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ELIME Enzyme Linked Immuno Magnetic Electrochemical Method for Mycotoxin Detection
Published on: October 23, 2009
Persistent luminescent nanoparticle-based immunochromatographic assay integrated with a smartphone device for
Aimei Zhang1, Mingzhu Liu2, Jingran Sun2
1College of Food Science and Biological Engineering, Tianjin Agricultural University, Tianjin 300392, China; Military Medical Sciences Academy, Academy of Military Sciences, Tianjin 300050, China.
Insights
This study introduces a novel dual-channel immunochromatographic assay (ICA) strip using persistent luminescent nanoparticles (PLNPs) for sensitive mycotoxin detection. The method enables rapid, quantitative point-of-care testing (POCT) for food safety.
Area of Science:
- Nanomaterials Science
- Analytical Chemistry
- Biotechnology
Background:
- Conventional fluorescent labeling methods for mycotoxin detection suffer from inconsistent signals and low quantum yield, limiting sensitivity.
- Low-abundance mycotoxin detection is crucial for ensuring food safety and preventing health risks.
- Existing methods often lack the sensitivity and specificity required for rapid, on-site analysis.
Purpose of the Study:
- To develop a highly sensitive and specific dual-channel immunochromatographic assay (ICA) strip for mycotoxin detection.
- To utilize persistent luminescent nanoparticles (PLNPs) with enhanced optical properties for improved assay performance.
- To enable quantitative point-of-care testing (POCT) for mycotoxins using smartphone-based imaging.
Main Methods:
- Synthesis of persistent luminescent nanoparticles (PLNPs) based on Zn2GeO4 (ZGO) doped with specific ions, controlling emission color (green and blue).
- Optimization of reaction pH to achieve intense luminescence and robust optical stability of PLNPs.
- Development of a dual-channel ICA strip incorporating PLNPs for simultaneous detection of AFB1 and T-2 toxin.
- Integration of smartphone imaging and an intelligent system for quantitative fluorescence signal analysis.
Main Results:
- Successfully synthesized ZGO-based PLNPs with high quantum yield and excellent optical stability, reducing background interference.
- Achieved highly sensitive detection limits for AFB1 (0.01 ng/mL) and T-2 toxin (0.02 ng/mL).
- Demonstrated quantitative POCT capabilities with smartphone-based fluorescence signal reading.
- Validated the method's practical applicability in maize samples with high recovery rates (85%-105%).
Conclusions:
- The developed dual-channel ICA strip utilizing PLNPs offers a sensitive, specific, and stable platform for mycotoxin detection.
- This approach enables rapid, quantitative, and portable point-of-care testing for mycotoxins in food safety applications.
- The integration of PLNPs and smartphone-based analysis represents a significant advancement in sensitive analytical methodologies for food contaminants.
Abstract:
Conventional multicolor fluorescent labeling has inconsistent signal and low quantum yield, restricting sensitivity for low-abundance mycotoxin detection. This study developed a dual-channel immunochromatographic assay (ICA) strip based on color-coding properties of persistent luminescent nanoparticles (PLNPs). By precisely controlling the type of doping ions in Zn2GeO₄ (ZGO) and optimizing the reaction pH, PLNPs with intense green and blue emission were successfully synthesized. The as-prepared PLNPs exhibit high quantum yield and robust optical stability, which effectively reduce background interference from ICA substrates and samples. This method specifically identifies AFB1 and T-2 toxin, with detection limits of 0.01 ng/mL (0.20 μg/kg) and 0.02 ng/mL (0.40 μg/kg), respectively. Additionally, this approach uses a smartphone for imaging and an in-house developed intelligent system to read test line fluorescence signals, enabling quantitative point-of-care testing (POCT) measurements. Testing of maize samples showed recovery rates of 85 %-105 %, confirming the practical applicability of this method in food safety detection.
