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Latex-based thin-layer immunoaffinity chromatography for quantitation of protein analytes
S Birnbaum1, C Udén, C G Magnusson
1Department of Pure and Applied Biochemistry, University of Lund, Sweden.
Analytical Biochemistry
|October 1, 1992
Summary
This study introduces a fast protein antigen test using monoclonal antibodies (Mabs) and latex particles. The assay provides quick, sensitive, and quantitative results for human chorionic gonadotropin detection.
Area of Science:
- Immunology
- Biochemistry
- Analytical Chemistry
Background:
- Protein antigen detection is crucial in diagnostics.
- Existing methods can be time-consuming or require large sample volumes.
Purpose of the Study:
- To develop a rapid, sensitive, and quantitative immunochromatographic assay for protein antigens.
- To utilize a "sandwich" assay format with monoclonal antibodies (Mabs) for enhanced specificity.
Main Methods:
- A "sandwich" immunoassay format was employed using Mabs.
- Mabs were immobilized on a membrane and conjugated to blue latex particles.
- Capillary action facilitated sample migration and antigen-Mab complex formation.
- Color intensity in the detection zone was measured for quantification.
Main Results:
- The assay provides qualitative and quantitative analysis of protein antigens.
- Analysis is completed in under 10 minutes with a small sample volume (4 microliters).
- A detection limit below the nanomolar range was achieved for human chorionic gonadotropin.
Conclusions:
- This immunochromatographic method offers a rapid and sensitive approach for protein antigen detection.
- The assay is suitable for quantitative analysis with high sensitivity.
- The method demonstrates potential for quick diagnostic applications.