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Role Evaluation of Active Groups in Lignin on UV-Shielding Performance

Journal Article · · ACS Sustainable Chemistry & Engineering
 [1];  [2];  [1];  [3];  [4];  [4];  [5];  [5];  [6];  [7];  [1]
  1. 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)
  2. Guangxi Univ., Nanning (China); Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning (China)
  3. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Guangxi Univ., Nanning (China)
  5. Tianjin Univ. of Technology, Tianjin (China)
  6. China Univ. of Mining and Technology, Xuzhou, Jiangsu (China)
  7. 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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