Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 126, Issue -, Pages 376-384Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2018.12.234
Keywords
Organosolv lignin; Lignin-carbohydrate complex; Isolation; Structural characterization
Funding
- National Natural Science Foundation of China [31560195, 31760195, 51508484]
- Fundamental Research Funds of Yunnan Province, China [2018FB066]
- Yunling Industrial Technology Leading Talent of Yunnan Province, China [2018-212, 2016HB005]
- Guanxi Key Laboratory of Chemistry and Engineering of Forest Products, China [2017AD19029]
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Isolation of earth abundant biopolymer, Lignin, from Dendrocalamus sinicus and their structural properties were investigated to achieve its large-scale practical applications in value-added products. Two lignin fractions (MWL DSL) were isolated with successive treatments of dioxane and dimethylsulfoxide (DMSO) from dewaxed and ball milled bamboo (D. sinicus) sample. The two-step treatments yielded 52.1% lignin based on the total lignin content in the dewaxed bamboo sample. Spectroscopy analyses indicated that the isolated bamboo lignin was a typical grass lignin, consisting of p-hydroxyphenyl, guaiacyl, and syringyl units. The major interunit linkages presented in the obtained bamboo lignin were beta-O-4' aryl ether linkages, together with lower amounts of beta-beta', beta-5' and beta-1' linkages. The tricin was detected to be linked to lignin polymer through the beta-O-4' linkage in the bamboo. In addition, phenyl glycoside and benzyl ether lignin-carbohydrate complexes (LCC) linkages were clearly detected in bamboo (D. sinicus), whereas the gamma-ester LCC linkages were ambiguous due to the overlapping NMR signals with other substructures. The detailed structural properties of the obtained lignin fraction together with the light-weight will benefit efficient utilization of natural polymers as a possibly large-scale bio-based precursor for making polymeric materials, biochemicals, functional carbon and biofuels, and multifunctional polymer nanocomposites. (C) 2018 Published by Elsevier B.V.
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