Long-Acting Ultraviolet-Blocking Mechanism of Lignin: Generation and Transformation of Semiquinone Radicals

被引:36
作者
Fu, Yu [1 ]
Qian, Yong [1 ]
Zhang, Aicheng [1 ]
Lou, Hongming [1 ]
Ouyang, Xinping [1 ]
Yang, Dongjie [1 ]
Qiu, Xueqing [2 ]
机构
[1] South China Univ Technol, Sch Chem & Chem Engn, Guangzhou 510640, Peoples R China
[2] Guangdong Univ Technol, Sch Chem Engn & Light Ind, Guangzhou 510006, Peoples R China
来源
ACS SUSTAINABLE CHEMISTRY & ENGINEERING | 2022年 / 10卷 / 17期
基金
中国国家自然科学基金;
关键词
organosolv lignin; UV-blocking; semiquinone radicals; phototransformation; ELECTRON-PARAMAGNETIC-RESONANCE; STRUCTURAL-CHARACTERIZATION; ANTIOXIDANT ACTIVITIES; ALKALI LIGNIN; DEGRADATION; PERFORMANCE; SUNSCREENS; PRODUCTS;
D O I
10.1021/acssuschemeng.1c08051
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The natural inspired ultraviolet (UV)-absorbing function of lignin has been widely used in cosmetics and photothermal materials; however, its long-acting UV-blocking mechanism is still unclear. Herein, three organosolv lignins (OLs) were extracted from different botanical resources under mild conditions. These OLs preserved the native structure of lignin, and the best one was chosen to investigate the long-acting UV-blocking mechanism of lignin from the perspective of radicals. Results showed that 136% fresh semiquinone (SQ) radicals were formed when OL was irradiated under UV light for 4 h, and beyond half of these newly generated radicals were readily preserved after withdrawing UV irradiation. The generation and reduction of SQ in OL exhibited good photoresponsivity and cyclic stability, indicating that there was an SQ-based hydroquinone/quinone dynamic transformation. After 1 h of irradiation, the radical and phenolic hydroxyl contents in OL and the sun protection factor of an OL-based sunscreen increased by 110, 10, and 61%, respectively. After 12 h of irradiation, the antioxidant property of OL only weakened a little, while the sunscreen performance was still better than its initial state. The color of OL darkened at the initial time and then turned white gradually. This research paves the way to understanding the long-term UV-blocking mechanism and application of biomass lignin.
引用
收藏
页码:5421 / 5429
页数:9
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