A Highly Sensitive Silicon-Core Quantum Dot Fluorescent Probe for Vomitoxin Detection in Cereals

Area of Science:

• Analytical Chemistry
• Biotechnology
• Food Safety

Background:

• Vomitoxin (deoxynivalenol) is a mycotoxin with significant immunosuppressive effects, posing risks to human and animal health.
• Accurate and rapid detection methods for vomitoxin in grains are crucial for food safety and quality control.

Purpose of the Study:

• To develop a novel on-site immune detection method for rapid and quantitative analysis of vomitoxin in grains.
• To synthesize and characterize a functionalized SiO2@QD fluorescent probe for enhanced sensitivity and stability.

Main Methods:

• Synthesis of SiO2@QD nanotags using polyethyleneimine (PEI) as an interlayer for functionalization and CdSe/ZnS quantum dot (QD) self-assembly.
• Preparation of a fluorescence-enhanced QD immune probe by coupling QDs with anti-DON monoclonal antibodies.
• Evaluation of probe stability, sensitivity, and performance in detecting spiked wheat flour samples.

Main Results:

• The synthesized SiO2@QD nanotags exhibited good dispersibility and high fluorescence intensity, with stable fluorescence for 90 days.
• The immuno-SiO2@QD fluorescent probe demonstrated excellent sensitivity, with a detection limit of 0.25 ng/mL.
• The probe achieved high average recovery rates (92.2-101.6%) in spiked wheat flour samples, indicating reliable quantification.

Conclusions:

• The developed immuno-SiO2@QD fluorescent probe provides a simple, rapid, and sensitive method for on-site vomitoxin detection.
• This technology holds significant potential for routine monitoring of vomitoxin contamination in grains, enhancing food safety.