title: Photostability study of commercial sunscreens submitted to artificial UV irradiation and/or fluorescent radiation.
abstract: Sunscreens contain molecules with the ability to absorb and/or reflect UVA (ultraviolet A) and UVB (ultraviolet B) radiation, thereby preventing this radiation from reaching the epidermis or dermis. Their photo stabilities after exposure to UV radiation are well known and described, but there is little data on the stability of these filters after fluorescent indoors light radiation, such as from light emitted by commercial lamps present in homes and offices. Those lamps can expose people to varying levels of UVB, UVA, visible light, and IR (infrared). This study assesses the photostability of four different commercial products containing chemical sun filters after artificial UV and fluorescent irradiation, correlating the UVB and UVA absorption efficiencies of each product against the different types of radiation. The tested products were applied on a plate of polymethylmethacrylate (PMMA) and irradiated by a solar simulator with specific filters for UVA and UVB and a commercial fluorescent light source. According to the results, three formulations did not show photostability, suffering significant changes in their UV absorption spectra, and one of the selected formulations can be considered photostable. This reinforces the importance of conducting stability studies for sunscreen formulations in different conditions, including under artificial (indoor) light exposure.
authors.affiliation: Postgraduate Program in Medical Sciences, Faculty of Medical Sciences, State University of Campinas (UNICAMP).
authors.forename: Rodrigo Colina
authors.initials: RC
authors.lastname: Romanhole
authors.affiliation: Postgraduate Program in Biosciences and Technology of Bioactive Products, Institute of Biology, University of Campinas (UNICAMP).
authors.forename: Janaina Artem
authors.initials: JA
authors.lastname: Ataide
authors.affiliation: Faculty of Pharmaceutical Sciences, State University of Campinas (UNICAMP).
authors.forename: Leticia Caramori
authors.initials: LC
authors.lastname: Cefali
authors.affiliation: Postgraduate Program in Biosciences and Technology of Bioactive Products, Institute of Biology, University of Campinas (UNICAMP).
authors.forename: Patricia
authors.initials: P
authors.lastname: Moriel
authors.affiliation: Postgraduate Program in Biosciences and Technology of Bioactive Products, Institute of Biology, University of Campinas (UNICAMP). Electronic address: pmazzola@fcf.unicamp.br.
authors.forename: Priscila Gava
authors.initials: PG
authors.lastname: Mazzola
mesh_terms: D005453:Fluorescence; D013472:Sunlight; D013473:Sunscreening Agents
chemical_list: D013473:Sunscreening Agents
keywords: Artificial light; Fluorescent light; Photostability; Sunscreens; UV radiation