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Dynamic Single-Molecule Sensors: A Theoretical Study.

Yuting Yang1, Qiang Zeng2, Qingqing Luo2

  • 1Department of Instrument Science and Engineering, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200030, People's Republic of China.

ACS Sensors
|June 16, 2022
PubMed
Summary
This summary is machine-generated.

This study presents a hydrodynamic model for dynamic single-molecule sensors, revealing a probe design dilemma. Applying external disturbance offers a solution to enhance sensitivity and specificity in molecular detection.

Keywords:
free energykineticssingle-moleculethermodynamicsultrasensitive

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Area of Science:

  • Biotechnology
  • Nanotechnology
  • Biophysics

Background:

  • Single-molecule sensors offer superior detection of molecular heterogeneity compared to ensemble methods.
  • Dynamic single-molecule sensing uses molecular interaction kinetics as a fingerprint for specific target detection.
  • Current limitations in theoretical modeling hinder the rational design of these ultrasensitive biosensors.

Purpose of the Study:

  • To develop a comprehensive theoretical model for dynamic single-molecule sensing.
  • To quantitatively analyze the performance and limitations of probe design in these sensors.
  • To explore strategies for overcoming design challenges and improving sensor capabilities.

Main Methods:

  • Theoretical study employing a hydrodynamic model.
  • Quantitative analysis of molecular interaction kinetics and probe affinity.
  • Investigation of external disturbance as a potential solution to design dilemmas.

Main Results:

  • A key dilemma in probe design was identified: high-affinity probes increase specificity but require long assay times, while low-affinity probes are faster but less specific.
  • The study quantitatively demonstrates this trade-off between specificity and assay time.
  • External disturbance was proposed and experimentally validated as a method to resolve this design dilemma.

Conclusions:

  • The developed hydrodynamic model provides insights into the rational design of single-molecule sensors.
  • Overcoming the probe design dilemma is crucial for improving sensor sensitivity, specificity, and multiplexing capabilities.
  • This work paves the way for advanced single-molecule sensor development through theoretical guidance and experimental validation.