STABILITY OF UV FILTERS IN DIFFERENT VEHICLES - SOLVENTS AND EMULSIONS

In this paper, we analyzed the stability of several ultraviolet (UV) f ilters exposed to simulated solar light. Evaluation of the photostabil ity of UV-A/UV-B filters has an important impact on the efficiency of sunscreen preparations. The purpose of this study is first to relate s ome of the solvent shifts that can interact with UV filters; secondly, it is to formulate sunscreen emulsions (oil in water and water in oil ) in order to evaluate the photostability of sunscreens in the mixture , and there-fore their efficiency in solar protection, because photost ability and protection are closely linked together.