Abstract
Delignification of Broussonetia papyrifera during ethanol organosolv pretreatment was studied. Milled wood lignin (MWL), the ethanol organosolv lignin recovered at 5 min (PL5), 10 min (PL10), and 60 min (PL60) during the pretreatment, and the residual lignin (RL60) after the pretreatment were characterized and compared. GPC results demonstrated that the weight-average molecular weights (Mw) of the ethanol organosolv lignin fractions increased as the pretreatment time extended from 5 to 60 min. 31P NMR analysis revealed that the content of aliphatic OH decreased in the following order: RL60 < PL60 < PL5 < PL10 < MWL. HSQC NMR results suggested that the contents of syringyl, guaiacyl, p-hydroxybenzoate unit, phenylcoumaran, and resinol in the solubilized lignin fractions were significantly changed during the pretreatment. In addition, a significant portion of β-O-4 interunit linkages of lignin was cleaved during the pretreatment, leading to the formation of stilbene structures in lignin samples such as PL60.
| Original language | English |
|---|---|
| Pages (from-to) | 14767-14773 |
| Number of pages | 7 |
| Journal | ACS Sustainable Chemistry and Engineering |
| Volume | 6 |
| Issue number | 11 |
| DOIs | |
| State | Published - Nov 5 2018 |
Funding
LY, CC and HY are grateful for the support by the National Natural Science Foundation of China (No. 31500496), China Scholarship Council (No. 2011842330 and No. 201508420257), Key project of Hubei Provincial Department of Education (No. D20161402), and Key Laboratory of Pulp and Paper Science & Technology of Ministry of Education of China (NO. KF-201719 and NO. KF201611). Oak Ridge National Laboratory is managed by UT-Battelle, LLC under Contract DE-AC05-00OR22725 with the U.S. Department of Energy (DOE). The views and opinions of the authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights.
| Funders | Funder number |
|---|---|
| Key Laboratory of Pulp and Paper Science & Technology of Ministry of Education of China | KF201611, KF-201719 |
| U.S. Department of Energy | |
| Oak Ridge National Laboratory | |
| Hubei Provincial Department of Education | D20161402 |
| UT-Battelle | DE-AC05-00OR22725 |
| National Natural Science Foundation of China | 31500496 |
| China Scholarship Council | 2011842330, 201508420257 |
Keywords
- Broussonetia papyrifera
- Delignification
- Ethanol organosolv pretreatment
- Lignin characterization