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DNA-hosted fluorescent gold nanoclusters: sequence-dependent formation.

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  • 1Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang, People's Republic of China.

Nanotechnology
|December 11, 2012
PubMed
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DNA sequence significantly influences the creation of fluorescent gold nanoclusters (Au NCs). Cytosine-rich sequences, particularly in hairpin DNA loops, yield the brightest Au NCs, showing potential for biosensing applications.

Area of Science:

  • Nanomaterials Science
  • Biochemistry
  • Analytical Chemistry

Background:

  • Gold nanoclusters (Au NCs) are emerging as fluorescent probes.
  • DNA is a versatile scaffold for nanomaterial synthesis.
  • Controlling Au NC fluorescence is crucial for applications.

Purpose of the Study:

  • To investigate how DNA sequence affects the formation and fluorescence of Au NCs.
  • To identify optimal DNA structures for efficient fluorescent Au NC synthesis.
  • To understand the mechanism behind sequence-dependent Au NC formation.

Main Methods:

  • Synthesis of fluorescent Au NCs using various DNA hosts (hairpin DNAs, single-stranded DNAs) in aqueous solution.
  • Comparative analysis of Au NC fluorescence based on DNA loop sequence, base composition, and loop length.

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Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates
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  • Spectroscopic characterization of Au NC emission properties.

    • Main Results:

    • DNA sequence critically influences Au NC fluorescence, with cytosine-rich loops being most effective.
    • Hairpin DNA loops and single-stranded DNA structures show sequence-dependent fluorescence.
    • Au NC emission intensity is tunable by altering DNA loop length.
    • Fully matched DNA duplexes are less efficient hosts compared to hairpin or single-stranded forms.

    Conclusions:

    • DNA sequence, particularly the presence and position of cytosine, dictates Au NC fluorescence efficiency.
    • The binding nucleophilicity of DNA bases to gold ions drives sequence-dependent Au NC formation.
    • This study highlights the potential of sequence-engineered DNA-templated Au NCs for advanced biosensing and nanomaterial applications.