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Related Concept Videos

Labeling DNA Probes03:31

Labeling DNA Probes

DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...

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Bacterial DNA Recognition by SERS Active Plasma-Coupled Nanogold.

Vasyl Shvalya1, Aswathy Vasudevan1,2, Martina Modic1

  • 1Department of Gaseous Electronics (F6), Jožef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia.

Nano Letters
|October 27, 2022
PubMed
Summary

Surface-enhanced Raman spectroscopy (SERS) identifies bacteria using genomic DNA as a unique marker. This method uses gold nanoparticles for rapid, sensitive bacterial species differentiation.

Keywords:
DNA Raman fingerprintsDNA genomic ratiocoupled plasmonic nanogoldplasma electrochemical reduction

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Area of Science:

  • Nanotechnology
  • Biotechnology
  • Spectroscopy

Background:

  • Bacterial identification is crucial for diagnostics and research.
  • Existing methods can be time-consuming or require extensive sample preparation.
  • Genomic DNA composition offers a unique fingerprint for bacterial species.

Purpose of the Study:

  • To demonstrate the efficacy of SERS for bacterial identification based on genomic DNA.
  • To develop a rapid and sensitive method for bacterial species differentiation.
  • To correlate SERS spectral data with genomic composition.

Main Methods:

  • Synthesis of nanogold aggregates via single-step plasma reduction.
  • Application of SERS with high enhancement factor (10^7) for spectral analysis.
  • Utilizing principal-component statistical analysis for spectral differentiation.
  • Genomic composition estimation via Raman mode deconvolution.
  • Validation using third-generation nanopore sequencing.

Main Results:

  • Successful spectral differentiation of bacterial species using SERS.
  • Achieved high enhancement factor enabling detection of nanogram sample quantities.
  • Simulations confirmed electric field confinement in nanogaps enhancing DNA signal.
  • Accurate estimation of nitrogenous base content (G-C and A-T percentages).
  • SERS-based genomic composition validated by nanopore sequencing.

Conclusions:

  • SERS can effectively identify bacteria by analyzing their genomic DNA.
  • The developed SERS technique offers a rapid and sensitive method for bacterial speciation.
  • This approach provides a powerful tool for swift bioentity specification.