Fig. 6: Lignin depolymerization by Pep/hemin nanomaterial catalysts.
From: Highly stable and tunable peptoid/hemin enzymatic mimetics with natural peroxidase-like activities
a Schematic representation showing the multiple active sites on peptoid-hemin nanomaterial interacting with lignin (left) compared to a single-active site on lignin peroxidase (right). b Residual weight percent of EOL after treated with Pep-1/hemin, Pep-2/hemin, and Pep-3/hemin for 30 min, 1 h, and 2 h. The error bar represents the standard deviation of three measurements. c GPC profile of EOL samples before treatment, after treatment with Pep-1/hemin, Pep-2/hemin, or Pep-3/hemin in the presence of H2O2, after treatment only with H2O2. d GC-MS results of ethyl acetate extractable products, including five phenolic compounds a–e, from lodgepole pine lignin treated with or without peptoid/hemin catalysts at 60 °C under acidic solution (pH~4) in the presence of H2O2. e Proposed reaction mechanism of oxidative depolymerization of lignin with the heme center in peptoid/hemin nanomaterial catalyst.
