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Graphite particles induce ROS formation in cell free systems and human cells.

G Zerbi1, A Barbon, R Bengalli

  • 1Department of Chemistry, Materials, Chemical Engineering "G. Natta", Politecnico di Milano, Italy. andrea.lucotti@polimi.it.

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Summary
This summary is machine-generated.

Pure graphite nanoparticles, even without external coatings, generate reactive oxygen species (ROS). This finding highlights the inherent danger of "naked" carbonaceous particles to human health.

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Area of Science:

  • Environmental Science
  • Materials Science
  • Toxicology

Background:

  • Carbonaceous particulate matter (PM) toxicity is linked to reactive oxygen species (ROS) production.
  • PM comprises a core with organic/inorganic coatings, but the role of these coatings in ROS generation is unclear.

Purpose of the Study:

  • To investigate if "naked" carbonaceous particles can generate ROS.
  • To assess the ROS-producing capability of pure graphite particles in cell-free and in-cell systems.

Main Methods:

  • Utilized pure graphite samples of varying sizes produced by ball-milling.
  • Employed Raman spectroscopy, electron spin resonance (ESR) with spin trapping, cell viability assays, and fluorescence spectroscopy.

Main Results:

  • Pure, "naked" graphitic nanoparticles were found to catalyze electron transfer, producing superoxide ions.
  • ROS generation was dependent on particle size, with graphitic platelet edges playing a significant role.
  • These nanoparticles reduced cell viability, indicating potential health risks.

Conclusions:

  • "Naked" carbonaceous nanoparticles possess inherent ROS-generating capabilities.
  • The size and structure (e.g., edges) of graphitic particles influence their ROS production.
  • These findings underscore the potential health hazards associated with pure graphitic nanoparticles, independent of external coatings.