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Related Experiment Videos

Differential-phase surface plasmon resonance biosensor.

Ying-Chang Li1, Ying-Feng Chang, Li-Chen Su

  • 1Department of Optics and Photonics, National Central University, Jhongli, Taiwan, 320.

Analytical Chemistry
|May 30, 2008
PubMed
Summary
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A novel differential-phase-sensitive surface plasmon resonance biosensor (DP-SPRB) achieves unprecedented sensitivity for detecting low concentrations of biomolecules. This advancement offers highly sensitive real-time monitoring for specific biological interactions.

Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Optoelectronics

Background:

  • Surface plasmon resonance (SPR) biosensors are crucial for label-free detection of biomolecular interactions.
  • Enhancing the sensitivity and real-time monitoring capabilities of SPR biosensors remains a key research objective.
  • Existing SPR technologies face limitations in detecting analytes at extremely low concentrations.

Purpose of the Study:

  • To propose and develop a novel differential-phase-sensitive surface plasmon resonance biosensor (DP-SPRB).
  • To analytically convert phase modulation to amplitude modulation for precise real-time detection.
  • To demonstrate the high sensitivity and real-time monitoring capabilities of the developed DP-SPRB.

Main Methods:

  • Integration of a two-frequency laser with a differential amplifier to convert phase modulation to amplitude modulation.

Related Experiment Videos

  • Utilization of envelope detection technique for real-time decoding of differential phase information.
  • Testing with sucrose-water and glycerin-water solutions to verify detection sensitivity.
  • Real-time monitoring of mouse IgG/antimouse IgG interaction to determine minimum detectable concentration.

    • Main Results:

    • Achieved a detection sensitivity of 0.00001% wt % concentration for sucrose solutions.
    • Demonstrated a minimum detectable concentration of 10 fg/mL for mouse IgG.
    • Confirmed the highest sensitivity reported to date for a surface plasmon resonance biosensor.

    Conclusions:

    • The novel DP-SPRB exhibits exceptional sensitivity for detecting biomolecular interactions at extremely low concentrations.
    • The developed sensor provides precise, real-time monitoring capabilities.
    • The limited dynamic range restricts its application to ultra-trace concentration biomolecule detection.