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Gold nanoparticle aggregation-based highly sensitive DNA detection using atomic force microscopy.

Minh-Phuong Ngoc Bui1, Taek Jin Baek, Gi Hun Seong

  • 1Department of Applied Chemistry, Hanyang University, Ansan, South Korea.

Analytical and Bioanalytical Chemistry
|May 31, 2007
PubMed
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Atomic force microscopy (AFM) enhances gold nanoparticle aggregation detection for DNA hybridization. This method offers a three-orders-of-magnitude increase in sensitivity for quantitative DNA analysis at low concentrations.

Area of Science:

  • Nanotechnology
  • Biotechnology
  • Analytical Chemistry

Background:

  • Gold nanoparticles (AuNPs) are widely used in bioassays.
  • DNA hybridization is a key process in molecular biology and diagnostics.
  • UV-vis spectroscopy is a common method for detecting AuNP aggregation.

Purpose of the Study:

  • To demonstrate the potential of Atomic Force Microscopy (AFM) as a quantitative bioanalysis tool.
  • To develop a highly sensitive method for DNA detection using AFM and AuNPs.
  • To compare the sensitivity of AFM-based DNA detection with UV-vis spectroscopy.

Main Methods:

  • Functionalizing gold nanoparticles with probe DNA for sandwich hybridization with target DNA.
  • Inducing nanoparticle aggregation upon target DNA binding.

Related Experiment Videos

  • Utilizing UV-vis spectroscopy for high concentration DNA detection (100 nM–10 µM).
  • Employing AFM to monitor nanoparticle aggregation and quantify DNA at low concentrations (10 pM–10 nM).

    • Main Results:

    • UV-vis spectroscopy showed spectral broadening and a new absorption band (>600 nm) at high DNA concentrations.
    • AFM successfully visualized and quantified nanoparticle aggregation at low DNA concentrations.
    • A linear calibration curve was established by plotting mean particle aggregate diameter against target DNA concentration (10 pM–10 nM).
    • The AFM-based method achieved a three-orders-of-magnitude higher sensitivity than UV-vis spectroscopy.

    Conclusions:

    • AFM serves as a sensitive and quantitative tool for bioanalysis, particularly for DNA detection.
    • The combination of gold nanoparticles and AFM enables highly sensitive detection of DNA hybridization.
    • This AFM-based approach significantly outperforms UV-vis spectroscopy for detecting low concentrations of target DNA.