Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 61, Issue 46, Pages 11067-11075Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf403717q
Keywords
delignification; lignin; NMR; beta-O-4 linkages; structural elucidation
Funding
- National Natural Science Foundation of China [31110103902]
- Major State Basic Research Projects of China [973-2010CB732204]
- National 863 Project [863-2012AA023204]
- Fundamental Research Funds for the Central Universities [BLYJ201313]
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Effective delignification of lignocelluloses is a very important to guarantee the economic feasibility of organosolv-based biorefinery. Eucalyptus chips were successively subjected to organosolv pretreatment (AEOP) and extended delignification (ED) process in the present study. The effects of delignification processes were scientifically evaluated by component analysis, SEM, and CP-MAS NMR techniques. It was found that the integrated process of organosolv pretreatment and subsequent delignification resulted in an effective delignification. The fundamental chemistry of the lignin obtained after these processes was thoroughly investigated by FT-IR, multidimensional NMR (P-31-, C-13-, and 2D-HSQC NMR), and GPC techniques. It was observed that an extensive cleavage of aryl ether linkages, ethoxylation, and some condensation reactions occurred in AEOP process, while a-oxidation mainly took place in alkaline hydrogen peroxide (AHP) process. It is believed that better understanding the fundamental chemistry of lignin facilitates the optimization of the delignification process. More importantly, well-defined of lignin polymers will facilitate their value-added applications in current and future biorefineries.
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