Hemicellulose Composition in Different Cell Wall Fractions Obtained using a DMSO/LiCl Wood Solvent System and Enzyme Hydrolysis |
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| Authors: | Yu Huang Zhiguo Wang Linshan Wang Yuesheng Chao Takuya Akiyama Tomoya Yokoyama |
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| Affiliation: | 1. Laboratory of Wood Chemistry, The University of Tokyo, Tokyo, Japan;2. Nanjing Forestry University, Nanjing, China;3. School of Sciences, Northeastern University, Shenyang, China |
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| Abstract: | In our previous studies on the relationships between lignin structure and hemicellulose composition in a wide range of hardwood species, we showed that the higher the syringyl ratio, the higher the xylan/mannan ratio. In this study, the relationship of the syringyl ratio and xylan/mannan ratio was further studied using fractions obtained by stepwise extraction of finely milled beech wood by use of aqueous dioxane and subsequent dimethyl sulfoxide (DMSO)/LiCl solvents with increasing LiCl concentration. Each soluble fraction obtained with a different LiCl concentration was compared with the corresponding insoluble residue, and it was shown that both the syringyl ratio and xylan/mannan ratio were always higher in the insoluble fraction. To analyze polysaccharides closely located with lignin, milled wood lignin (MWL), and cellulolytic enzyme lignin (CEL) obtained by enzyme treatment after DMSO/LiCl swelling were investigated. Although the xylan/mannan ratio of MWL was higher, that of CEL with more than 80% lignin yield was lower. |
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| Keywords: | Lignin hemicellulose syringyl ratio xylan/mannan ratio cell wall fraction |
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