Sunscreens' photochemical behaviour : in vivo evaluation by the stripping method

• Published in: International journal of cosmetic science Vol. 19; no. 2; pp. 87 - 101
• Main Authors: MARGINEAN LAZAR, G, FRUCTUS, A. E, BAILLET, A, BOCQUET, J. L, THOMAS, P, MARTY, J. P
• Format: Conference Proceeding Journal Article
• Language: English
• Published: London Blackwell Science 01.04.1997
• Subjects: Applied sciences; Chemical industry and chemicals; Cosmetics, toiletries; Exact sciences and technology; Washing products. Cosmetics and toiletries. Perfumes; Cosmetic; Human; In vivo; Local administration; Water oil emulsion; Oil water emulsion; Surface phenomenon; Test method; Photochemical stability; Sunscreen product; Ultraviolet filter; Topical administration
• ISSN: 0142-5463; 1468-2494
• DOI: 10.1046/j.1467-2494.1997.171703.x

This study shows the influence of a water-in-oil emulsion and an oil-in-water emulsion on the photochemical behaviour of four sunscreen preparations containing various amounts of three UV filters: octyl methoxycinnamate, butyl methoxydibenzoylmethane, and 4-methylbenzylidene camphor. With the stripping method in vivo, skin-product interactions were evaluated after topical application and ultra-violet exposure. Evaluations were also made under the same operating conditions as in determining sun protection factor in vivo. Results showed that each sunscreen preparation has a particular photochemical behaviour related to filter mixture and emulsion type. When developing a sunscreen preparation the choice of the emulsion type and filters is relevant for achieving optimum efficacy and spectral stability.