Abstract：
:An integrated process based on ionic liquids ([Bmim]Cl and [Bmim]OAc) pretreatment and successive alkali post-treatments (0.5, 2.0, and 4.0% NaOH at 90°C for 2h) was performed to isolate lignins from Eucalyptus. The structural features and spatial distribution of lignin in the Eucalyptus cell wall were investigated thoroughly. Results revealed that the ionic liquids pretreatment promoted the isolation of alkaline lignin from the pretreated samples without obvious structural changes. Additionally, the integrated process resulted in syringyl-rich lignin macromolecules with more β-O-4' linkages and less phenolic hydroxyl groups. Confocal Raman microscopy analysis showed that the dissolution behavior of lignin was varied in the morphologically distinct regions during the successive alkali treatments, and lignin dissolved was mainly stemmed from the secondary wall regions. These results provided some useful information for understanding the mechanisms of delignification during the integrated process and enhancing the potential utilizations of lignin in future biorefineries.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Li HY,Wang CZ,Chen X,Cao XF,Sun SN,Sun RCdoi
10.1016/j.biortech.2016.09.111subject
Has Abstractpub_date
2016-12-01 00:00:00pages
175-181eissn
0960-8524issn
1873-2976pii
S0960-8524(16)31378-5journal_volume
222pub_type
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