Liu Xiaoling1, Cheng Xiansu﹡1, 2
(1.College of Material Science and Engineering, Fuzhou University, Fuzhou 350002;
2.Department of Chemistry and Chemical Engineering, Minjiang University, Fuzhou 350011)
Abstract: EH lignin from the cornstalks residue was separated by two methods. The EH lignin was analyzed with respect to molecular weights, IR, UV spectra and 13C-NMR spectroscopy. The results indicated that EH lignin had lower molecular weight than the milled wood lignin and contained many active chemical groups. There were different absorbance peaks at 1700cm-1 and 1328cm-1 on the IR spectra of EH lignin. It is showed that the non-conjugated carbonyls were existed in the EH lignin. The absorbance appeared in 210 nm, 280 nm and 310 nm in UV spectra of the EH lignin, the fact indicate the EH lignin is an unsaturated polymer. According to the 13C-NMR, the separated EH lignin belongs to “GSH”-lignin, and it is composed mainly of β-O-4 ether bonds together withβ-5 andβ-1 carbon-carbon linkages between the lignin structural units. The yield of EH lignin, extracted with NaOH was higher with organic solvents. The effective application of EH lignin will rise the beneficial result of enzymatic hydrolysis.
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