| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 30466 | Journal of Photochemistry and Photobiology B: Biology | 2013 | 8 Pages |
•Natural sunscreen emulsions are evaluated for their photoprotective activities.•Extracts of Helichrysum arenarium, Sambucus nigra and Crataegus monogyna are used as UV filters.•All studied emulsions show good UV protection and photostability in the in vitro experiments.
The aim of our study was to investigate the photoprotective activity and photostability efficacy of sunscreen formulations containing Helichrysum arenarium, Sambucus nigra, Crataegus monogyna extracts and their combination. UV transmission of the emulsion films was performed by using diffuse transmittance measurements coupling to an integrating sphere. In vitro photoprotection and photostability efficacy were evaluated according to the following parameters: sun protection factor (SPF), UVA protection factor (PF-UVA), UVA/UVB ratio and critical wavelength (λc) before and after UV irradiation. The results obtained show that the formulations containing polyphenols fulfill the official requirements for sunscreen products due to their broad spectrum of UV protection combined with their high photostability and remarkable antioxidant properties. Therefore H. arenarium, S. nigra, C. monogyna extracts represent useful additives for cosmetic formulation.
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