Structural and Photoprotective Characteristics of Zn-Ti, Zn-Al, and Mg-Al Layered Double Hydroxides—A Comparative Study

IF 3.4 Q2 BIOCHEMISTRY & MOLECULAR BIOLOGY Cosmetics Pub Date : 2023-07-07 DOI:10.3390/cosmetics10040100

O. Egambaram, S. Kesavan Pillai, S. Ray, Marlize Goosen

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Abstract

Organic UV filters have been known to generate harmful by-products and undergo photoreactive degradation, which ultimately poses a great threat to consumers using sunscreen products. Inorganic UV filters such as TiO2 and ZnO, although considered safer options, are not without threat considering their photocatalytic nature and ability to generate reactive oxygen species. A study was conducted to identify the influence of different metal ions on the photochemical properties of layered double hydroxides (LDH), Zinc-Titanium LDH (Zn-Ti LDH), Zinc-Aluminium LDH (Zn-Al LDH), and Magnesium- Aluminium LDH (Mg-Al LDH) and their prospects in photoprotection. The photocatalytic properties of the LDH were analyzed and compared to TiO2 and ZnO. The intermediate band gaps of Zn-Ti (3.72 eV) and Zn-Al LDH (3.3 eV) proved favorable and safer for the use of these LDH in cosmetic formulations as they offer lower photo-reactivity when compared to cosmetic grade ZnO and TiO2. The in vitro SPF values obtained for formulations containing 2 wt% Zn-Ti and 2 wt% Zn-Al LDH showed promise, with both samples claiming “broad spectrum” protection and valid claims of UVA protection.

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Zn-Ti、Zn-Al和Mg-Al层状双氢氧化物的结构和光防护特性比较研究

众所周知，有机紫外线过滤器会产生有害的副产物，并进行光反应降解，最终对使用防晒产品的消费者构成巨大威胁。无机紫外线过滤器，如TiO2和ZnO，虽然被认为是更安全的选择，但考虑到它们的光催化性质和产生活性氧的能力，并非没有威胁。研究了不同金属离子对层状双氢氧化物(LDH)、锌钛LDH (Zn-Ti LDH)、锌铝LDH (Zn-Al LDH)和镁铝LDH (Mg-Al LDH)光化学性质的影响及其在光防护中的应用前景。分析了LDH的光催化性能，并与TiO2和ZnO进行了比较。与化妆品级ZnO和TiO2相比，Zn-Ti (3.72 eV)和Zn-Al LDH (3.3 eV)的中间带隙具有较低的光反应性，因此在化妆品配方中使用这些LDH有利且更安全。含有2 wt% Zn-Ti和2 wt% Zn-Al LDH的配方获得的体外SPF值显示出希望，两种样品都声称具有“广谱”保护和有效的UVA保护。

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