 μg/kg benzo[a] pyrene for the oil and 12.2 μg/kg for the oyster meat.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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