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ELIME (Enzyme Linked Immuno Magnetic Electrochemical) Method for Mycotoxin Detection
Published on: October 23, 2009
An electrochemical immunosensor for aflatoxin M1 determination in milk using screen-printed electrodes
1Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, Via della Ricerca Scientifica, 00133 Roma, Italy. laura.micheli@uniroma2.it
Biosensors & Bioelectronics
|October 6, 2005
Summary
Disposable electrochemical immunosensors were developed for detecting aflatoxin M1 (AFM1) in milk. This method offers a lower detection limit and faster analysis time compared to traditional spectrophotometric assays.
Area of Science:
- Analytical Chemistry
- Biosensors
- Food Safety
Background:
- Aflatoxin M1 (AFM1) is a toxic contaminant found in milk, posing a significant risk to public health.
- Current detection methods, such as spectrophotometric enzyme-linked immunosorbent assays (ELISA), can be time-consuming and less sensitive.
- Electrochemical immunosensors offer a promising alternative due to their high selectivity, sensitivity, and potential for rapid, on-site analysis.
Purpose of the Study:
- To develop and optimize disposable electrochemical immunosensors for the detection of AFM1.
- To evaluate the performance of these immunosensors in terms of detection limit, working range, and interference effects.
- To compare the electrochemical method with a conventional spectrophotometric ELISA for AFM1 analysis in milk.
Main Methods:
- Optimization of immunoassay parameters (antibody/antigen concentrations, buffer, pH, time, temperature) for a direct competitive ELISA.
- Fabrication of electrochemical immunosensors by immobilizing antibodies onto screen-printed electrodes (SPEs).
- Electrochemical detection using chronoamperometry at -100 mV after competitive binding of free AFM1 and HRP-conjugated AFM1.
Main Results:
- The optimized spectrophotometric ELISA showed a working range of 30-160 parts per trillion (ppt) for AFM1.
- The developed electrochemical immunosensors achieved a detection limit of 25 ppt and a working range of 30-160 ppt for AFM1 in milk.
- Studies indicated minimal interference and matrix effects, demonstrating the suitability for direct milk analysis.
Conclusions:
- Disposable electrochemical immunosensors provide a sensitive and rapid method for AFM1 detection in milk.
- The electrochemical approach offers advantages over spectrophotometric methods, including a lower detection limit and reduced analysis time.
- These findings support the use of electrochemical immunosensors for routine food safety monitoring of AFM1.
