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Hybridization on DNA-Coated Ultrasmall Gold Nanoparticles (2 nm).
Jonas Sager1, Kateryna Loza1, Oleg Prymak1
1Inorganic Chemistry and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141, Essen, Germany.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 9, 2025
Summary
Ultrasmall gold nanoparticles were functionalized with DNA using click chemistry. This DNA functionalization enables nanoparticle connection and noncovalent modification, opening new possibilities for nanoparticle applications.
Area of Science:
- Nanotechnology
- Bioconjugation Chemistry
- Materials Science
Background:
- Ultrasmall gold nanoparticles offer unique properties for various applications.
- Developing efficient methods for DNA functionalization is crucial for creating advanced nanomaterials.
- Click chemistry provides a reliable route for bioconjugation.
Purpose of the Study:
- To functionalize ultrasmall gold nanoparticles with DNA strands via click chemistry.
- To characterize the DNA-functionalized nanoparticles and confirm DNA attachment.
- To demonstrate the potential for nanoparticle assembly and noncovalent modification using DNA hybridization.
Main Methods:
- Synthesis of azide-terminated gold nanoparticles and alkyne-terminated DNA.
- Functionalization using copper-catalyzed azide-alkyne cycloaddition (click chemistry).
- Characterization using transmission electron microscopy, UV-Vis spectroscopy, fluorescence spectroscopy, and small-angle X-ray scattering.
Main Results:
- Successful covalent attachment of 20- and 30-nucleotide DNA strands to gold nanoparticles.
- Fluorescent labeling (FAM/Cy3) allowed for DNA detection and quantification.
- Demonstrated DNA hybridization for nanoparticle connection and confirmed via FRET (Förster Resonance Energy Transfer).
Conclusions:
- Click chemistry is an effective method for DNA functionalization of ultrasmall gold nanoparticles.
- DNA hybridization enables controllable assembly and noncovalent modification of these nanoparticles.
- This approach provides versatile strategies for designing functional nanomaterials.
