Coty B.v.

Privatinstitut Fuer Dermatologische Produktforschung Galenus Gmbh

Privatinstitut Für Dermatologische Produktforschung Galenus Gmbh

Thomas Herrling

Leonhard Zastrow

Karin Golz-Berner

Louis Ferrero

Norbert Groth

The invention relates to a method for determining an integral sun protection factor (&#x222b; SPF or iSPF) which encompasses both UVA and UVB radiation and can be used for classifying cosmetic and dermatological sunscreens. The method comprises the steps of applying a defined amount of the sunscreen onto a defined area of a skin substrate impregnated with a spin trap, exposing the skin substrate to a defined amount of UVA- and UVB rays by a sun simulator, subjecting the skin substrate exposed to radiation to an electron spin resonance (ESR) measurement, recording the number of free radicals trapped as a real number&#xd7;10free radicals/mg of skin sample, and determining the integral sun protection factor &#x222b; SPF according to the equations (1) and (2) and (8) 

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Berlin, Germany

Thomas Herrling