Abstract
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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Sojka, M.F., Cummins, P.G., Declercq, L.A.G. et al. UV protection afforded by gel-trapped TiO2 particles. Photochem Photobiol Sci 10, 1146–1151 (2011). https://doi.org/10.1039/c0pp00327a
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DOI: https://doi.org/10.1039/c0pp00327a