Charité – Universitätsmedizin Berlin

Tour 1 - Evaluation of the difference between positive and negative stress – EPR based UVA stress responsive method on skin and blood

Stress produces free radicals which can be counteracted by antioxidants. Depending on the antioxidant status of the skin and blood the radical formation as a response on a definite stress induced by UVA light differs in amount and typ. If reactive oxygen species predominate, the radical formation can be compensated by the antioxidant system. But when lipid oxygen species prevail, the point of positive stress is exceeded. The method can be applied on excised skin and blood samples.

Tour 2 - Physical method for the non-invasive determination of the sun protection factor of sunscreens by LED techniques

Measurement system for in vivo sun protection factor determination of sunscreens © Charité

An experimental method for the determination of the sun protection factor of sunscreen is developed at the Department of Skin Physiology at the Clinic of Dermatology and Allergology at Charité – Universitätsmedizin. The measurements are not based on the development of a sunburn as biological response of the skin to sun radiation. They will be carried out in vivo on volunteers by reflectance spectroscopy.


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Charité – Universitätsmedizin Berlin
Center of Experimental and Applied Cutaneous Physiology (CCP)
Luisenstraße 2
10117 Berlin, Germany

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