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Bulk-Effect-Free Method for Binding Kinetic Measurements Enabling Small-Molecule Affinity Characterization.

Allison M Marn1, Elisa Chiodi1, M Selim Ünlü1,2

  • 1Department of Electrical and Computer Engineering, Boston University, Office 716, Photonics Center, 8 St. Mary's Street, Boston, Massachusetts 02215, United States.

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Summary
This summary is machine-generated.

This study introduces a novel optical method for label-free kinetic binding analysis that virtually eliminates bulk effects. The technique enables accurate molecular interaction monitoring without reference channels or post-processing corrections.

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Area of Science:

  • Biomolecular interaction analysis
  • Optical biosensing
  • Label-free detection technologies

Background:

  • Label-free optical detection methods monitor molecular binding kinetics by measuring refractive index changes.
  • Bulk effects, caused by solution refractive index variations, create background noise, complicating kinetic analysis.
  • Existing technologies like biolayer interferometry and surface plasmon resonance lack inherent bulk-effect compensation or require post-processing correction.

Purpose of the Study:

  • To present a virtually bulk-effect-free method for label-free kinetic binding measurements.
  • To demonstrate a new approach using interferometric reflectance imaging sensor (IRIS) technology combined with dynamic spectral illumination engineering.
  • To enable kinetic measurements of a broader range of analytes without reference channels or computational correction.

Main Methods:

  • Utilized interferometric reflectance imaging sensor (IRIS) technology for optical label-free biomolecular interaction analysis.
  • Implemented dynamic spectral illumination engineering with tailored LED contributions to minimize bulk effects.
  • Quantified signal deviation for solution changes to assess bulk-effect reduction.

Main Results:

  • Achieved a minimal deviation in reflectivity signal (∼8 × 10-6) for a significant solution refractive index change (PBS to 1% DMSO in PBS).
  • Successfully demonstrated label-free kinetic binding of biotin-streptavidin interaction using the developed method.
  • Obtained clear binding results without employing a reference channel or computational correction.

Conclusions:

  • The presented method effectively minimizes bulk effects in label-free kinetic binding measurements.
  • The combination of IRIS and dynamic spectral illumination engineering offers a robust solution for accurate biomolecular interaction analysis.
  • This technique has the potential to expand the scope of analytes measurable in kinetic binding studies.