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Detection of Toxin Translocation into the Host Cytosol by Surface Plasmon Resonance
Published on: January 3, 2012
A capacitive immunosensor for detection of cholera toxin
Mahmoud Labib1, Martin Hedström, Magdy Amin
1Department of Biotechnology, Lund University, Box 124, 221 00 Lund, Sweden.
Analytica Chimica Acta
|February 3, 2009
Summary
A new flow-injection capacitive immunosensor offers highly sensitive detection of cholera toxin (CT). This biosensor achieves a lower limit of detection than ELISA and SPR methods, crucial for food safety and biowarfare defense.
Area of Science:
- Biosensing
- Analytical Chemistry
- Immunotechnology
Background:
- Biological toxins pose significant risks in food safety and biowarfare.
- There is a critical need for rapid, cost-effective, and sensitive detection methods for these toxins.
Purpose of the Study:
- To develop a highly sensitive flow-injection capacitive immunosensor for detecting cholera toxin (CT).
- To compare the sensitivity of this novel immunosensor with established methods like ELISA and SPR.
Main Methods:
- Development of a capacitive immunosensor using anti-CT monoclonal antibodies immobilized on a gold transducer.
- Utilizing self-assembled monolayers for surface functionalization.
- Comparative analysis with sandwich ELISA and surface plasmon resonance (SPR)-based immunosensors.
Main Results:
- The capacitive immunosensor demonstrated a linear response to CT from 1.0x10(-13) to 1.0x10(-10) M.
- Achieved a limit of detection (LOD) of 1.0x10(-14) M for CT.
- Outperformed ELISA (LOD 1.2x10(-12) M) and SPR (LOD 1.0x10(-11) M) in sensitivity.
Conclusions:
- The developed capacitive immunosensor system exhibits superior sensitivity for cholera toxin detection compared to ELISA and SPR.
- This advanced biosensor technology holds promise for critical applications in food safety and biodefense.
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