UV-shielding property, photocatalytic activity and photocytotoxicity of ceria colloid solutions

UV-shielding property, photocatalytic activity and cytotoxicity (including photocytotoxicity) of citrate-stabilized ceria colloid solutions were studied. It was established that UV-shielding property (namely, the sun protection factor, the critical absorption wavelength and the UVA/UVB- ratio) of ce...

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Bibliographic Details
Published in:Journal of photochemistry and photobiology. B, Biology Biology, 2011-01, Vol.102 (1), p.32-38
Main Authors: Zholobak, N.M., Ivanov, V.K., Shcherbakov, A.B., Shaporev, A.S., Polezhaeva, O.S., Baranchikov, A.Ye, Spivak, N.Ya, Tretyakov, Yu.D.
Format: Article
Language:English
Subjects:
Animals
Catalysis
Cercopithecus aethiops
Ceria
Cerium - chemistry
Cerium - toxicity
Colloids
Mice
Nanostructures - chemistry
Nanostructures - toxicity
Photocatalysis
Photochemical Processes
Photocytotoxicity
Size effect
Solutions
Sunscreen
Sunscreening Agents - chemistry
Sunscreening Agents - toxicity
Ultraviolet Rays
Vero Cells
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Summary:UV-shielding property, photocatalytic activity and cytotoxicity (including photocytotoxicity) of citrate-stabilized ceria colloid solutions were studied. It was established that UV-shielding property (namely, the sun protection factor, the critical absorption wavelength and the UVA/UVB- ratio) of ceria nanoparticles are as good as those of titanium dioxide and zinc oxide nanoparticles. It was further demonstrated that ceria nanoparticles possesses substantially lower photocatalytic activity, which additionally decreases upon decrease in ceria particle size. It was found that colloid ceria solutions are non-toxic to mouse fibroblasts (L929) and fibroblast-like cells of African Green monkey (VERO). Moreover, ceria nanoparticles are capable to protect these cells from UV-irradiation-induced damage. It was proposed that nanocrystalline ceria could be used not only as UV-blocking material, but also as prophylactic and even therapeutic compound for sunburns treatment.
ISSN:1011-1344
1873-2682
DOI:10.1016/j.jphotobiol.2010.09.002