UV protection afforded by gel-trapped TiO2 particles

Milan F. Sojka; Phillip G. Cummins; Lieve A. G. Declercq; Christina G. Fthenakis; Mirela C. Ionita-Manzatu; Wilson A. Lee; Daniel H. Maes; Mary Ann McKeever-Alfieri; Linda J. Najdek; Nadine Pernodet; Ilse M. E. Sente; Lawrence P. Teta; Katrin Van Rillaer; Daniel B. Yarosh; Paolo U. Giacomoni

doi:10.1039/C0PP00327A

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Photochemical & Photobiological Sciences

Issue 7, 2011

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UV protection afforded by gel-trapped TiO₂ particles

Milan F. Sojka , Phillip G. Cummins , Lieve A. G. Declercq , Christina G. Fthenakis , Mirela C. Ionita-Manzatu , Wilson A. Lee , Daniel H. Maes , Mary Ann McKeever-Alfieri , Linda J. Najdek , Nadine Pernodet , Ilse M. E. Sente , Lawrence P. Teta , Katrin Van Rillaer , Daniel B. Yarosh and Paolo U. Giacomoni

Photochem. Photobiol. Sci., 2011,10, 1146-1151

DOI: 10.1039/C0PP00327A
Received 05 Nov 2010, Accepted 11 Mar 2011
First published on the web 30 Mar 2011

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We have developed a technology to incorporate micronized titanium dioxide (TiO₂), together with antioxidants, in particles of a UV-visible transparent polymer gel. These particles are coated with silica to avoid clustering and the size of the micronized TiO₂ reduces the back scattering of white light. gel-trapped TiO₂ minimizes the oxidative stress exerted by UV radiation, increases the photo-stability of some accompanying ingredients, such as avobenzone. The size of the particles is in the micrometre range. This favors their permanence on the top of the stratum corneum. Gel-trapped TiO₂-based sunscreens provide a larger SPF and two-fold larger UVA protection than equal-composition sunscreens that contain larger amounts of untrapped TiO₂.

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UV protection afforded by gel-trapped TiO₂ particles