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

被引：49

作者：

Havenga, D. ^{[1
,2
,3
]}

Akoba, R. ^{[1
,2
]}

Menzi, L. ^{[1
,2
]}

Azizi, S. ^{[1
,2
]}

Sackey, J. ^{[1
,2
]}

Swanepoel, N. ^{[3
]}

Gibaud, A. ^{[1
,2
,4
]}

Maaza, M. ^{[1
,2
]}

机构：

[1] UNESCO UNISA Africa Chair Nanosci Nanotechnol, Coll Grad Studies, POB 392, Pretoria, South Africa

[2] iThemba LABS Natl Res Fdn, Nanosci African Network NANOAFNET, 1 Old Faure Rd,POB 722, ZA-7129 Johannesburg, South Africa

[3] Univ South Africa, Dept Anthropol & Archaeol, Coll Human Sci, POB 392, Pretoria, South Africa

[4] Univ Le Maine, Phys Dept, Le Maine, France

来源：

SCIENTIFIC REPORTS | 2022年 / 12卷 / 01期

基金：

新加坡国家研究基金会;

关键词：

ANTIBACTERIAL ACTIVITY; HYDROTHERMAL SYNTHESIS; ALPHA-FE2O3; HEMATITE; IRON; OCHRE; DECOMPOSITION; SUSPENSIONS; SPECTRUM; DIOXIDE;

D O I：

10.1038/s41598-021-04663-0

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 alpha-Fe2O3 nanocrystals with an additional hydrolized oxide component in a form of gamma-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.

引用

页数：10

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