Isolation and Characterization of Lignin-based on Complete Dissolution System
In order to obtain the complete chemical structure of lignin and comprehensively and profoundly analyze the structural characteris-tics of lignin,using poplar wood with ball milling for 2 h as raw material,the dissolving regenerative enzymolysis poplar lignin(DEL)was ob-tained by treatment of LiCl/DMSO system dissolution and regeneration,enzymatic hydrolysis,followed by extraction and purification.Com-pared with single cellulose enzymosis poplar lignin(CEL),the yield and purity of DEL were 42.1%and 39 g/kg,respectively,which were higher than those of CEL.The results showed that the molecular weight of DEL was lower and its dispersity was better,and the lignin with lower molecular weight dissolved more during the separation process.The condensation degree of DEL was characterized by an alkaline nitro-benzene oxidation reaction,which further demonstrated that DEL was GS-type lignin,and the proportion of uncondensed structural units with condensation degree of lignin did not change during the separation process.
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