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Sensitive, Quantitative Naked-Eye Biodetection with Polyhedral Cu Nanoshells.

Jae-Ho Kim1, Jeong-Eun Park1, Mouhong Lin1

  • 1Department of Chemistry, Seoul National University, Seoul, 08826, South Korea.

Advanced Materials (Deerfield Beach, Fla.)
|August 8, 2017
PubMed
Summary

Researchers developed a new method using copper nanopolyhedral shells on gold nanoparticles for highly sensitive, naked-eye detection of DNA and viruses. This technique offers improved signal enhancement and quantification for onsite biodetection applications.

Keywords:
Cu nanoshellsDNA detectionbiosensorsnaked-eye detectionnorovirus

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Area of Science:

  • Nanotechnology
  • Biomedical Engineering
  • Analytical Chemistry

Background:

  • Silver shell enhancement on gold nanoparticles (AuNPs) is widely used for signal amplification in biological detection.
  • Limitations of silver shell methods include poor structural control and nonspecific growth, hindering reproducibility and quantification.
  • There is a need for improved nanoparticle-based detection methods with enhanced sensitivity and specificity.

Purpose of the Study:

  • To develop a novel, highly specific nanopolyhedral copper shell overgrowth chemistry on AuNPs.
  • To utilize this new chemistry for enhanced light-scattering signals in biodetection.
  • To enable sensitive, quantitative, and naked-eye detection of DNA and viruses.

Main Methods:

  • Developed a polyethyleneimine (PEI)-mediated copper nanopolyhedral shell (CuP) overgrowth process on AuNPs.
  • Investigated the specificity and controllability of CuP formation exclusively on AuNPs.
  • Applied the CuP-enhanced AuNPs for the detection of DNA (anthrax sequence) and viruses (noroviruses).

Main Results:

  • Achieved highly specific and well-defined CuP formation on AuNPs with no nonspecific growth.
  • Demonstrated naked-eye detection of DNA down to 8 × 10-15 m and viruses (noroviruses) at 2700 copies.
  • Obtained broad dynamic ranges for detection on archetypal assay platforms.

Conclusions:

  • The PEI-mediated CuP chemistry provides a controllable platform for nanostructure synthesis and optical signal enhancement.
  • This method enables highly reliable, quantitative, and onsite naked-eye biodetection.
  • The findings advance nanoparticle-based diagnostic tools for sensitive pathogen and genetic material detection.