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A quantitative test for copper using bicinchoninic acid

A J Brenner1, E D Harris

  • 1Department of Biochemistry and Biophysics, Texas A&M University, College Station 77843, USA.

Analytical Biochemistry
|March 20, 1995
PubMed
Summary
This summary is machine-generated.

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A new direct colorimetric assay uses 2,2'-bicinchoninic acid (BCA) for sensitive and specific copper (Cu(I)) detection in biological samples. This method offers minimal interference and strong correlation with atomic absorption spectrophotometry.

Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Clinical Diagnostics

Background:

  • Accurate copper measurement is crucial for diagnosing various health conditions.
  • Existing methods for copper quantification can be complex or require specialized equipment.
  • A need exists for a simple, sensitive, and specific assay for biological samples.

Purpose of the Study:

  • To develop and validate a direct colorimetric assay for copper determination.
  • To utilize 2,2 -bicinchoninic acid (BCA) as a sensitive reagent for Cu(I).
  • To assess the assay's performance in serum and biological samples.

Main Methods:

  • A direct colorimetric method employing 2,2 -bicinchoninic acid (BCA).
  • Measurement of absorbance at peak wavelengths (562 nm and 354.5 nm) of the copper-BCA complex.

Related Experiment Videos

  • Comparison of results with atomic absorption spectrophotometry.

    • Main Results:

    • The BCA assay demonstrated high sensitivity and specificity for Cu(I).
    • The copper-BCA complex formed an intense purple color with distinct molar absorptivities.
    • Minimal interference was observed from other metal ions, pH variations, and detergents.
    • Assay results showed strong correlation with atomic absorption spectrophotometry.

    Conclusions:

    • The developed BCA assay provides a reliable and direct method for copper quantification in biological samples.
    • This assay is suitable for routine laboratory use due to its simplicity and sensitivity.
    • The method offers a valuable alternative for clinical and research applications requiring copper level assessment.