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Multiplexed Fluorescent Microarray for Human Salivary Protein Analysis Using Polymer Microspheres and Fiber-optic Bundles
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Spectral-domain optical coherence phase microscopy for label-free multiplexed protein microarray assay.

Chulmin Joo1, Emre Ozkumur, M Selim Unlü

  • 1Wellman Center for Photomedicine, Harvard Medical School and Massachusetts General Hospital, Boston, MA 02114, United States. jooc@ge.com

Biosensors & Bioelectronics
|August 14, 2009
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Summary

A novel laser-scanning microscopy method enables label-free detection of biomolecular interactions. This spectral-domain optical coherence phase microscopy achieves high sensitivity for studying protein-antibody binding in microarrays.

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Area of Science:

  • Biophysics
  • Biomedical Engineering
  • Optical Imaging

Background:

  • Quantitative measurement of biomolecular interactions is crucial for understanding cellular functions and therapeutic development.
  • Existing methods often require labels or lack sufficient sensitivity and resolution.

Purpose of the Study:

  • To introduce a laser-scanning quantitative imaging method for label-free detection of biomolecular interactions.
  • To demonstrate the capability of spectral-domain optical coherence phase microscopy (SD-OCPM) for sensitive and high-resolution measurements.

Main Methods:

  • Utilized a confocal interferometric microscope for depth-resolved quantitative phase measurements.
  • Developed a laser-scanning approach for high spatial resolution and phase stability.
  • Employed multiplexed protein microarrays for sensing applications.

Main Results:

  • Achieved picogram per square millimeter surface mass sensitivity.
  • Demonstrated static and dynamic detection of protein-antibody interactions.
  • Validated the sensing capability through antigen-antibody capture.

Conclusions:

  • Spectral-domain optical coherence phase microscopy is a powerful optical platform for label-free biomolecular interaction analysis.
  • The method offers high sensitivity and resolution for studying molecular binding events.
  • This technique has potential applications in diagnostics and drug discovery.