Photostability of Sun Filters Complexed in Phospholipids or Beta-Cyclodextrin

May 6, 2003 | Contact Author | By: Ugo Citernesi, I.R.A Instituto Richerche Applicate Srl
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  • Keywords/Abstract

Keywords: sun filters | photostability | phospholipids | beta-cyclodextrin

Abstract: Laboratory tests of three commonly used sun filters show that the filters encapsulated in beta-cyclodextrin show a photostability significantly higher than that of the same filters uncomplexed or complexed with phospholipids.

The sun produces a great quantitiy of energy, which is transmitted by radiation of various types (see sidebar). When sun rays reach human skin, they interact with the epidermal cells. They are also able to interact with sun filters, which are substances applied on the skin to prevent sunburn and erythema. UV radiation, in particular, produces a high activation energy and induces a partial degradation or alteration process in a filter so that the filter reduces or loses its capacity for skin protection.1 This process is called photodegradation.