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Colorimetric protein assay techniques.

C V Sapan1, R L Lundblad, N C Price

  • 1NABI, 5800 Park of Commerce Boulevarde, NW, Boca Raton, FL 33487, USA.

Biotechnology and Applied Biochemistry
|March 17, 1999
PubMed
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New colorimetric protein assays offer improved sensitivity but require careful standard selection for biopharmaceutical analysis. Matching the standard to the sample is crucial for accurate protein concentration determination.

Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Biopharmaceutical Analysis

Background:

  • Colorimetric protein assays have advanced significantly over the last two decades.
  • These techniques are increasingly used for biopharmaceutical characterization.

Purpose of the Study:

  • To review advances in colorimetric protein assay techniques.
  • To evaluate their suitability for biopharmaceutical applications.
  • To highlight critical considerations for accurate protein determination.

Main Methods:

  • Review of established colorimetric protein assays: Bradford, Lowry, bicinchoninic acid (BCA), and biuret assays.
  • Comparison of assay advantages and disadvantages regarding sensitivity, accuracy, and reproducibility.
  • Discussion of standard selection and alternative methods for complex mixtures.

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Main Results:

  • Each reviewed assay presents unique strengths and weaknesses.
  • Assay performance varies based on sensitivity, ease of use, and reproducibility.
  • The choice of a representative standard is paramount for accurate calibration.

Conclusions:

  • Selecting an appropriate standard that mirrors the sample's protein composition is critical for biopharmaceutical analysis.
  • When standard matching is not feasible, assays insensitive to protein composition (e.g., micro-Kjeldahl, amino acid analysis, biuret) are preferred.
  • For complex mixtures, specific protein assays or antibody-based methods may be more informative than general protein determination.