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Facile and controllable loading of single-stranded DNA on gold nanoparticles
1Institute of Bioengineering and Nanotechnology, 31 Biopolis Way, Singapore 138669. ybzu@ibn.a-star.edu.sg
Analytical Chemistry
|September 16, 2009
Summary
Researchers developed a simple method to load thiolated single-stranded DNA (ss-DNA) onto gold nanoparticles (NPs). This ss-DNA nanoparticle conjugate strategy offers controlled loading density and efficient hybridization for biosensing applications.
Area of Science:
- Nanotechnology
- Bioconjugation
- Materials Science
Background:
- Gold nanoparticles (NPs) are widely used in biosensing.
- Efficiently immobilizing single-stranded DNA (ss-DNA) on NPs is crucial for their application.
- Nonspecific adsorption of biomolecules can interfere with NP-based assays.
Purpose of the Study:
- To develop a facile and efficient strategy for loading thiolated ss-DNA onto gold NPs.
- To control the ss-DNA loading density on the NP surface.
- To investigate the hybridization efficiency of the resulting ss-DNA-NP conjugates.
Main Methods:
- Utilizing gold NPs stabilized by a nonionic fluorosurfactant (Zonyl FSN).
- Mixing thiolated ss-DNA with NPs in the presence of varying NaCl concentrations (up to 1.0 M).
- Incubating the mixture for 2 hours to form ss-DNA-NP conjugates.
Main Results:
- ss-DNA loading density is controllable via salt concentration.
- The fluorosurfactant layer effectively inhibits nonspecific adsorption while promoting thiolated ss-DNA attachment.
- Hybridization efficiency of 13 nm NP conjugates reaches ~60% at ss-DNA densities below 15 pmol/cm², decreasing with higher densities.
Conclusions:
- A straightforward method for creating ss-DNA-gold NP conjugates using a fluorosurfactant-stabilized system.
- The developed method allows for controlled ss-DNA surface density, impacting hybridization efficiency.
- This strategy holds promise for developing sensitive and specific DNA-based biosensors.
