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ELIME (Enzyme Linked Immuno Magnetic Electrochemical) Method for Mycotoxin Detection
Published on: October 23, 2009
Self-assembled monolayer based impedimetric platform for food borne mycotoxin detection
Pratima Rathee Solanki1, Ajeet Kaushik, T Manaka
1Department of Science and Technology Centre on Biomolecular Electronics, National Physical Laboratory (Council of Scientific Industrial Research), Dr K. S. Krishnan Marg, New Delhi, 110012, India. bansi.malhotra@gmail.com.
Nanoscale
|October 19, 2010
Summary
A novel biosensor using self-assembled monolayers detects ochratoxin-A (OTA) in food. This electrochemical method enhances antibody immobilization for sensitive mycotoxin detection in coffee samples.
Area of Science:
- Electrochemistry
- Biosensor Technology
- Food Safety Analysis
Background:
- Ochratoxin-A (OTA) is a prevalent foodborne mycotoxin.
- Accurate detection methods are crucial for food safety.
Purpose of the Study:
- To develop and characterize an electrochemical immunosensor for sensitive ochratoxin-A detection.
- To investigate the effect of self-assembled monolayers on antibody immobilization and sensor performance.
Main Methods:
- Fabrication of a gold electrode with a self-assembled monolayer of 11-amino-1-undecanethiol (AUT).
- Co-immobilization of anti-ochratoxin-A antibodies (AO-IgGs) and bovine serum albumin (BSA).
- Characterization using SEM, CV, DPV, and EIS.
Main Results:
- AUT-SAM facilitated improved AO-IgGs orientation and enhanced electron transport.
- The sensor showed a linear response to OTA from 0.5-6.0 ng/dL.
- Achieved a detection limit of 0.08 ng/dL, response time of 30 s, and sensitivity of ~36.83 Ω/ng dl⁻¹ cm⁻².
Conclusions:
- The developed BSA/AO-IgGs/AUT/Au immunoelectrode is a sensitive and reliable platform for OTA detection.
- The sensor demonstrated potential for monitoring OTA in real food samples like coffee.
