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Jaffe' reaction products.

D S Ng, K G Blass

    Journal of Clinical Chemistry and Clinical Biochemistry. Zeitschrift Fur Klinische Chemie Und Klinische Biochemie
    |August 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    This study investigated creatinine interactions with alkaline picrate, revealing distinct red and orange complexes. Complex formation and reduction waves were analyzed, suggesting a tri-nitro anion structure for the 2:1 complex.

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    Area of Science:

    • Analytical Chemistry
    • Electrochemistry
    • Spectroscopy

    Background:

    • Creatinine is a metabolic byproduct relevant to kidney function.
    • Alkaline picrate is used in a common assay for creatinine determination.
    • Understanding the interaction chemistry is crucial for assay accuracy.

    Purpose of the Study:

    • To characterize the complexes formed between creatinine and alkaline picrate.
    • To investigate the electrochemical behavior of these interactions.
    • To elucidate the structural aspects of the creatinine-picrate complexes.

    Main Methods:

    • Polarography was employed to study reduction waves and diffusion currents.
    • Spectrophotometry was used to identify complex absorption maxima.
    • Experiments were conducted across a range of sodium hydroxide concentrations (0.95–4.5 mol/l).

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    Main Results:

    • Formation of red 1:1 and orange 2:1 creatinine-picrate complexes, and orange 1:1:1 creatinine-picrate-hydroxide complexes.
    • Spectrophotometric identification of complexes with absorption maxima at ~490 nm (red) and ~390 nm (orange).
    • Polarographic analysis revealed three initial reduction waves, with a fourth wave appearing and dominating at higher concentrations of hydroxide and/or creatinine.

    Conclusions:

    • The study identified distinct colored complexes and their spectral properties.
    • Electrochemical data provided insights into the reduction mechanisms and structural changes.
    • A tri-nitro anion structure was proposed for the 2:1 creatinine-picrate complex based on experimental findings.