Toxicity of CeO2 nanoparticles - the effect of nanoparticle properties

Journal of Photochemistry and Photobiology. B, Biology
Yu Hang LeungHung Kay Lee

Abstract

Conflicting reports on the toxicity of CeO2 nanomaterials have been published in recent years, with some studies finding CeO2 nanoparticles to be toxic, while others found it to have protective effects against oxidative stress. To investigate the possible reasons for this, we have performed a comprehensive study on the physical and chemical properties of nanosized CeO2 from three different suppliers as well as CeO2 synthesized by us, and tested their toxicity. For toxicity tests, we have studied the effects of CeO2 nanoparticles on a Gram-negative bacterium Escherichia coli in the dark, under ambient and UV illuminations. We have also performed toxicity tests on the marine diatom Skeletonema costatum under ambient and UV illuminations. We found that the CeO2 nanoparticle samples exhibited significantly different toxicity, which could likely be attributed to the differences in interactions with cells, and possibly to differences in nanoparticle compositions. Our results also suggest that toxicity tests on bacteria may not be suitable for predicting the ecotoxicity of nanomaterials. The relationship between the toxicity and physicochemical properties of the nanoparticles is explicitly discussed in the light of the current results.

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Citations

Nov 20, 2015·The Science of the Total Environment·Jing FangBing Shen
Jul 6, 2015·Journal of Photochemistry and Photobiology. B, Biology·Alan Man Ching NgHung Kay Lee
Sep 10, 2017·Environmental Science and Pollution Research International·Einstein Mariya David Sugantharaj DavidChandrasekaran Natarajan
Oct 16, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Yangang WangLifeng Cui
Feb 14, 2020·Journal of Biochemical and Molecular Toxicology·Abdolhossein MiriMina Sarani
Jun 24, 2017·Environmental Science and Pollution Research International·Racliffe W S LaiKenneth M Y Leung
Apr 20, 2020·Bulletin of Environmental Contamination and Toxicology·Guiqi ZhaoHongyan Guo
Aug 11, 2020·Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP·Alberto Teodorico CorreiaSara C Antunes
Aug 28, 2021·Nanomaterials·Vanessa ValdiglesiasBlanca Laffon

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