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Microplate-based screening methods for the efficient development of sandwich immunoassays
Martin Kiening1, Reinhard Niessner, Michael G Weller
1Institute of Hydrochemistry, Technische Universität München, Marchioninistr. 17, 81377 München, Germany.
The Analyst
|November 15, 2005
Summary
Developing sensitive sandwich immunoassays requires careful antibody selection. Pre-labeling detection antibodies with anti-species antibodies offers an efficient method for screening antibody pairs, improving immunoassay development.
Area of Science:
- Immunology
- Biochemistry
- Assay Development
Background:
- Antibody selection is crucial for immunoassay performance.
- Screening antibody pairs for sandwich immunoassays is challenging, especially with homologous species or cell supernatants.
- Purification of antibodies for enzyme conjugate synthesis is time-consuming.
Purpose of the Study:
- To evaluate microplate-based methods for in situ labeling of detection antibodies.
- To identify an efficient strategy for developing highly sensitive sandwich immunoassays.
- To compare different antibody labeling techniques for immunoassay development.
Main Methods:
- Tested in situ labeling methods: anti-species antibodies, Fab fragments, Protein G, and biotinylation of cell supernatants.
- Used antibodies against peanut proteins as a model system.
- Assessed antibody pair performance using signal-to-blank ratios.
Main Results:
- Preincubation of detection antibodies with labeled anti-species antibodies was the most suitable method.
- Generated diagrams comparing all possible antibody combinations.
- Compared results with covalently labeled detection antibodies.
Conclusions:
- A strategy using labeled anti-species antibodies is efficient for screening antibody pairs in sandwich immunoassays.
- This approach avoids lengthy antibody purification steps.
- Facilitates the development of highly sensitive immunoassays.