Role Evaluation of Active Groups in Lignin on UV-Shielding Performance
Journal Article
·
· ACS Sustainable Chemistry & Engineering
- Guangxi Univ., Nanning (China); Provincial and Ministerial Collaborative Innovation Center for Sugar Industry, Nanning (China); Engineering Research Center for Sugar Industry and Comprehensive Utilization, Ministry of Education, Nanning (China)
- Guangxi Univ., Nanning (China); Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning (China)
- Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Guangxi Univ., Nanning (China)
- Tianjin Univ. of Technology, Tianjin (China)
- China Univ. of Mining and Technology, Xuzhou, Jiangsu (China)
- Guangxi Univ., Nanning (China); Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning (China)
The contribution of the active groups in lignin to ultraviolet (UV)-shielding performance still remains unclear. In this study, we employed 16 lignin model compounds and theoretical calculations to ascertain the contribution of different functional groups to UV-shielding performance. These results showed that the order of UV-shielding performance on functional groups was -C=C–CHO > -C=C–COOH > -C=C–CH2OH > --C=C > quinone > -COOH > -OCH3 ≈ -OH. Moreover, the synergism between the para-substituted electron-donating group -OH and the electron-withdrawing group allyl on the aromatic ring played a major role in UV-shielding performance of lignin models, whereas the additive effect of meta/ortho-substituted -OCH3 played a secondary role. Furthermore, we found that the hydrophile–lipophile balance (HLB) value of lignin models also greatly affected the sunscreen protection factor (SPF) of lignin model-based sunscreens. A closer HLB value of lignin to 8.89 corresponded with a higher SPF of the lignin model-based sunscreen. The commercial photoprotective ingredient ethylhexyl methoxycinnamate (EHMC) and lignin models had a synergistic effect on UV-shielding performance caused by the π–π stacking interaction between the parallel-displaced stacked aromatic rings of lignin models and EHMC. Additionally, the UV irradiation test showed that these sunscreens prepared using lignin models and EHMC exhibited good photostability.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- Foundation of Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control; Guangxi Innovation Driven Development Special Fund Project, China; National Key Research and Development Program of China; National Natural Science Foundation of China; Natural Science Foundation of Guangxi Province, China; USDOE
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1885231
- Journal Information:
- ACS Sustainable Chemistry & Engineering, Journal Name: ACS Sustainable Chemistry & Engineering Journal Issue: 36 Vol. 10; ISSN 2168-0485
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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