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Microparticles for selective protein determination in capillary electrophoresis
H Nilsson1, M Wiklund, T Johansson
1Center for Chemistry and Chemical Engineering, Lund University, Sweden. staffan.nilsson@teknik.lth.se
Electrophoresis
|August 25, 2001
Summary
A novel system detects trace human chorionic gonadotropin (hCG) using antibody-bound latex particles and capillary electrophoresis. This method achieves a low limit of detection for sensitive protein analysis.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Immunotechnology
Background:
- Sensitive detection of proteins like human chorionic gonadotropin (hCG) is crucial for diagnostics.
- Existing methods may lack the sensitivity or specificity required for trace-level protein detection.
Purpose of the Study:
- To develop a sensitive system for detecting trace amounts of protein.
- To utilize latex particles functionalized with monoclonal antibodies for enhanced detection.
Main Methods:
- Covalently binding two monoclonal antibodies against hCG to latex particles.
- Forming immunocomplexes by mixing latex particles with hCG-containing samples.
- Separating immunocomplexes from single latex particles using capillary electrophoresis.
- Detection via UV-Vis spectroscopy and real-time monitoring with laser-induced fluorescence-charge coupled device (LIF-CCD) imaging.
Main Results:
- Achieved a limit of detection of 8 amol hCG.
- Demonstrated successful separation and detection of immunocomplexes.
- Real-time monitoring capability using LIF-CCD imaging was established.
Conclusions:
- The developed system offers highly sensitive detection of trace proteins.
- Capillary electrophoresis combined with antibody-functionalized latex particles is effective for protein analysis.
- A limitation is the requirement for available monoclonal antibodies specific to the target protein.