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DNA-Gold Nanoparticle Dumbbells: Synthesis and Nanoscale Characterization.

Esraa Hijaze1, Liat Katrivas1, Zakhar Reveguk1,2

  • 1Department of Biochemistry and Molecular Biology, George S. Wise Faculty of Life Sciences, The Center for Nanoscience and Nanotechnology, Tel Aviv University, Ramat Aviv, Tel-Aviv 69978, Israel.

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|October 28, 2025
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Summary

Researchers developed a method to create gold nanoparticle (AuNP) dumbbell constructs linked by DNA. Drying these structures on surfaces caused DNA bridges to contract, altering their shape.

Keywords:
AFMDNADNA-nanoparticle dumbbellsDNA-nanotechnologyTEMnanoparticles

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Area of Science:

  • Nanotechnology
  • Bioconjugation
  • Materials Science

Background:

  • Gold nanoparticles (AuNPs) are widely used in diagnostics and therapeutics.
  • DNA is a versatile molecule for constructing nanoscale architectures.
  • Creating stable, well-defined nanoparticle conjugates is crucial for advanced applications.

Purpose of the Study:

  • To develop an efficient method for synthesizing gold nanoparticle-DNA dumbbell conjugates.
  • To investigate the structural stability and integrity of these constructs under different conditions.
  • To understand the impact of substrate deposition and drying on DNA bridge conformation.

Main Methods:

  • Synthesis of dumbbell-shaped AuNP conjugates using dsDNA with terminal thiol groups.
  • Purification of constructs via gel electrophoresis.
  • Characterization using transmission electron microscopy (TEM) and atomic force microscopy (AFM).
  • Evaluation of stability in aqueous buffers and after deposition on various substrates.

Main Results:

  • High-yield synthesis of uniform AuNP dumbbells (15/25 nm particles bridged by 38/100 bp dsDNA).
  • Constructs showed high stability in solution but partial structural collapse upon drying on solid substrates.
  • TEM imaging revealed significant contraction of dsDNA bridges (1-2 nm gaps) after deposition on carbon grids.
  • AFM imaging on polylysine-coated mica preserved native geometry, showing expected DNA lengths.

Conclusions:

  • Substrate choice and surface coating critically influence the structural integrity of DNA in dried AuNP dumbbells.
  • Accurate characterization of DNA properties in these constructs requires careful consideration of deposition and drying effects.
  • The findings are vital for reliable design and application of DNA-nanoparticle conjugates.