Related Experiment Videos
Jaffe' reaction products
Journal of Clinical Chemistry and Clinical Biochemistry. Zeitschrift Fur Klinische Chemie Und Klinische Biochemie
|August 1, 1986
Summary
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.
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).
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.