Revealing the structure of bamboo lignin obtained by formic acid delignification at different pressure levels

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Yongchao Zhang, Qingxi Hou, Wenyang Xu, Menghua Qin, Yingjuan Fu, Zhaojiang Wang, Stefan Willför, Chunlin Xu
Publisher: Elsevier
Publication year: 2017
Journal: Industrial Crops and Products
Journal acronym: Ind. Crops Prod.
Volume number: 108
Start page: 864
End page: 871
Number of pages: 8
ISSN: 0926-6690
eISSN: 1872-633X


Abstract

Bamboo was fractionated using formic acid based on a one-step organosolv process under high pressure (at 145 degrees C for 45 min, 0.3 MPa) and at atmospheric pressure (at 101 degrees C for 120 min), respectively. High-pressure formic acid lignin, atmospheric formic acid lignin and milled wood lignin of bamboo were subjected to comprehensive structural characterization using gel permeation chromatography (GPC), Fourier transform infrared (FTIR) and solution -state NMR techniques (H-1, C-13, 2D-HSQC, and P-31-NMR spectroscopies). The results indicated that the formic acid fractionation under high pressure presents a quick and efficient delignification method by enhancing the cleavage of interunitary bonds in lignin (beta-O-4 ', beta-beta and beta-5 '), and dissolved lignin also occurred condensation reaction. As compared to atmospheric formic acid lignin, high-pressure formic acid lignin obtained showed higher purity and yield, and had relatively higher contents of phenolic and carboxylic groups.


Keywords

Bamboo, High-pressure fractionation, Structural analysis

Last updated on 2019-23-09 at 05:58