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Related Experiment Videos

Nanogold-plasmon-resonance-based glucose sensing.

Kadir Aslan1, Joseph R Lakowicz, Chris D Geddes

  • 1Institute of Fluorescence, Medical Biotechnology Center, University of Maryland Biotechnology Institute, 725 West Lombard St, Baltimore, MD 21201, USA.

Analytical Biochemistry
|June 9, 2004
PubMed
Summary

This study introduces a novel gold nanoparticle-based glucose sensor. The sensor utilizes changes in light absorption due to nanoparticle aggregation, enabling sensitive glucose detection in various body fluids.

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Area of Science:

  • Nanotechnology
  • Biomedical Engineering
  • Materials Science

Background:

  • Noble metal nanoparticles exhibit strong light interactions via surface plasmon resonances.
  • Nanoparticle proximity induces red-shifted resonance peaks due to near-field coupling, a phenomenon exploited for sensing.

Purpose of the Study:

  • To develop a new glucose sensing approach using aggregation and disassociation of gold nanoparticles.
  • To leverage changes in plasmon absorption for sensitive and tunable glucose detection.

Main Methods:

  • Utilized 20-nm gold nanoparticles coated with high-molecular-weight dextran.
  • Aggregated nanoparticles with concanavalin A (Con A), monitoring plasmon absorption shifts.
  • Introduced glucose to competitively bind Con A, inducing nanoparticle disaggregation and altered plasmon absorption.

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Main Results:

  • Concanavalin A aggregation caused significant shifts and broadening of gold plasmon absorption.
  • Glucose addition reduced nanoparticle aggregation, leading to decreased plasmon absorption at a near-red wavelength.
  • Optimized sensor parameters including stability, pH effects, dynamic range, and observation wavelength for clinical compatibility.

Conclusions:

  • Developed a plasmonic-type glucose nanosensor based on nanoparticle aggregation dynamics.
  • Demonstrated tunable glucose response ranges by modifying dextran or Con A amounts.
  • Proposed a versatile sensing platform for monitoring diverse glucose concentrations (microM to mM) in physiological fluids.