An automated, handheld biosensor for aflatoxin

Area of Science:

• Analytical Chemistry
• Biosensor Technology
• Food Safety

Background:

• Aflatoxins are potent carcinogenic toxins produced by fungi, posing significant risks in agriculture and as potential biological weapons.
• Current detection methods for aflatoxins can be time-consuming, require specialized equipment, or lack portability.
• There is a need for rapid, sensitive, and field-deployable methods for aflatoxin detection.

Purpose of the Study:

• To develop and characterize a new handheld, self-contained immunoaffinity fluorometric biosensor for aflatoxin detection.
• To evaluate the biosensor's sensitivity, speed, and quantitative capabilities.
• To demonstrate the versatility of the biosensor platform for detecting other analytes.

Main Methods:

• Development of an immunoaffinity fluorometric biosensor utilizing specific antibody-antigen interactions.
• Integration of electro-optical components, electronics, and miniaturized fluidics for a compact and automatic device.
• Assay validation using fluorescence detection for quantitative analysis of aflatoxin concentrations.

Main Results:

• The biosensor achieved high sensitivity, detecting aflatoxin concentrations from 0.1 to 50 parts per billion (ppb).
• Quantitative measurements were obtained in less than 2 minutes using a 1 ml sample volume.
• The device demonstrated reliability, requiring no special storage and performing approximately 100 measurements before refurbishment.

Conclusions:

• The developed biosensor provides a rapid, sensitive, and portable solution for aflatoxin detection in agricultural products.
• The technology offers potential applications in food safety monitoring and biological threat detection.
• The flexible analytic procedure allows for adaptation to detect a range of chemical and biological targets.