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Hybrid Polystyrene-Plasmonic Systems as High Binding Density Biosensing Platforms.

Charles M Darr1, Juiena Hasan2, Cherian Joseph Mathai3

  • 1Department of Chemical and Biomedical Engineering, University of Missouri, Columbia, MO 65211, USA.

International Journal of Molecular Sciences
|August 29, 2024
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Summary

Researchers developed a stable, ultra-thin polystyrene layer on plasmonic gratings for sensitive biomarker detection. This advancement enhances fluorescence signals, enabling single-molecule counting for diseases like tuberculosis and COVID-19.

Keywords:
COVID-19biosensorsfluorescenceplasmonic gratingspolystyrenesingle-molecule counting

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Area of Science:

  • Biomarker detection
  • Nanotechnology
  • Surface chemistry

Background:

  • Early detection of infectious disease biomarkers is critical for timely medical intervention and public health.
  • Current methods using plasmonic gratings are limited by biomarker binding density and surface stability.
  • Existing surfaces degrade quickly, requiring immediate use after activation.

Purpose of the Study:

  • To develop a stable, ultra-thin polystyrene layer on plasmonic gratings for enhanced biomarker detection.
  • To overcome limitations of previous binding surfaces, improving shelf-life and simplifying protocols.
  • To demonstrate single-molecule counting capabilities for disease biomarkers.

Main Methods:

  • Fabrication of an ultra-thin (<10 nm) polystyrene layer on silver plasmonic gratings with alumina.
  • Addressing poor adhesion between polystyrene and alumina for stable layer formation.
  • Utilizing enhanced fluorescence from the hybrid polystyrene-plasmonic grating structure.

Main Results:

  • The developed polystyrene layer demonstrated 63.8 times brighter fluorescence compared to commercial polystyrene wellplates.
  • Achieved stable, high-density binding surfaces suitable for sensitive biomarker detection.
  • Successfully demonstrated single-molecule counting of COVID-19 spike protein using the hybrid gratings.

Conclusions:

  • The novel hybrid polystyrene-plasmonic gratings offer a stable and highly sensitive platform for biomarker detection.
  • This technology has the potential to improve early diagnosis of infectious diseases.
  • The method enables single-molecule counting, advancing diagnostic capabilities.