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A miniprotein receptor electrochemical biosensor chip based on quantum dots.

Yunong Zhao1, Juan Han2, Jing Huang1

  • 1School of Integrated Circuits, Wuhan National Laboratory for Optoelectronics, Optics Valley Laboratory, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China. huan@hust.edu.cn.

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Researchers developed a novel electrochemical biosensor using a designed miniprotein receptor and quantum dots to detect SARS-CoV-2 spike protein. This sensitive biosensor enables kinetic studies and potential for high-throughput biochip fabrication.

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Area of Science:

  • Biotechnology
  • Biosensor Technology
  • Nanomaterials

Background:

  • Protein binders offer a cost-effective, specific alternative to antibodies.
  • Development of sensitive detection methods for viral proteins is crucial.

Purpose of the Study:

  • To create an electrochemical biosensor chip utilizing a computationally designed miniprotein receptor and quantum dots.
  • To detect SARS-CoV-2 spike protein and study its binding kinetics.

Main Methods:

  • Fabrication of an electrochemical biosensor chip using lead sulfide (PbS) colloidal quantum dots (CQDs) and a SARS-CoV-2 spike miniprotein receptor (LCB).
  • Electronic labelling strategy for signal transduction.
  • Analysis of binding kinetics using the developed biosensor.

Main Results:

  • The biosensor demonstrated a linear response from 10 pg mL⁻¹ to 1 μg mL⁻¹.
  • Achieved a limit of detection as low as 3.31 pg mL⁻¹ (three-electrode system) and 9.58 fg mL⁻¹ (HEMT device).
  • Successfully performed binding kinetic studies comparable to commercial equipment.

Conclusions:

  • This work presents the first electrochemical biosensor using a computationally designed miniprotein receptor for viral protein detection.
  • It is the first reported kinetic assay performed solely with an electrochemical assay.
  • The developed QD-based miniprotein receptor biosensor is suitable for high-throughput, wafer-scale biochip fabrication.