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Journal of Biomedical Optics

Ex-vivo spectroscopic quantification of sunscreen efficacy: proposal of a universal sun protection factor
Author(s): Hans-Jürgen Weigmann; Sabine Schanzer; Alexa Teichmann; F. Durat; Christina Antoniou; H. Schaefer; Wolfram Sterry; Jürgen Lademann
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Paper Abstract

The sun protection factor (SPF) describes the protective behavior of sunscreens insufficiently, because this factor takes into account only the UVB spectral range, and strains the volunteers during its determination by invasively invoking an erythema. A new noninvasive method is proposed that is based on the UV spectroscopic measurement of tape strips taken from a sunscreen-treated skin area. The resulting sum transmission spectra of the tape strips reflect the in-vivo distribution of the absorber on the skin and quantify the protective efficacy of the applied sunscreens over the complete UV spectral range. The spectroscopic data provide a basis for the calculation of a universal sun protection factor (USPF). The comparison of the concrete values of USPF and SPF results in the following statements. 1. An unique functional correlation is not to be expected because a different UVB / UVA dependence exists. 2. The size of the differences between both values is influenced clearly by the intensity relation of the average sum transmission in the UVB in comparison to the UVA range. 3. The USPF values objectively assess the efficacy of sunscreens considering a protection against all irradiation injuries.

Paper Details

Date Published: 1 July 2007
PDF: 8 pages
J. Biomed. Opt. 12(4) 044013 doi: 10.1117/1.2753365
Published in: Journal of Biomedical Optics Volume 12, Issue 4
Show Author Affiliations
Hans-Jürgen Weigmann
Sabine Schanzer, Charité Universitätsmedizin Berlin (Germany)
Alexa Teichmann, Charité Universitätsmedizin Berlin (Germany)
F. Durat, Charité Universitätsmedizin Berlin (Germany)
Christina Antoniou, Univ. of Athens (Greece)
H. Schaefer, Charité Universitätsmedizin Berlin (Germany)
Wolfram Sterry, Charité Universitätsmedizin Berlin (Germany)
Jürgen Lademann, Charité Universitätsmedizin Berlin (Germany)

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