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Area of Science:

  • Microbiology
  • Analytical Chemistry
  • Biotechnology

Background:

  • Bacteria release metabolites under physiological stress.
  • Identifying these metabolic responses is crucial for understanding bacterial adaptation.
  • Surface-enhanced Raman spectroscopy (SERS) shows promise for metabolite detection.

Purpose of the Study:

  • To investigate bacterial metabolic responses to osmotic stress.
  • To evaluate the use of silver and gold nanoparticles in SERS for metabolite detection.
  • To confirm the origin of adenine signals during bacterial stress.

Main Methods:

  • Selected five bacterial species and exposed them to osmotic stress using demineralized water.
  • Utilized laboratory-synthesized spherical silver and gold nanoparticles as substrates for SERS.
  • Analyzed spectral changes using a commercially available Raman instrument to detect adenine release.

Main Results:

  • Adenine, a stress indicator metabolite, was detected in the surrounding environment of stressed bacteria.
  • The adenine signal was confirmed to originate from released metabolites, not the bacterial cell wall.
  • Synthesized nanoparticles demonstrated stability and effectiveness as SERS substrates.

Conclusions:

  • The study successfully demonstrated a cost-effective SERS method for detecting bacterial stress metabolites.
  • The findings confirm the release of adenine as a response to osmotic stress.
  • The developed nanoparticle-based SERS approach is suitable for qualitative detection of bacterial metabolites.