Organosolv ethanol lignin from hybrid poplar as a radical scavenger: relationship between lignin structure, extraction conditions, and antioxidant activity.

By Xuejun Pan, J. Kadla, K. Ehara, N. Gilkes, J. Saddler. Journal of Agricultural and Food Chemistry, 2006

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Value-adding to cellulosic ethanol: lignin polymers. (2011, background): “, 2001) act as antioxidants, (Krizkova et al., 2000; Pan et al., 2006; Ugartondo et al., 2008) absorb UV radiation, (Toh et al.”
Preparation and characterisation of lignin nanoparticles: evaluation of their potential as antioxidants and UV protectants (2016, background): “Further, phenolic structures with ortho-substituents, such as methoxyl units, also stabilise these phenoxyl radicals by hindering them from propagation as well as by resonance.[36,37] The results from Figure 4 suggest that both DL and AL possessed antioxidant potential.”
Fabrication of uniform lignin colloidal spheres for developing natural broad-spectrum sunscreens with high sun protection factor (2017, background): “Due to its broad-spectrum UV-absorbing and excellent antioxidant properties (Pan et al., 2006; Ban et al., 2007; Sun et al., 2012), we developed lignin as natural macromolecular sun blocker in recent years (Qian et al., 2015).”