Natural Sunscreens Based on Nanoparticles of Modified Kraft Lignin (CatLignin) | Zendy

Petri Widsten | Zendy; Tarja Tamminen | Zendy; Tiina Liitiä | Zendy

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Natural Sunscreens Based on Nanoparticles of Modified Kraft Lignin (CatLignin)

Author(s) -

Petri Widsten,

Tarja Tamminen,

Tiina Liitiä

Publication year - 2020

Publication title -

acs omega

Language(s) - English

Resource type - Journals

ISSN - 2470-1343

DOI - 10.1021/acsomega.0c01742

Subject(s) - lignin , sun protection factor , cosmetics , kraft paper , chemistry , ultraviolet , materials science , organic chemistry , dermatology , composite material , medicine , optoelectronics

Commercial chemical sunscreens have a high content of synthetic ultraviolet (UV) actives that have caused widespread damage to marine ecosystems and may have adverse health effects in humans. In the present work, safer bio-based sunscreens with lignin UV absorbers were developed to address this issue. Partly demethylated and otherwise altered kraft lignins, the so-called CatLignins with abundant phenolic hydroxyl auxochromes and catechol units, outperformed regular kraft lignins as sunscreen UV absorbers in terms of sun protection factor (UVB-SPF) and UVA-UVB transmittance. Converting lignins to nanoparticles significantly enhanced sunscreen performance. The best lignin sunscreen, containing nanoparticles of hardwood CatLignin, had a UV transmittance of only 0.5-3.8% over the entire UVA-UVB region compared to 2.7-51.1% of a commercial SPF 15 sunscreen. Lignin-based sunscreens are particularly suitable for dark-tinted SPF cosmetics.

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