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Related Experiment Video

Updated: May 14, 2026

Use of Label-free Optical Biosensors to Detect Modulation of Potassium Channels by G-protein Coupled Receptors
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Use of Label-free Optical Biosensors to Detect Modulation of Potassium Channels by G-protein Coupled Receptors

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Photonic crystal biosensor based on optical surface waves.

Valery N Konopsky1, Tanya Karakouz, Elena V Alieva

  • 1Institute of Spectroscopy, Russian Academy of Sciences, Fizicheskaya, 5, Troitsk, Moscow Region, 142190, Russia. konopsky@gmail.com

Sensors (Basel, Switzerland)
|February 23, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces a label-free biosensor using photonic crystal surface waves. It accurately measures molecular binding and layer thickness without needing labels, demonstrating its versatility in biological and material science applications.

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Last Updated: May 14, 2026

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Area of Science:

  • Biophysics
  • Nanotechnology
  • Materials Science

Background:

  • Label-free biosensing is crucial for real-time molecular interaction analysis.
  • Existing methods often require sample labeling, adding complexity and cost.
  • Photonic crystals offer unique optical properties for sensitive detection.

Purpose of the Study:

  • To develop and demonstrate a novel label-free biosensor.
  • To utilize photonic crystal surface waves for precise layer thickness and refractive index measurements.
  • To validate the biosensor's performance in biological and polyelectrolyte deposition studies.

Main Methods:

  • Angular interrogation of optical surface wave resonance for adsorption detection.
  • Simultaneous critical angle measurement for independent refractive index determination.
  • In situ monitoring of molecular binding (biotin-streptavidin, IgG) and polyelectrolyte deposition (PSS/PAH).

Main Results:

  • The biosensor successfully detected biotin-streptavidin binding and IgG kinetics.
  • Accurate in situ measurement of adsorbed layer thickness was achieved.
  • Independent determination of liquid refractive index was demonstrated.
  • PSS/PAH polyelectrolyte deposition was monitored, enabling separate monolayer thickness calculations.

Conclusions:

  • The developed photonic crystal surface wave biosensor provides a robust label-free platform.
  • The device enables simultaneous, independent measurement of adsorbed layer thickness and refractive index.
  • This technology has broad applicability in biomolecular analysis and thin-film characterization.