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A solid-phase protein assay: quantitation of protein in the nanogram range
M W Sulter1, G J Kloosterhuis, P J Coenraads
1Department of Dermatology, State University Hospital, Groningen, The Netherlands.
Analytical Biochemistry
|June 1, 1993
Summary
A novel solid-phase protein assay (SPA) offers significantly higher sensitivity for protein concentration determination. This biotinylation-based method outperforms traditional assays and is effective even with interfering substances.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Assay Development
Background:
- Traditional protein quantification methods like Bradford and Lowry assays have limitations in sensitivity and are susceptible to interference.
- Accurate protein concentration determination is crucial for various biological and biochemical applications.
Purpose of the Study:
- To describe a novel solid-phase protein assay (SPA) for highly sensitive protein concentration determination.
- To compare the sensitivity and applicability of the SPA assay against established protein detection techniques.
Main Methods:
- Immobilization of protein on a microtiter plate solid phase.
- Biotinylation of the immobilized protein.
- Quantitation of protein-biotin complexes using peroxidase-coupled avidin.
Main Results:
- The SPA assay demonstrates 1000 to 10,000 times greater sensitivity compared to Bradford and Lowry assays for certain proteins.
- The assay is robust and effective for protein quantitation in samples containing common interfering agents.
- When combined with antigen-specific ELISA, SPA provides a reliable specific versus total protein ratio.
Conclusions:
- The developed SPA is a highly sensitive and versatile method for protein quantitation.
- SPA serves as a valuable alternative and complement to existing protein assays.
- This assay enhances the reliability of protein analysis, particularly when assessing specific protein levels within complex samples.