Generation mechanism of hydroxyl radical species and its lifetime prediction during the plasma-initiated ultraviolet (UV) photolysis

Abstract

Through this work, we have elucidated the mechanism of hydroxyl radicals (OH^•) generation and its life time measurements in biosolution. We observed that plasma-initiated ultraviolet (UV) photolysis were responsible for the continues generation of OH^• species, that resulted in OH^• to be major reactive species (RS) in the solution. The density and lifetime of OH^• species acted inversely proportional to each other with increasing depth inside the solution. The cause of increased lifetime of OH^• inside the solution is predicted using theoretical and semiempirical calculations. Further, to predict the mechanism of conversion of hydroxide ion (OH⁻) to OH^• or H₂O₂ (hydrogen peroxide) and electron, we determined the current inside the solution of different pH. Additionally, we have investigated the critical criterion for OH^• interaction on cancer cell inducing apoptosis under effective OH^• exposure time. These studies are innovative in the field of plasma chemistry and medicine.