Due to their chemical composition, cosmetics, creams, sunscreens and tattoo inks might exhibit photocatalytic properties. Under exposure to daylight, they can generate reactive oxygen species (ROS) presenting a potential health hazard. By modifying their formulae one can render them safe.

In this context:

  • Deoderants and sunscreens contain inorganic photo-active nanoparticles, such as Al2O3, TiO2, and ZnO, and therefore
    might be toxic;
  • ESR, in combination with spin-trapping, can detect and identify ROS generated by nanoparticles;
  • Depending on the tattoo pigment, we can evaluate their toxicity as a function of type, color, or chemical composition;
  • ESR-based insights into pro-oxidant/antioxidant balance can help improve the product formula.