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Fluorescently labelled multiplex lateral flow immunoassay based on cadmium-free quantum dots.

Natalia V Beloglazova1, Aleksander M Sobolev1, Mickael D Tessier2

  • 1Ghent University, Faculty of Pharmaceutical Sciences, Laboratory of Food Analysis, Ottergemsesteenweg 460, 9000 Ghent, Belgium; Saratov State University, Chemistry Faculty, Department of General and Inorganic Chemistry, Astrakhanskaya 83, 410012 Saratov, Russia.

Methods (San Diego, Calif.)
|January 28, 2017
PubMed
Summary

Environmentally friendly indium phosphide quantum dots (InP QDs) were used for a novel assay. This method enables the simultaneous detection of two mycotoxins, zearalenone and deoxynivalenol, in food samples.

Keywords:
Cadmium-freeIndium phosphide (InP)Lateral flow immunoassayMycotoxinsQD@SiO(2)Quantum dots

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Area of Science:

  • Analytical Chemistry
  • Nanotechnology
  • Biotechnology

Background:

  • Quantum dots (QDs) are effective fluorescent labels for chemical analysis.
  • Traditional cadmium-based QDs pose environmental risks.
  • Indium phosphide (InP) QDs offer a non-toxic alternative.

Purpose of the Study:

  • To develop a sensitive, simultaneous detection method for mycotoxins using eco-friendly QDs.
  • To create water-soluble InP/ZnS core/shell QDs encapsulated in silica (QD@SiO2).
  • To apply QD@SiO2 as fluorescent labels in immunoassays for multiplexed screening.

Main Methods:

  • Synthesis of water-soluble InP/ZnS core/shell QDs encapsulated in silica (QD@SiO2).
  • Development of an immunoassay utilizing QD@SiO2-labeled conjugates for multiplexed detection.
  • Simultaneous detection of zearalenone and deoxynivalenol in maize and wheat.
  • Confirmation of results using liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS).

Main Results:

  • Successful development of water-soluble QD@SiO2 nanostructures.
  • Simultaneous detection of zearalenone and deoxynivalenol achieved at distinct wavelengths.
  • Established cutoff values: 50 μg/kg for zearalenone and 500 μg/kg for deoxynivalenol in maize and wheat.
  • LC-MS/MS confirmed the accuracy of the QD-based immunoassay results.

Conclusions:

  • The developed QD@SiO2-based immunoassay provides a sensitive and rapid method for simultaneous mycotoxin detection.
  • This approach offers an environmentally friendly alternative to traditional toxic QD-based detection methods.
  • The method is suitable for screening zearalenone and deoxynivalenol in cereal crops like maize and wheat.