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Design and Development of Aptamer&#8211;Gold Nanoparticle Based Colorimetric Assays for In-the-field Applications
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Solid-phase colorimetric sensor based on gold nanoparticle-loaded polymer brushes: lead detection as a case study.

Abdul Rahim Ferhan1, Longhua Guo, Xiaodong Zhou

  • 1School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive, Singapore 637457.

Analytical Chemistry
|March 21, 2013
PubMed
Summary

We developed a novel solid-phase sensor using gold nanoparticles and a polymer brush for sensitive and selective lead detection. This innovative platform offers rapid, label-free analysis with an ultralow detection limit.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Developing sensitive and selective sensors for heavy metal detection remains a critical challenge.
  • Existing methods often suffer from interference and require complex sample preparation.
  • Gold nanoparticles (AuNPs) offer unique optical properties for colorimetric sensing.

Purpose of the Study:

  • To introduce a novel solid-phase colorimetric sensor for label-free lead detection.
  • To combine the sensing capabilities of AuNPs with the antifouling properties of polymer brushes.
  • To achieve high sensitivity, selectivity, and a low limit of detection for lead ions.

Main Methods:

  • Fabrication of a sensor by loading unmodified gold nanoparticles into poly(oligo(ethylene glycol)methacrylate) (POEGMA) brushes on glass substrates.
  • Utilizing the release of AuNPs from the polymer brush upon exposure to lead ions for colorimetric detection.
  • Performing solid-phase detection on a transparent substrate.

Main Results:

  • Achieved an ultralow limit-of-detection for lead ions at 25 pM (S/N = 3).
  • Demonstrated a wide dynamic range from 100 pM to 100 nM (R(2) = 0.987).
  • Exhibited high selectivity, being up to 1000-fold more selective to lead over other common heavy metal ions.

Conclusions:

  • The developed nanocomposite sensor offers a facile and effective platform for sensitive and selective lead detection.
  • The synergistic combination of AuNPs and POEGMA brushes provides a robust, nonfouling sensing system.
  • This solid-phase sensor enables rapid, label-free, and interference-reduced heavy metal analysis.