A schematic diagram exhibits the HeLa cell death during PPT treatment using folic acid-conjugated gold nanoparticles (FA–AuNPs) and non-conjugated AuNPs.

The selective photocatalytic oxidation with O₂ as oxidant of valencene and thymol was evaluated using nanostructured TiO₂ under UV-Vis radiation at atmospheric conditions. The effect of the morphology and optical properties of TiO₂ nanotubes and aminate nanoparticles was studied. Different scavengers were used to detect the presence of positive holes (h⁺), electrons (e⁻), hydroxyl radicals (•OH), and the superoxide radical anion (O₂⁻) during the photooxidation reaction. Superoxide anion radical is the main oxidizing specie formed, which is responsible for the selective formation of nootkatone and thymoquinone using aminated TiO₂ nanoparticles under 400 nm radiation.