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  • Electronic Resource  (4)
  • Analytical Chemistry and Spectroscopy  (3)
  • Aszites  (1)
  • 1
    ISSN: 1432-1289
    Keywords: Schlüsselwörter Eosinophile Gastroenteritis ; Bluteosinophilie ; Aszites ; Toxocara canis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung Ein 55jähriger Patient wurde mit unklaren abdominellen Beschwerden, Leistungsminderung, rezidivierenden Diarrhöen und Aszites auf dem Boden einer eosinophilen Gastroenteritis stationär aufgenommen. Die Symptomatik war im Verlauf des stationären Aufenthaltes spontan rückläufig, der Patient bei ambulanten Nachkontrollen beschwerdefrei. Obwohl wegen des günstigen Verlaufs eine Therapie bislang nicht durchgeführt wurde, wäre bei einem erneuten Anstieg der Eosinophilen im Blut oder einem Rezidiv der Symptomatik eine sytemische Gabe von Kortikosteroiden indiziert. Als Nebenbefund fiel bei unserem Patienten ein Antikörpertiter gegen Toxocara canis auf, es ergab sich jedoch kein Hinweis für eine aktive Erkrankung. Bei jedem Patienten mit einer eosinophilen Gastroenteritis muß eine Parasitose ausgeschlossen werden.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0887-6134
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This paper describes a method for simultaneous determination of the kinetics of the three major bile acids in man using (2,2,4,4-2H4) deoxycholic acid, (24-13C) cholic acid and (24-13C) chenodeoxycholic acid. The gas chromatographic/mass spectrometric-selected ion monitoring technique used provided complete separation of deoxycholic acid, cholic acid and chenodeoxycholic acid, which permitted simultaneous measurement of isotope ratios for all three bile acids. Since measurement of all three pool sizes and fractional turnover rates in a single experiment requires different isotopic labels for deoxycholic acid and cholic acid, we investigated the in vivo stability and applicability of (2,2,4,4-2H4) deoxycholic acid as a stable isotope marker for isotope dilution studies in man. No consistent differences were observed between deoxycholic acid pool sizes and fractional turnover rates determined in serum samples after administration of (2,2,4,4-2H4) deoxycholic acid and (24-13C) deoxycholic acid. Simultaneous administration of (2,2,4,4-2H4) deoxycholic acid (24-13C) cholic acid and (24-13C) chenodeoxycholic acid and isotope ratio measurements in serum permitted determination of pool sizes and fractional turnover rates of the three major bile acid and the 7α-dehydroxylation fraction. Pool sizes, fractional turnover rates and synthesis rates (input rates) agreed well with data obtained previously with (24-13C) labels in independent studies.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 293-296 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillarym, glass ; Complete separation of bile acids in serum from cholesterol ; Analysis time less than 15 min, adaptable to GC/MS ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The proposed combination of a rather simple procedure for sample preparation with capillary gas-liquid chromatography using a barium carbonate/polyethyleneglycol 20,000 column and a Grob-type on-column injector permits measurement of bile acids in serum with high separation efficiency, short analysis time and complete separation of bile acids from cholesterol. The method can be adapted to combined capillary gas-liquid chromatography - mass spectrometry.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 12 (1985), S. 560-564 
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Measurements of isotope ratios in organic compounds at nanomolar concentrations in biological fluids require sensitive and selective gas chromatographic/mass spectrometric methods. The efficiency of sample preparation procedures must be high and gas chromatographic conditions must assure high resolution chromatography producing narrow, intense peaks. Mass spectrometric conditions must create suitable mass fragments, preferably in the high mass range. Detection, controlled by selected ion monitoring (SIM), requires the use of small mass intervals and adequate acquisition times. However, the choice of optimal conditions is limited by the need to acquire multiple data points for the eluting compound. The effects of these variables on the precision of isotope ratio measurements have been investigated to develop an optimal method for isotope ratio measurements in serum bile acids at low concentrations (0.05-8 μmol l-1). With a 25 m × 0.32 mm fused silica capillary OV-1701 column and cold on-column injection, peak widths of 10 s were obtained. Quadrupole mass spectrometry in the electron impact ionization mode (70 eV) and selected ion monitoring (SIM)(mass interval 1/16 u, acquisition time 100 ms) allowed precise (cv 〈 1.5%) isotope ratio measurements for chenodeoxycholic, cholic and deoxycholic acid in a single run at quantities as low as 5 pmol injected on the column. SIM switching during the run permitted isotope ratio measurements (cv 〈 2.2%) for an additional six bile acids, normally detected in the serum of healthy subjects.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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