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Polymer-coated fluorescent CdSe-based quantum dots for application in immunoassay.

Elena S Speranskaya1, Natalia V Beloglazova, Pieterjan Lenain

  • 1Department of General and Inorganic Chemistry, Chemistry Institute, Saratov State University, Astrakhanskaya 83, 410012 Saratov, Russia; Laboratory of Food Analysis, Faculty of Pharmaceutical Sciences, Ghent University, Harelbekestraat 72, 9000 Ghent, Belgium.

Biosensors & Bioelectronics
|October 22, 2013
PubMed
Summary

This study developed biocompatible cadmium selenide (CdSe) core/shell quantum dots (QDs) as fluorescent labels for immunoassays. The novel amphiphilic polymer coatings enhanced QD stability and conjugation for sensitive mycotoxin detection in food samples.

Keywords:
Amphiphilic polymersDeoxynivalenolFluorescent nanoparticlesImmunoassayQuantum dots

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Area of Science:

  • Nanotechnology
  • Biochemistry
  • Analytical Chemistry

Background:

  • Quantum dots (QDs) offer unique optical properties for bio-imaging and sensing.
  • Biocompatible and water-soluble QDs are crucial for in-vitro diagnostic applications.
  • Developing robust conjugation strategies for QDs is essential for immunoassay development.

Purpose of the Study:

  • To synthesize and characterize biocompatible CdSe core/shell quantum dots (QDs).
  • To develop novel amphiphilic polymers for QD solubilization in aqueous media.
  • To evaluate QDs as fluorescent labels in quantitative and qualitative immunoassays.

Main Methods:

  • Synthesis and characterization of CdSe core/shell QDs.
  • Modification of maleic anhydride-based polymers with Jeffamine M 1000 and Jeffamine ED-2003.
  • Assessment of polymer influence on QD optical properties, stability, and biomolecule conjugation.
  • Application of QDs in fluorescence microtiter plate immunoassay and on-site column tests.

Main Results:

  • Amphiphilic polymers enabled QD solubilization and provided carboxyl or amine functional groups for conjugation.
  • QDs coated with poly(maleic anhydride-alt-1-octadecene) and Jeffamine ED-2003 retained 90% brightness, showed easy protein conjugation, and low non-specific adsorption.
  • Successful application of QDs for deoxynivalenol determination in wheat and maize samples.

Conclusions:

  • Novel amphiphilic polymer coatings enhance the performance of CdSe QDs as fluorescent labels.
  • The developed QD-based immunoassays are effective for sensitive and specific mycotoxin detection.
  • This work provides a robust platform for QD-based biosensing applications.