Magnetic microspheres-based cytometric bead array assay for highly sensitive detection of ochratoxin A

Area of Science:

• Analytical Chemistry
• Food Safety
• Biotechnology

Background:

• Accurate mycotoxin quantification in food is crucial for public health.
• Greener analytical methods are needed to reduce environmental impact.
• Ochratoxin A (OTA) is a significant mycotoxin found in malt and other food products.

Purpose of the Study:

• To develop a green, economical, and sensitive assay for detecting ochratoxin A (OTA) in malt.
• To establish a magnetic microsphere-based cytometric bead array (CBA) assay for rapid OTA quantification.
• To demonstrate the assay's potential for on-site, real-time detection of trace contaminants.

Main Methods:

• Development of a magnetic microsphere-based cytometric bead array (CBA) assay.
• Utilized an indirect competitive principle for OTA detection.
• Employed magnetic separation and fluorescence detection with specific antibody probes.

Main Results:

• Achieved an ultralow limit of detection (0.025 μg/kg) for OTA.
• Demonstrated higher sensitivity compared to traditional polystyrene beads-based CBA methods.
• Successfully detected OTA in complex malt matrices with high accuracy and speed.

Conclusions:

• The magnetic microsphere-based CBA assay is a highly sensitive and rapid method for OTA detection in malt.
• This green protocol offers advantages in terms of reduced solvent, time, and cost.
• The developed assay shows significant potential for on-site, real-time analysis of trace components in complex samples.