Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 91, Issue -, Pages 315-322Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.indcrop.2016.07.035
Keywords
Pycnoporus sanguineus; Candida tropicalis; Wheat straw; Lignin; Biodelignification chemistry; Chemical structure
Categories
Funding
- National Science Foundation of China [31070524]
- Major State Basic Research Development Program of China [2010CB732205]
- Doctorate Fellowship Foundation of Nanjing Forestry University
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Pycnoporus sanguineus (Ps) and Candida tropicalis (Ct) can selectively degrade the lignin and hemicellulose in lignocellulosic cells respectively; Ps-Ct mixed fermentation may improve the multiphase reaction performance of lignin in the cell walls. Alkaline nitrobenzene oxidation, ozonation and infrared spectroscopy, which are the in-situ analytical techniques of lignin in the cells, were used to characterize the delignification kinetics, the reactions of the non-condensed, beta-O-4 structures and their stereochemistry of lignin in wheat straw in Ps and Ps-Ct fermentations. Results indicated that the biodelignification processes in Ps and Ps-Ct fermentations of wheat straw, being divided into a fast phase and a following slow phase, had the characteristics of a pseudo-first-order reaction in both the phases. The lignin reaction pathways in Ps and Ps-Ct mainly included the cleavage of ring, C alpha-C beta, beta-O-4, and the cleavage and polymerization of 5-5'. Compared with Ps fermentation, Ps-Ct fermentation enhanced the biodegradation of condensed, beta-O-4 structures and threo beta-O-4 structures in the lignin in the fast phase. A proposal scheme of biodelignification by Ps and Ps-Ct is outlined for the first time. These results will be helpful for the understanding and application of lignocellulosic biomass by mixed fermentations. (C) 2016 Elsevier B.V. All rights reserved.
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