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From Himba indigenous knowledge to engineered Fe2O3 UV-blocking green nanocosmetics

Article scientifique 2022 Anglais

Résumé

Abstract This contribution reports on the physical properties of the natural Namibian red Ochre used by the Himba Community in a form of a formulation, so called Otjize as a skin protective and beauty cream. The morphological and crystallographic studies of this red ochre validated its nano-scaled dominating phase of rhombohedral α-Fe2O3 nanocrystals with an additional hydrolized oxide component in a form of γ-FeOOH. The optical investigations showed that such a red ochre exhibits an exceptional UV filtration and a significant IR reflectivity substantiating its effectiveness as an effective UV-blocking & solar heat IR reflector in support of the low skin cancer rate within the Namibian Himba community. In addition, such nanocrystals exhibited a non-negligible antibacterial response against E. Coli & S. Aurus. This study seems confirming the effectiveness of the indigenous Otjize as an effective skin UV protection cream with a sound antimicrobial efficacy against e-Coli & S-Aurus.

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Havenga, D., Akoba, R., Menzi, L., Azizi, S., Sackey, J., Swanepoel, N., Gibaud, A. (2022). From Himba indigenous knowledge to engineered Fe2O3 UV-blocking green nanocosmetics. https://doi.org/10.1038/s41598-021-04663-0

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Auteur(s)

D. Havenga R. Akoba L. Menzi Shohreh Azizi J. Sackey Natalie Swanepoel A. Gibaud

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