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Gold nanoparticle aggregation for quantification of oligonucleotides: optimization and increased dynamic range.

Michael S Cordray1, Matthew Amdahl, Rebecca R Richards-Kortum

  • 1Department of Bioengineering, Rice University, Houston, TX 77005, USA. mikec@rice.edu

Analytical Biochemistry
|September 25, 2012
PubMed
Summary

This study optimized a gold nanoparticle assay for detecting nucleic acids, eliminating heating and reducing time to result. The enhanced assay offers rapid, sensitive detection at room temperature, improving point-of-care diagnostics.

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Area of Science:

  • Nanotechnology
  • Biochemistry
  • Point-of-care diagnostics

Background:

  • Gold nanoparticles (AuNPs) functionalized with oligonucleotides can detect nucleic acids via target-induced aggregation.
  • Existing AuNP aggregation assays require heating and long incubation times, limiting point-of-care applications.

Purpose of the Study:

  • To optimize AuNP aggregation assay conditions for room temperature operation.
  • To reduce assay time to result without compromising sensitivity or dynamic range.
  • To enhance the utility of AuNP-based nucleic acid detection for point-of-care use.

Main Methods:

  • Optimization of assay parameters for gold nanoparticle functionalization and target-induced aggregation.
  • Measurement of optical scattering properties of gold nanoparticle solutions.

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  • Dynamic and endpoint light scattering measurements during incubation.

    • Main Results:

    • Quantifiable nucleic acid detection achieved at room temperature within 30 minutes.
    • Linear dynamic range of 150 amol to 15 fmol for endpoint measurements.
    • Dynamic measurements expanded linear range to 50 amol to 500 fmol and reduced time to 10 minutes.

    Conclusions:

    • Optimized gold nanoparticle assay provides rapid, sensitive, and quantifiable nucleic acid detection at room temperature.
    • Eliminating the need for heating and reducing incubation time significantly improves assay feasibility for point-of-care settings.
    • Dynamic light scattering measurements offer broader dynamic range and faster results, enhancing diagnostic capabilities.