Harnessing nature's shield: enhancing sun protection with lignin nanoparticles in cosmetics
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THE MAJOR MECHANISMS INFLUENCING THE UV SHIELDING PERFORMANCE OF LNPS
view moreCREDIT: ZHICHENG JIANG, ET AL.,
Lignin nanoparticles (LNPs) have emerged as promising candidates for enhancing sun protection in cosmetics, offering superior UV-blocking capabilities compared to soluble lignin oligomers. However, the effects of the chemical structures of constituting lignin oligomers in LNPs and the particle size distribution of LNPs were rarely investigated. Besides, the raw materials used in these works were mainly technical lignin, whose structures significantly changed during the extraction process, making them unsuitable for studying the structural effect of UV-blocking.
In a study published in the KeAi journal Carbon Resources Conversion, a group of researchers from China investigated the interactions between LNPs' chemical structures and particle size distributions, shedding light on key factors influencing their effectiveness in boosting Sun Protection Factors (SPF) in sunscreens.
"Upon preparation into nanoparticles, lignin can synergistically enhance the UV shielding effect of composite materials when combined with other anti-UV agents, such as commercial sunscreens,” explains co-corresponding author Zhicheng Jiang from the College of Biomass Science and Engineering at Sichuan University. “When incorporated LNPs into sunscreens, they exhibit varied morphologies and exert distinct UV-blocking capabilities; however, modulating this UV shielding capacity is not straightforward, as it involves various factors including structure, particle size, and concentration, among others, affecting the shielding performance of the mixed sunscreen formulations post-LNPs incorporation.”
The researchers found that compact LNPs with conjugating C=O and β-O-4 linkages, as well as the presence of the syringyl unit rich in the methoxyl group in the structures, were beneficial in boosting the UV resistance of the sunscreens.
“In sunscreen formulations, the simultaneous inclusion of large and small LNPs results in a state of disorder, which allows some particles to fill the gaps between them and adjacent particles, leading to a more compact LNP shield,” says Jiang. “Consequently, this enhances the UV-blocking capability of the mixture, rendering it significantly higher than sunscreen formulations containing LNPs with a uniform size distribution at the same concentration.”
Tianyu Liang, lead author of the study, adds, "In the past, exploring the UV shielding mechanism of LNPs and consciously regulating them was a daunting task. This suggests that we can now identify effective approaches to intentionally modify their UV-blocking capacity, whether by altering the chemical structure of LNPs or regulating the distribution of LNP particle sizes. Furthermore, the study suggests that LNPs hold promise as natural-based materials for UV protection in sunscreen formulations and other cosmetic applications.”
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Contact the author: Zhicheng Jiang, College of Biomass Science and Engineering, National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu, China, zhichengjiang@scu.edu.cn
The publisher KeAi was established by Elsevier and China Science Publishing & Media Ltd to unfold quality research globally. In 2013, our focus shifted to open access publishing. We now proudly publish more than 100 world-class, open access, English language journals, spanning all scientific disciplines. Many of these are titles we publish in partnership with prestigious societies and academic institutions, such as the National Natural Science Foundation of China (NSFC).
JOURNAL
Carbon Resources Conversion
METHOD OF RESEARCH
Experimental study
SUBJECT OF RESEARCH
Not applicable
ARTICLE TITLE
New Insights into Greener Skin Healthcare Protection: Lignin nanoparticles as additives to develop natural-based sunscreens with high UV
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