Tannin–Titanium Oxide Multilayer as a Photochemically Suppressed Ultraviolet Filter
| Autor: | Kyeong Rak Kim, Woo Jin Kim, Jun Bae Lee, Ho Yeon Son, Jihui Jang, Moung Seok Yoon, Jae-Woo Cho, Bon Il Koo, Yoon Sung Nam |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Ultraviolet Rays Metal Nanoparticles chemistry.chemical_element 02 engineering and technology 010402 general chemistry Photochemistry medicine.disease_cause 01 natural sciences Redox Oxygen chemistry.chemical_compound Tannic acid medicine Molecule General Materials Science Titanium chemistry.chemical_classification Reactive oxygen species 021001 nanoscience & nanotechnology 0104 chemical sciences Titanium oxide chemistry Titanium dioxide Reactive Oxygen Species 0210 nano-technology Sunscreening Agents Tannins Ultraviolet |
| Zdroj: | ACS Applied Materials & Interfaces. 10:27344-27354 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.8b09200 |
| Popis: | UV filters can initiate redox reactions of oxygen and water when exposed to sunlight, generating reactive oxygen species (ROS) that deteriorate the products containing them and cause biological damages. This photochemical reactivity originates from the high chemical potential of UV filters, which also determines the optical properties desirable for sunscreen applications. We hypothesize that this dilemma can be alleviated if the photochemical pathway of UV filters is altered to coupling with redox active molecules. Here, we employ tannic acid (TA) as a key molecule for controlling the photochemical properties of titanium dioxide nanoparticles (TiO2 NPs). TA provides an unusual way for layer-by-layer assembly of TiO2 NPs by the formation of a ligand-to-metal charge transfer complex that alters the nature of UV absorption of TiO2 NPs. The galloyl moieties of TA efficiently scavenge ROS due to the stabilization of ROS by intramolecular hydrogen bonding while facilitating UV screening through direct charge injection from TA to the conduction band of TiO2. The TiO2-TA multilayers assembled in open porous polymer microspheres substantially increased sun protection while dramatically reducing ROS under UV exposure. The assembled structure exhibits excellent in vivo anti-UV skin protection against epidermal hyperplasia, inflammation, and keratinocyte apoptosis without long-term toxicity. |
| Databáze: | OpenAIRE |
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