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    Chelator-mediated biomimetic degradation of cellulose and chitin

    Year: 2020

    Journal: Int. J. Biol. Macromol., Volume 153, JUN 15, page 433–440

    Authors: Liu, Jianzhao; Zhu, Yuan; Wang, Chao; Goodell, Barry; Esker, Alan R.

    Keywords: Chelator-mediated Fenton (CMF) catalysis; Non-enzymatic degradation; Quartz crystal microbalance with dissipation monitoring (QCM-D); Atomic force microscopy (AFM); Cellulose filet; Chitin film; Brown rot fungal decay

    Non-enzymatic degradation of wood via a chelator-mediated Fenton (CMF) system is the primary method for initial attack in brown rot fungal decomposition of wood, the most common type of fungal degradation of terrestrial carbon biomass on the planet. In this study, the degradation of thin films of cellulose and chitin by a CMF system was investigated and compared to enzymatic hydrolysis. The kinetics of the rapid cellulose and chitin deconstruction and the morphologies of the degraded cellulose and chitin surfaces were studied by quartz aystal microbalance with dissipation monitoring (QCM-D) and atomic force microscopy (AFM), respectively. The QCMD results quantitatively indicated that similar to 90 wt% of the regenerated cellulose or chitin was capable of being deconstructed by CMF action alone. While enzymatic degradation was consistent with stripping of layers from the surface of the cellulose or chitin films, the CMF process exhibited a pronounced two stage process with a rapid initial depolymerization throughout the films. The initial degradation rates for both model surfaces by the CMF system were faster than enzyme action. This research suggests that the CMF process should be applicable for the deconstruction of a wide variety of polysaccharides over Fenton chemistry alone. (C) 2020 Published by Elsevier B.V.
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