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Photoactivity tests of TiO2 and ZnO sunscreen ingredients

Published online by Cambridge University Press:  20 January 2012

Zuzanna. A. Lewicka  and
Vicki. L. Colvin
Zuzanna. A. Lewicka
Affiliation:
Applied Physics Program, Department of Electrical and Computer Engineering, 6100 Main Street MS-60, Rice University, Houston TX 77005, USA
Vicki. L. Colvin*
Affiliation:
Department of Chemistry, Rice University, Rice University, Houston TX 77005, USA
*
*Corresponding author: Phone: 713-348-5741, Fax: 713-348-2578, E-mail: colvin@rice.edu
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Abstract

Nanosized titanium dioxide (TiO2) and zinc oxide (ZnO) are widely used as inorganic sunscreen pigments. However, these metal oxide particles may also be photocatalytic and generate DNA-damaging reactive oxygen species. Therefore, we evaluated the photochemical properties of the whole sunscreen emulsions that contained nanoscale components and the inorganic particles derived from these sunscreens using several assays such as dichlorofluorescein fluorescence, the decolorization of Congo red dye and DMPO spin trap electron paramagnetic resonant spectroscopy. The results of these three tests showed that samples with ZnO nanoscale materials were more photoactive than the samples that contained TiO2 nanoparticles.

Keywords

photochemicalnanostructurenanoscale
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1413: Symposium GG – Safety and Toxicity Control of Nanomaterials , 2012 , mrsf11-1413-gg03-03
Copyright
Copyright © Materials Research Society 2012

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References

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