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Integrated graphene quantum dot decorated functionalized nanosheet biosensor for mycotoxin detection.

Hema Bhardwaj1,2, Christophe A Marquette3, Priyanka Dutta1,2

  • 1CSIR-National Physical Laboratory, Dr. KS Krishnan Marg, New Delhi, 110012, India.

Analytical and Bioanalytical Chemistry
|August 16, 2020
PubMed
Summary

This study developed a novel electrochemical biosensor using graphene quantum dots (GQDs) on molybdenum disulfide (MoS2) nanosheets for detecting aflatoxin B1 (AFB1). The biosensor achieved a low detection limit, demonstrating its potential for food safety applications.

Keywords:
Aflatoxin B1Electrochemical impedance spectroscopyGraphene quantum dotsImmunosensorMolybdenum disulfide

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Biosensors

Background:

  • Molybdenum disulfide (MoS2) nanosheets decorated with graphene quantum dots (GQDs) act as effective electrode materials.
  • Enhancing electrochemical performance is crucial for sensitive analyte detection systems.

Purpose of the Study:

  • To develop an electrochemical biosensor for detecting aflatoxin B1 (AFB1).
  • To utilize MoS2 nanosheets decorated with GQDs as the active electrode material.
  • To immobilize AFB1 antibodies for specific immunosensing.

Main Methods:

  • Fabrication of a biosensor using CTAB-exfoliated MoS2 nanosheets decorated with GQDs.
  • Electrophoretic deposition of MoS2@GQDs film on an ITO-coated glass surface.
  • Immobilization of AFB1 antibodies using a crosslinker for electrochemical detection.

Main Results:

  • The biosensor detected AFB1 in the range of 0.1 to 3.0 ng/mL with a detection limit of 0.09 ng/mL.
  • Calculated electrochemical parameters include a diffusion coefficient of 1.67 × 10^-5 cm²/s and HET of 2 × 10^-5 cm/s.
  • The MoS2@GQDs conjugation provided enhanced electrocatalytic activity and conductivity, leading to excellent biosensing performance.

Conclusions:

  • The developed MoS2@GQDs-based electrochemical biosensor demonstrates high sensitivity and specificity for AFB1 detection.
  • The biosensor showed good performance in detecting AFB1 in spiked maize samples with high recovery rates (80.2-98.3%).
  • This work highlights the potential of MoS2@GQDs composites for advanced electrochemical biosensing applications.