期刊
SEPARATION SCIENCE AND TECHNOLOGY
卷 45, 期 16, 页码 2497-2506出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/01496391003793892
关键词
DMSO; LiCL; lignin separation; poplar; wood dissolution
资金
- Beijing Forestry University [BLX2008008, YX2010-10]
- China Postdoctoral Science Foundation [20090450303]
- Natural Science Foundation of China [30930073]
- Ministry of Science and Technology [973-2010CB732204]
- China Ministry of Education [111]
- State Forestry Administration [200804015]
In this paper, the physicochemical properties and structural features of six lignin preparations separated with a total dissolution of ball-milled wood in dimethyl sulfoxide and lithium chloride (DMSO/LiCl) followed by extraction with ethanol/water were investigated. These isolated lignin fractions were characterized using wet chemical analysis, FT-IR, and 1H and13C-NMR techniques. Experimental results showed that separated lignin preparations were relatively free of associated polysaccharides. These lignin fractions were classified as guaiacyl-syringyl lignin type: mainly composed of guaiacyl units with noticeable amounts of syringyl units and fewer p-hydroxyphenyl units. The molar ratio of non-condensed guaiacyl units to syringyl units (G/S) decreased as the ratio of LiCl to poplar weight increased. The results also showed that these lignin preparations consisted mainly of -O-4 ether bonds combined with small quantities of -' and -5 carbon-carbon linkages. Furthermore, considerable amounts of esterified p-hydroxybenzoic acids and minor amounts of esterified p-coumaric acid were also detected in these lignin fractions.
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