Abstract
A novel microcapsule with a reverse bumpy ball structure was formed to scavenge the reactive oxygen species (ROS) derived from an inorganic particulate ultraviolet (UV) filter. The microcapsule was composed of zinc oxide nanoparticles (ZnO NPs) and cerium dioxide (CeO2) shell, with a number of ZnO NPs encapsulated within the CeO2 hollow microsphere. The UV shield performance, the ability to remove the generated ROS, and the cytotoxicity of microcapsule under various conditions were evaluated through a series of in vitro experiments. The results show that the design not only improves the UV shielding performance of the ZnO NPs, but also significantly reduces the self-generated ROS by being confined in the hollow structure and the antioxidative action of the CeO2 shell. In general, a simple and effective strategy for removing the produced ROS from inorganic UV filters without compromising their shielding capacity was presented. This new microcapsule opens up a new avenue for the rational design of next-generation UV filters with minimal side effects.
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