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Related Experiment Videos

Nanoparticle coding: size-based assays using atomic force microscopy.

Andrew D Pris1, Marc D Porter

  • 1Ames Laboratory-USDOE, Institute for Combinatorial Discovery, and Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|August 11, 2004
PubMed
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This study introduces a novel nanoparticle assay. It uses size-encoded nanoparticles and atomic force microscopy for high-resolution imaging, enabling sensitive analyte detection.

Area of Science:

  • Nanotechnology
  • Biotechnology
  • Analytical Chemistry

Background:

  • Current assay platforms face limitations in sensitivity and multiplexing capabilities.
  • Nanoparticle-based assays offer potential for enhanced detection but require robust assembly and imaging strategies.
  • Atomic force microscopy provides high-resolution imaging crucial for nanoscale analysis.

Purpose of the Study:

  • To develop and demonstrate a novel assay platform using size-encoded nanoparticles for analyte detection.
  • To leverage atomic force microscopy and evaporative self-assembly for high-resolution imaging of nanoparticle interactions.
  • To establish a feasible bar-code strategy for sensitive and potentially multiplexed bioassays.

Main Methods:

  • Utilizing two distinct sizes of labeled nanoparticles: larger capture substrates and smaller analyte labels.

Related Experiment Videos

  • Employing evaporatively driven self-assembly to form dense nanoparticle layers.
  • Interrogating the assay platform using high-resolution atomic force microscopy to analyze nanoparticle size and binding.

    • Main Results:

    • Demonstrated the feasibility of the size-encoding bar-code strategy through concept tests.
    • Successfully visualized the binding of streptavidin-labeled gold nanoparticles (10-nm) to biotin-modified silica nanoparticles (300-nm).
    • Confirmed analyte presence by imaging the size of bound smaller nanoparticles on larger capture particles.

    Conclusions:

    • The developed assay platform is feasible for sensitive analyte detection.
    • The combination of size-encoded nanoparticles, atomic force microscopy, and evaporative self-assembly offers a promising approach for bioassays.
    • The strategy holds potential for extensive multiplexing, paving the way for advanced diagnostic tools.