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Related Experiment Video

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Multi-Functional Silver Nanoparticles for High-Throughput Endospore Sensing.

Shinya Ikeno1, Takahiro Maekawa1, Noriyasu Hara1

  • 1Department of Biological Functions Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan.

Biosensors
|February 24, 2022
PubMed
Summary

This study presents a novel method for detecting bacterial endospores using functionalized silver nanoparticles. The technology offers sensitive, dual detection of dipicolinic acid (DPA), a key endospore marker, for improved food and pharmaceutical safety.

Keywords:
dipicolinic acidendosporefunctional silver nanoparticlessurface-enhanced Raman scatteringterbium complex

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Area of Science:

  • Microbiology
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Spore-forming bacteria like Bacillus and Clostridium produce endospores for survival.
  • Endospores pose risks in food and medicine, necessitating detection technologies.
  • Dipicolinic acid (DPA) is a specific molecular marker for bacterial endospores.

Purpose of the Study:

  • To develop a sensitive detection method for bacterial endospores.
  • To utilize surface-enhanced Raman scattering (SERS) and fluorescence for endospore detection.
  • To construct functionalized nanoparticles for specific DPA binding.

Main Methods:

  • Construction of Fe3O4/Ag core-shell functional silver nanoparticles.
  • Specific binding of nanoparticles to dipicolinic acid (DPA).
  • Qualitative detection of DPA using SERS and quantitative detection using a terbium complex fluorescence method.

Main Results:

  • The constructed nanoparticles enabled sensitive detection of DPA.
  • Fluorescence detection quantified spore-derived DPA.
  • SERS achieved detection at concentrations in the tens of nanomolar (nM).

Conclusions:

  • Functionalized nanoparticles provide both qualitative and quantitative detection of DPA.
  • This technology is promising for endospore detection in food and pharmaceutical production.
  • The method enhances safety by enabling early detection of potential contamination.