Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 108, Issue -, Pages 864-871Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.indcrop.2017.08.065
Keywords
Bamboo; Formic acid; High-pressure fractionation; Lignin; Structural analysis
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Funding
- China Scholarship Council
- Graduate School of Chemical Engineering
- National Natural Science Foundation of China [31370581, 31540009]
- Independent Innovation and Achievements Transformation Project of Shandong Province [2014CGZH0302]
- Yellow River Mouth Scholar Program [DYRC20120105]
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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.
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