Rapid multiple immunoenzyme assay of mycotoxins

Area of Science:

• Food Science
• Analytical Chemistry
• Toxicology

Background:

• Mycotoxins are harmful fungal metabolites contaminating food products.
• Conventional Microplate ELISA for mycotoxin detection is time-consuming, taking several hours.
• There is a need for rapid, sensitive, and accurate mycotoxin monitoring methods.

Purpose of the Study:

• To develop a rapid kinetic Enzyme-Linked Immunosorbent Assay (ELISA) for detecting three key mycotoxins.
• To quantify ochratoxin A, aflatoxin B1, and zearalenone with high sensitivity and accuracy.
• To reduce the assay duration significantly compared to traditional methods.

Main Methods:

• A modified ELISA protocol utilizing biotin with an extended spacer and a streptavidin-polyperoxidase conjugate.
• Kinetic detection of mycotoxins under non-equilibrium conditions.
• Parallel analysis of ochratoxin A, aflatoxin B1, and zearalenone.

Main Results:

• Assay duration reduced to 20 minutes for individual mycotoxins and 25 minutes for parallel analysis.
• High signal levels achieved due to optimized conjugate and biotin-spacer system.
• Recovery rates of at least 95% demonstrated for mycotoxins in water-organic extracts.
• Detection limits established: 0.24 ng/g for aflatoxin B1, 1.2 ng/g for ochratoxin A, and 3 ng/g for zearalenone.
• Successful validation in poultry products and corn samples.

Conclusions:

• The developed kinetic ELISA offers a rapid and accurate method for mycotoxin detection.
• This method significantly shortens analysis time, facilitating faster food safety assessments.
• The assay is suitable for routine monitoring of ochratoxin A, aflatoxin B1, and zearalenone in food matrices.