alexa Modified Jendrassik--Grof method for bilirubins adapted to the Abbott Bichromatic Analyzer.
Biochemistry

Biochemistry

Biochemistry & Physiology: Open Access

Author(s): Mori L

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Abstract I describe a semi-micro method for use with a discrete analyzer, the Abbott ABA-100, requiring 75 microliter of sample for determination of both the total and direct bilirubins. This method utilizes a serum blank. It is simple and reasonably rapid. The azobilirubin formed by both the total and the direct bilirubins produces a reddish-violet color, which is measured at 550 nm. Values obtained are comparable to those by the automated Jendrassik and Grof procedure adapted by Gambino and Schreiber (total r = 0.999, direct r = 0.990). The method is linear to 300 mg/liter. Day-to-day precision (CV) for the total bilirubin was 8.8\% for a 8 mg/liter sample (n = 45) and 4.7\% for a 57 mg/liter sample (n = 46). The absorbance of hemoglobin and its derivatives (540 nm) caused a false decrease in the measured bilirubin content, the direct being more affected than the total. This problem was alleviated by the use of caffeine and acid blanks.
This article was published in Clin Chem and referenced in Biochemistry & Physiology: Open Access

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