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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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Rare Earth core/shell nanobarcodes for multiplexed trace biodetection.

Lei Chen1, Xiaomin Li1, Dengke Shen1,2

  • 1†Department of Chemistry, iChEm (Collaborative Innovation Center of Chemistry for Energy Materials), State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai 200433, People's Republic of China.

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This study introduces a new nanobarcode system using rare earth nanoparticles for simultaneous detection of multiple biomolecules. This high-sensitivity technology enables advanced genetic analysis and clinical diagnostics.

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Area of Science:

  • Nanotechnology
  • Biomolecular Detection
  • Materials Science

Background:

  • Multiplexed detection is crucial for applications like genetic analysis and clinical diagnostics.
  • Existing technologies face limitations in simultaneous assay capabilities.
  • Novel encoding systems are needed for high-throughput biomolecule detection.

Purpose of the Study:

  • To develop a novel encoding system for multiplexed biomolecule detection.
  • To demonstrate the capability of rare earth core/shell nanoparticles as nanobarcodes.
  • To achieve high-sensitivity detection using Z-contrast imaging.

Main Methods:

  • Fabrication of multilayer rare earth core/shell nanoparticles.
  • Encoding nanobarcodes based on atomic numbers and nanostructure design.
  • Utilizing high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) for decoding.
  • Application to multiplexed DNA detection.

Main Results:

  • Successful creation of dispersible suspension arrays of nanobarcodes.
  • Demonstration of thousands of unique nanobarcodes identifiable by HAADF-STEM.
  • Achieved highly sensitive (picomole level) multiplexed detection of DNA.
  • Validated the potential of the nanobarcode system for various applications.

Conclusions:

  • The developed nanobarcode system offers a powerful platform for multiplexed, high-sensitivity biomolecule detection.
  • The rare earth core/shell nanoparticles provide a robust and scalable encoding strategy.
  • This technology has significant implications for genetic analysis, diagnostics, and drug discovery.