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Array biosensor for detection of ochratoxin A in cereals and beverages
Miriam M Ngundi1, Lisa C Shriver-Lake, Martin H Moore
1Center of Bio/Molecular Science & Engineering, Naval Research Laboratory, Washington, D.C. 20375, USA.
Analytical Chemistry
|December 30, 2004
Summary
A new biosensor rapidly detects ochratoxin A (OTA) in food and beverages. This sensitive device quantifies OTA using a competitive immunoassay, offering accurate mycotoxin detection in various food matrices.
Area of Science:
- Food safety
- Analytical chemistry
- Biosensor technology
Background:
- Mycotoxin contamination, including ochratoxin A (OTA), poses a significant risk in food and beverages.
- Minute quantities of mycotoxins necessitate highly sensitive and selective detection methods.
Purpose of the Study:
- To develop a rapid, highly sensitive, and selective array biosensor for detecting and quantifying ochratoxin A (OTA).
Main Methods:
- Development of an array biosensor employing a competitive immunoassay format.
- Utilizing immobilized OTA derivatives to compete with sample OTA for fluorescent anti-OTA antibody binding.
- Quantification based on fluorescent immunocomplex formation on a waveguide surface, with signal inversely proportional to OTA concentration.
Main Results:
- The biosensor demonstrated high sensitivity and selectivity for OTA detection.
- Analysis of OTA in buffer, cereals, coffee, and wine samples was performed.
- Detection limits for OTA in cereals ranged from 3.8 to 100 ng/g; in coffee and wine, limits were 7 and 38 ng/g, respectively.
- Simple methanol extraction without cleanup or preconcentration was sufficient for sample analysis.
Conclusions:
- The developed array biosensor is a viable tool for rapid and sensitive detection and quantification of ochratoxin A in diverse food and beverage samples.
- The method offers a practical approach for mycotoxin monitoring in food safety applications.