Protein analysis with bicinchoninic acid.

Area of Science:

• Biochemistry
• Analytical Chemistry

Background:

• The bicinchoninic acid (BCA) assay is a common method for protein quantification.
• Interferences from various substances can affect the accuracy of the BCA assay.
• Accurate protein measurement is crucial in biological and clinical research.

Purpose of the Study:

• To investigate variables affecting protein reaction kinetics with BCA.
• To reduce interferences from glucose, ascorbic acid, and uric acid in the BCA assay.
• To adapt the BCA assay for automated analysis of protein in physiological fluids.

Main Methods:

• Studied reaction kinetics of proteins with bicinchoninic acid (BCA).
• Implemented a two-point assay and incorporated borate ions to mitigate interferences.
• Compared the optimized BCA method with Coomassie blue and turbidimetric assays.

Main Results:

• Significant reduction in interferences from glucose, ascorbic acid, and uric acid was achieved.
• The modified BCA assay demonstrated suitability for automation.
• The method showed good agreement with established protein assays and higher sensitivity to globulins than albumins.

Conclusions:

• The optimized BCA assay provides a robust and sensitive method for protein quantification.
• The assay is well-suited for analyzing protein concentrations in complex biological matrices like cerebrospinal fluid and cell cultures.
• This enhanced BCA method facilitates automated protein analysis in various research and clinical settings.