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Application of Biolayer Interferometry (BLI) for Studying Protein-Protein Interactions in Transcription
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Surface plasmon resonance ellipsometry based sensor for studying biomolecular interaction.

Rakesh Singh Moirangthem1, Yia-Chung Chang, Shih-Hsin Hsu

  • 1Department of Engineering and System Science, National Tsing Hua University, Hsinchu, Taiwan.

Biosensors & Bioelectronics
|June 16, 2010
PubMed
Summary

This study introduces a simplified surface plasmon resonance (SPR) ellipsometry technique for biomolecular interaction analysis. The method offers high sensitivity and reduced sample volume, enabling label-free, non-destructive biosensing.

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Area of Science:

  • Biophysics
  • Biosensing Technology
  • Surface Science

Background:

  • Biomolecular interactions are crucial in biological processes.
  • Conventional surface plasmon resonance (SPR) methods can be complex and require significant sample volumes.
  • Developing sensitive, user-friendly biosensors is essential for research and diagnostics.

Purpose of the Study:

  • To develop a simplified SPR ellipsometry technique for investigating biomolecular interactions.
  • To enhance sensitivity and reduce sample volume requirements in SPR-based biosensing.
  • To demonstrate the technique's capability for label-free, real-time monitoring of biological processes.

Main Methods:

  • Utilized a surface plasmon resonance (SPR) ellipsometry setup with a dove prism and micro-fluidic flow cell.

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Last Updated: Jun 12, 2026

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Published on: July 26, 2019

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  • Recorded ellipsometry data (Psi and Delta) as sensor signals to monitor biomolecular interactions.
  • Performed spectroscopic and dynamic measurements to assess bulk sensitivity and real-time surface property changes.

    • Main Results:

    • Achieved an index resolution of approximately 1.64x10^-6, surpassing conventional SPR methods.
    • Demonstrated sufficient sensitivity to detect changes in the effective thickness of biomolecular layers.
    • Successfully monitored protein adsorption and protein-protein interactions through optical responses.

    Conclusions:

    • The simplified SPR ellipsometry technique is effective for studying biomolecular interactions.
    • This non-destructive, label-free method offers high sensitivity and sub-nanometer resolution.
    • The technique shows promise for developing cost-effective and user-friendly biosensors.