水溶性和碱溶性蔗渣木质素的分离与表征

doi:10.3969/j.issn.1673-5854.2017.04.001

Abstract

Abstract: The lignin fractions(water-soluble lignin L1 and alkali-soluble lignin L2, L3)were extracted by H₂O, 1% NaOH and 3% NaOH aqueous solution from the dewaxed bagasse. The components of three lignin fractions were analyzed by nitrobenzene oxidation and high performance liquid chromatography, the molecular weights were detected by gel permeation chromatography, and the structure units and linkages were studied by UV and 2D HSQC NMR. The results reflected that the yields of L1, L2 and L3 were 0.4%, 5.7% and 3.7%, and they occupied 54.1% of the original lignin.And the molecular weight of water-soluble lignin was higher than that of alkali-soluble lignin. Furthermore, the L2 and L3 were from the secondary wall of bagasse and the dominating constituents of them were syringyl units and large amounts of noncondensed ether structures. The lignin structural units were linked to each other mainly by β-O-4' ether bonds, β-β', β-5', β-1'. And the lignin was GSH lignin composed by syringyl, guaiacyl and little p-hydroxylphenyl units. The linkage between p-coumaric and lignin was ester bond, whereas the linkages between ferulic acid and lignin were both ether and ester bonds.

Key words: water-soluble bagasse lignin, alkali-soluble bagasse lignin, structural features, 2D-HSQC NMR

CLC Number:

TQ35
X793

PENG Feng, FU Genque, WANG Xiaojun, HU Yajie, YUE Panpan. Isolation and Characterization of Water-soluble and Alkali-soluble Lignin from Bagasse[J]. bce, 2017, 51(4): 1-7.

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Isolation and Characterization of Water-soluble and Alkali-soluble Lignin from Bagasse

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