木质素
芦竹
解聚
化学
离子液体
有机化学
乙醚
细胞壁
化学工程
生物量(生态学)
生物化学
工程类
催化作用
海洋学
地质学
作者
Tingting You,Liming Zhang,Siqin Guo,Lupeng Shao,Feng Xu
标识
DOI:10.1021/acs.jafc.5b04831
摘要
Solid acid-enhanced ionic liquid (IL) pretreatment is of paramount importance for boosting the yield of sugars from biomass cost-effectively and environmentally friendly. To unravel the chemical and supramolecular structural changes of lignin after pretreatment, IL–acid lignin (ILAL) and subsequent residual cellulolytic enzyme lignin (RCEL) were isolated from Arundo donax Linn. The structural features were compared with those of the corresponding milled wood lignin (MWL). Results indicated that the pretreatment caused loss of β-O-4′, β-β′, β-1′ linkages and formation of condensed structures in lignin. A preferential breakdown of G-type lignin may have occurred, evidenced by an increased S/G ratio revealed by 2D HSQC NMR analysis. It was determined that the depolymerization of β-O-4′ linkage, lignin recondensation, and cleavage of ferulate–lignin ether linkages took place. Moreover, a simulation module was first developed to define morphological changes in lignin based on AFM and TEM analyses. Briefly, tree branch like aggregates was destroyed to monodisperse particles.
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