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  • 1
    Electronic Resource
    Electronic Resource
    Über die Herkunft von 3,6-Epoxyalkandisäuren im Humanurin (1984)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 1513-1518 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations on the Origin of 3,6-Epoxyalkanedioic Acids in Human UrineThe 3,6-epoxyalkanedioic acids 1-4 recently found in human urine are obviously metabolic end products of so far unknown precursors produced in the body.
    Notes: Die im Humanurin kürzlich aufgefundenen 3,6-Epoxyalkandisäuren 1-4 sind offenbar Endabbauprodukte im Körper gebildeter bisher unbekannter Vorstufen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198419840811
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Tetrahydrofuransäuren - eine neue Klasse von Verbindungen des Humanstoffwechsels (1984)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 1504-1512 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tetrahydrofuran Acids - A New Class of Compounds in Human MetabolismA previously unknown acid, tetrahydro-2,5-furandiacetic acid (3,6-epoxyoctanedioic acid) (1a) is excreted in human urine in daily rates in a 3 to 5-mg range. The homologues 2a, 3a, 4a, and 5a were also found, but they occur only in trace amounts.
    Notes: Im Humanurin wird die bisher als Naturstoff unbekannte Tetrahydro-2,5-furandiessigsäure (3,6-Epoxyoctandisäure) (1a) in täglichen Mengen von etwa 3-5 mg ausgeschieden. Höhere Homologe 2a, 3a, 4a und 5a werden ebenfalls gefunden, sie kommen aber nur in Spuren vor.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198419840810
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Identification of aromatic dihydroxy acids in biological fluids (1985)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 12 (1985), S. 59-66 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 3,5-Dihydroxyphenylpropionic acid, 3,5-dihydroxycinnamic acid and 2,3-dihydroxycinnamic acid were detected for the first time to be components of human urine. In the course of this investigation all constitutional isomers of dihydroxy-benzoic, -phenylpropionic, -phenylacetic and -cinnamic acid were synthesized. Mass spectra and retention indices of methyl and trimethylsilyl (TMS) derivatives were determined. In contrast to many other substituted aromatic compounds the mass spectra of methyl and TMS derivatives of dihydroxy aromatic acids often allow a firm distinction to be made between constitutional isomers: TMS derivatives of aromatic acids containing two hydroxy groups located in the ortho position to each other can be recognized by ions resulting from a primary cleavage reaction mainly in the side chain or ester group, followed by loss of tetramethylsilane. In methyl derivatives of 1,2,3-trisubstituted isomers, methoxy groups are lost much more easily from the ions corresponding to the benzylic cleavage than in other isomers. Methyl derivatives of dihydroxycinnamic acids containing at least one methoxy group in the ortho position to the side chain are characterized by a fragmentation reaction, corresponding to the loss of dimethyl ether. TMS and methyl derivatives of 3,5-dihydroxy aromatic acids show unique structure-specific fragmentation reactions.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200120203
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    Paper (German National Licenses)
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