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Novel fluoroimmunoassays for detecting ochratoxin A using CdTe quantum dots.

Jingjing Yao1, Guangxu Xing1, Junling Han2

  • 1Henan Academy of Agriculture Science/Key laboratory of animal Immunology, Ministry of Agriculture/Henan key laboratory of animal Immunology, Zhengzhou, 450002, China.

Journal of Biophotonics
|June 1, 2016
PubMed
Summary

Novel fluorescence-linked immunosorbent assays (FLISA) utilizing cadmium telluride (CdTe) quantum dots (QDs) and monoclonal antibodies (MAbs) offer a sensitive method for detecting ochratoxin A (OTA) in various samples.

Keywords:
CdTe quantum dotsFLISAfluoroimmunoassayochratoxin A

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Area of Science:

  • Analytical Chemistry
  • Biotechnology
  • Food Safety

Background:

  • Ochratoxin A (OTA) is a prevalent mycotoxin posing significant health risks.
  • Accurate and sensitive detection methods for OTA are crucial for food safety and quality control.
  • Existing detection methods may lack the sensitivity or efficiency required for widespread application.

Purpose of the Study:

  • To develop novel direct and indirect competitive fluorescence-linked immunosorbent assays (cFLISA and icFLISA) for OTA detection.
  • To utilize cadmium telluride (CdTe) quantum dots (QDs) as fluorescent labels for enhanced sensitivity.
  • To evaluate the performance and potential of these assays for OTA determination.

Main Methods:

  • Synthesis of CdTe quantum dots (QDs) with a specific emission wavelength (615 nm).
  • Preparation of high-purity monoclonal antibodies (MAbs) against OTA.
  • Coupling of OTA MAbs with CdTe QDs while preserving biological activity.
  • Establishment and validation of both cFLISA and icFLISA protocols.

Main Results:

  • The developed assays demonstrated high sensitivity with low limits of detection (LOD) for OTA (e.g., 4.15 × 10⁻³ ng/mL for icFLISA).
  • The assays exhibited wide detection ranges and excellent recovery rates (96.0-104.7%) with low coefficients of variation (CVs < 10%).
  • The successful conjugation of MAbs with CdTe QDs retained antibody activity, confirming assay reliability.

Conclusions:

  • The novel FLISA methods using MAb-conjugated CdTe QDs provide a sensitive and reliable approach for OTA detection.
  • These assays hold significant potential for the development of rapid and sensitive fluorescent immunochromatographic test strips for OTA.
  • The findings contribute to advancing food safety by offering improved tools for mycotoxin analysis.