A simple colorimetric method for the estimation of plasma biliverdin.

Area of Science:

• Biochemistry
• Clinical Chemistry
• Analytical Chemistry

Background:

• Biliverdin is a key bile pigment.
• Accurate quantification of biliverdin is crucial for diagnosing certain liver conditions.
• Existing spectrophotometric methods have limitations in sensitivity and selectivity.

Purpose of the Study:

• To develop and describe a new, sensitive, and selective colorimetric method for biliverdin assay.
• To evaluate the method's performance compared to existing techniques.
• To apply the method in a clinical setting.

Main Methods:

• A colorimetric assay based on the reaction of biliverdin with barbituric acid.
• Comparison of the new method with direct spectrophotometric measurements.
• Application of the assay to biological fluid samples.

Main Results:

• The new colorimetric method demonstrates improved sensitivity and selectivity for biliverdin.
• The assay successfully detected biliverdin in biological fluids.
• Biliverdinaemia was identified in two patients with obstructive jaundice of malignant origin.

Conclusions:

• The barbituric acid-based colorimetric method provides a reliable tool for biliverdin quantification.
• This assay enhances diagnostic capabilities for conditions involving elevated biliverdin levels.
• The method's sensitivity is particularly valuable in clinical diagnostics.