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

Petri Widsten (Corresponding Author), Tarja Tamminen, Tiina Liitiä

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

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.
Original languageEnglish
Pages (from-to)13438-13446
Number of pages9
JournalACS Omega
Volume5
Issue number22
Early online date20 May 2020
DOIs
Publication statusPublished - 9 Jun 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Hydroxyls
  • Hydrocarbons
  • Aromatic compounds
  • Biopolymers
  • Organic polymers

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