A collaborative study to validate novel field immunoassay kits for rapid mycotoxin detection

Area of Science:

• Food Safety
• Analytical Chemistry
• Mycotoxicology

Background:

• Mycotoxins like ochratoxin A (OA) and T-2 toxin pose significant risks in cereal grains.
• Accurate and accessible detection methods are crucial for ensuring food safety and quality.
• Enzyme immunoassays offer a potential rapid screening tool for these contaminants.

Purpose of the Study:

• To collaboratively evaluate the performance of membrane-based flow-through enzyme immunoassay kits for detecting ochratoxin A and T-2 toxin.
• To assess the reliability of these kits in screening various cereal types (wheat, rye, maize, barley).
• To determine the limits of detection and accuracy of the kits compared to established analytical methods.

Main Methods:

• Collaborative study involving 10 laboratories over two stages.
• Use of enzyme immunoassay kits with methanol-based extraction, filtration, and visual colorimetric evaluation.
• Confirmation of results using high-performance liquid chromatography (HPLC) and gas chromatography-mass spectrometry (GC-MS).

Main Results:

• Limits of detection were 4 µg/kg for ochratoxin A and 50 µg/kg for T-2 toxin.
• For ochratoxin A kits, false positive and false negative rates were 2% and 4%, respectively.
• Excluding outlier results, T-2 toxin kits showed 6% false positives and 3% false negatives.

Conclusions:

• The studied enzyme immunoassay kits are suitable for the collaborative screening of cereals for ochratoxin A and T-2 toxin.
• The kits provide a reliable and efficient method for mycotoxin analysis in food safety applications.
• Further validation may be beneficial for specific T-2 toxin kit performance.