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

Article scientifique 2022 Anglais

Résumé

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.

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Ditlopo, N., Sintwa, N., Khamlich, S., Manikandan, E., Gnanasekaran, K., Henini, M., Gibaud, A., Krief, A. (2022). From Khoi-San indigenous knowledge to bioengineered CeO2 nanocrystals to exceptional UV-blocking green nanocosmetics. https://doi.org/10.1038/s41598-022-06828-x

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Auteur(s)

N. Ditlopo Nolufundo Sintwa S. Khamlich E. Manikandan Karthikeyan Gnanasekaran M. Henini A. Gibaud A. Krief

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