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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 343 (1973), S. 179-183 
    ISSN: 1432-2013
    Keywords: Inulin Measurement ; Ultra-Micro Method ; Sphere Attachment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A simple method using glass capillaries instead of microcuvettes for measurement of inulin in nanoliter samples is given. Inulin was determined with anthron reagent (5 or 10 nl samples +3 μl anthron reagent). Glass capillary tubes (o.d.=1 mm, i.d.=0.68 mm, length=150 mm) in which the chemical reaction took place during incubation at 56°C were directly introduced into the optical system of a Zeiss spectrophotometer PMQ II with sphere attachment and objective. Extinction was measured vertically to the axis of the capillary. The changes of extinction of 20 different capillaries with the blank at different positions was only 1.13×10−3. The exactness of measurement in the concentration range of 100 ≤ 200 ≥ 400 ≥ 750 ≥ 1500 ≥ 3000 mg-% inulin was for 5nl/3 μl: 19.8 ≥ 11.0 ≥ 6.7 ≥ 4.7 ≥ 3.0 2.2%. 10nl/3 μl: 13.0 ≥ 8.4 ≥ 5.1 ≥ 3.9%. This method of measurement may also be applicable for other colorimetric reactions with nanoliter samples.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 62 (1974), S. 711-716 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Fehleranalyse wurde für Natrium in dem Konzentrationsbereich 40–400 mVal/l, für Kalium im Bereich 0,5–40 mVal/l durchgeführt. Das Probenvolumen betrug ca. 1 nl. Für jede Meßkurve wurden 5 Meßpunkte mit je 8 Wiederholungen bestimmt. Jede Wiederholung bestand aus 3 Teilmessungen, um die Interferenzeffekte zwischen Na und K zu erfassen. Schätzung der Parameter der Ausgleichsgeraden nach der Methode der kleinsten Quadrate mit Wichtung. Test auf Linearität. Mit Hilfe des Fehlerfortpflanzungsgesetzes Rückrechnung auf Fehlerbehaftung in der Konzentration. Es ergab sich der relative Fehler für Natrium 24,8 % 〉=¦σc/c¦ ≧3,9 % und Kalium zu 25,0 % ≧¦σc/c¦ ≧5,9 % bei optimaler Einstellung des Gerätes für die jeweiligen Konzentrationsbereiche.
    Notes: Summary The analysis of error was carried out for sodium in concentrations from 40 to 400 meq/l, and for potassium in the range from 0.5 to 40 meq/1. The sample volume was about 1 nl. For each calibration curve five calibration points were measured eight times each. Each repetition was carried out by three partial measurements in order to find the interference effects between sodium and potassium. The parameters of the best straight line calculated by the method of weighted least-squares were estimated. Linearity was tested. By the low of propagation of error, the error in the calculated concentrations was estimated. At optimal settings of the instrument the relative error ranged from 25 to 4% for sodium and from 25 to 6% for potassium.
    Type of Medium: Electronic Resource
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