From Khoi-San indigenous knowledge to bioengineered CeO2 nanocrystals to exceptional UV-blocking green nanocosmetics

Sintwa, N.; Ditlopo, N.; Khamlich, S.; Manikandan, E.; Gnanasekaran, K.; Henini, M.; Gibaud, A.; Krief, A.; Maaza, M.

Abstract

Single phase CeO2 nanocrystals were bio-synthesized using Hoodia gordonii natural extract as an effective chelating agent. The nanocrystals with an average diameter of 〈Ø〉 ~ 5–26 nm with 4+ electronic valence of Ce displayed a remarkable UV selectivity and an exceptional photostability. The diffuse reflectivity profile of such CeO2 exhibited a unique UV selectivity, in a form of a Heaviside function-like type profile in the solar spectrum. While the UV reflectivity is significantly low; within the range of 0.7%, it reaches 63% in the VIS and NIR. Their relative Reactive Oxygen Species (ROS) production was found to be < 1 within a wide range of concentration (0.5–1000 μg/ml). This exceptional photostability conjugated to a sound UV selectivity opens a potential horizon to a novel family of green nano-cosmetics by green nano-processing.

Citation

Sintwa, N., Ditlopo, N., Khamlich, S., Manikandan, E., Gnanasekaran, K., Henini, M., …Maaza, M. (2022). From Khoi-San indigenous knowledge to bioengineered CeO2 nanocrystals to exceptional UV-blocking green nanocosmetics. Scientific Reports, 12(1), Article 3468. https://doi.org/10.1038/s41598-022-06828-x

• Journal Article Type: Article
• Acceptance Date: Feb 1, 2022
• Online Publication Date: Mar 2, 2022
• Publication Date: 2022
• Deposit Date: Mar 16, 2022
• Publicly Available Date: Mar 17, 2022
• Journal: Scientific Reports
• Electronic ISSN: 2045-2322
• Peer Reviewed: Peer Reviewed
• Volume: 12
• Issue: 1
• Article Number: 3468
• DOI: https://doi.org/10.1038/s41598-022-06828-x
• Keywords: Multidisciplinary
• Public URL: https://nottingham-repository.worktribe.com/output/7608167
• Publisher URL: https://www.nature.com/articles/s41598-022-06828-x