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Durability of the sun protection factor provided by dihydroxyacetone
Author(s) -
Faurschou A.,
Wulf H.C.
Publication year - 2004
Publication title -
photodermatology, photoimmunology and photomedicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.736
H-Index - 60
eISSN - 1600-0781
pISSN - 0905-4383
DOI - 10.1111/j.1600-0781.2004.00118.x
Subject(s) - sun protection factor , dihydroxyacetone , sunlight , sun protection , medicine , chemistry , dermatology , biochemistry , physics , astronomy , glycerol
Background/Purpose: The sunless tanning agent dihydroxyacetone (DHA) is known to protect against longwave ultraviolet radiation (UVA) and visible light. Recently, our laboratory has shown that DHA in addition offers a modest sun protection factor (SPF) in humans. We conducted this study in order to investigate the durability of the SPF provided by DHA. Methods: Ten healthy volunteers were treated with 20% DHA cream twice in three areas on the volar forearm. One, 5 and 7 days after the second application the participants were phototested with simulated sunlight in each area. Blue reflectance was used to measure the skin coloration by DHA in the test sites. Results: DHA generated a significant SPF of 3.0 at day 1, 2.0 at day 5 and 1.7 at day 7 ( P <0.0001). The SPF was positively correlated to the change in blue reflectance ( r =0.39, P =0.034). The loss of SPF unit/day was not significantly different between the subjects ( P <0.122). However, the intercepts were significantly different ( P <0.0001) indicating differences in the initial SPF obtained among the subjects. Conclusions: The SPF of DHA decreases with the same loss of SPF unit/day between humans and the durability of the SPF thus depends on the initial SPF provided.