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Revealing the relationship between molecular weight of lignin and its color, UV-protecting property

Journal Article · · International Journal of Biological Macromolecules
 [1];  [2];  [1];  [3];  [2];  [1]
  1. Guangxi Univ., Nanning (China); Ministry of Education, Nanning (China)
  2. Guangxi Univ., Nanning (China); Guangxi 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)
Lignin has great potential as a natural, green, and sustainable broad-spectrum sunscreen active ingredient. However, the coexistence of dark color and sunscreen properties hinders its application in cosmetics. In this study, we focus on the effects of the molecular weight of lignin on tis UV-protecting property and color in order to prepare lignin-based sunscreen with high performance. We report a prepared sunscreen containing low molecular weight lignin (F5, <1000 g/mol) exhibits good UV-protecting property (sun protection factor (SPF) = 7.14) and light color advantages (ΔE = 46.2). Moreover, a strong synergistic effect on UV-protecting property exists between low molecular weight lignin and ethylhexyl methoxycinnamate (EHMC), resulting in high SPF of F5@EHMC-based sunscreen (55.56). Additionally, added TiO2 can efficiently mitigate the dark color of lignin-based sunscreens due to prominent covering power of TiO2. Moreover, lignin-based sunscreens have good biocompatibility with HaCaT cells. This work is useful for understanding the mechanism of the UV-protecting property and dark color of lignin, and for designing an efficient and safe lignin-based sunscreen.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1969806
Journal Information:
International Journal of Biological Macromolecules, Journal Name: International Journal of Biological Macromolecules Journal Issue: A Vol. 223; ISSN 0141-8130
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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