Enhancing the Broad-Spectrum Adsorption of Lignin through Methoxyl Activation, Grafting Modification, and Reverse Self-Assembly

Lignin nanospheres with broad-spectrum UV adsorption and excellent antioxidant properties were obtained by demethoxylation of alkali lignin (AL) and grafting the benzophenone moiety (UV-0) followed by a reverse self-assembly. The critical wavelength (λc) of the optimal AL-UV03 sample was ∼375 nm, while the UVA/UVB ratio reached 0.84. When it was applied as a unique active in sun cream, the sun protection factor value of the cream containing 10 wt % AL-UV03 was 22.81, which could further increase to 56.14 when it formed reverse colloidal spheres (LRCS) with a size of ∼130 nm. The self-assembly process and the UV-absorbing enhancement mechanism of LRCS were monitored and revealed by fluorescence, UV, and light scattering analysis. In addition, AL-UV03 exhibited superior photostability due to the three-dimensional network structure of lignin. The antioxidant activities of AL-UV03 and LRCS were better than that of AL and could increase continuously with the dosage. Both AL-UV03 and LRCS exhibited good biocomp...

• Publication year

  2019

• Venue

  ACS Sustainable Chemistry and Engineering

• Publication date

  2019-08-01

• Fields of study

  Materials Science, Chemistry, Environmental Science

• Identifiers
  DOI 10.1021/ACSSUSCHEMENG.9B02317
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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