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Label-free Single Molecule Detection Using Microtoroid Optical Resonators
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Recent Advances in Real-Time Label-Free Detection of Small Molecules.

Andy Chieng1,2, Zijian Wan1, Shaopeng Wang1,3

  • 1Center for Bioelectronics and Biosensors, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA.

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|February 23, 2024
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Summary

This review covers label-free, real-time biosensing technologies for detecting small molecules. Advances in transducers offer improved sensitivity and selectivity for applications like drug development and diagnostics.

Keywords:
biosensorelectrochemical transductionlabel-freeoptical transductionpiezoelectric transductionreal-time detectionsmall molecule

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Area of Science:

  • Analytical Chemistry
  • Biotechnology
  • Materials Science

Background:

  • Small molecules (<1000 Da) are crucial in drug development, toxin sensing, and biomarker detection.
  • Existing biosensing technologies face challenges in sensitivity and selectivity for small molecules due to their size and mass.
  • Label-free techniques are preferred as labeling can alter small-molecule properties, and real-time detection is essential for diagnostics.

Purpose of the Study:

  • To review recent advancements in label-free, real-time biosensing technologies for small molecule detection.
  • To highlight the use of various transducer types in overcoming current detection limitations.
  • To address the growing demand for sensitive and selective small molecule analysis.

Main Methods:

  • Review of current literature on label-free biosensing technologies.
  • Analysis of different transducer principles (e.g., electrochemical, optical, mass-based).
  • Focus on real-time detection capabilities and performance metrics.

Main Results:

  • Emerging label-free biosensors demonstrate enhanced sensitivity and selectivity for small molecules.
  • Various transducer platforms are being optimized for small molecule detection.
  • Real-time monitoring capabilities are increasingly integrated into biosensor designs.

Conclusions:

  • Label-free, real-time biosensing technologies are advancing rapidly to meet the need for small molecule detection.
  • Transducer innovation is key to improving sensitivity and selectivity in small molecule analysis.
  • These advancements hold significant promise for applications in diagnostics, drug discovery, and environmental monitoring.