竹子
木质素
碳-13核磁共振
乙醚
化学
有机化学
生物炼制
化学结构
聚合物
材料科学
原材料
复合材料
作者
Jia‐Long Wen,Shaolong Sun,Bai-Liang Xue,Run‐Cang Sun
标识
DOI:10.1016/j.ijbiomac.2015.03.044
摘要
A better understanding of the inhomogeneous molecular structure of lignin from bamboo is a prerequisite for promoting the “biorefinery” technologies of the bamboo feedstock. A mild and successive method for fractionating native lignin from bamboo species was proposed in the present study. The molecular structure and structural inhomogeneity of the isolated lignin polymers were comprehensively investigated by elemental analysis, carbohydrate analysis, state-of-the-art NMR and analytical pyrolysis techniques (quantitative 13C NMR, 13C-DEPT 135 NMR, 2D-HSQC NMR, 31P NMR, and pyrolysis–GC–MS). The results showed that the proposed method is effective for extracting lignin from bamboo. NMR results showed that syringyl (S) was the predominant unit in bamboo lignin over guaiacyl (G) and p-hydroxyphenyl (H) units. In addition, the lignin was associated with p-coumarates and ferulates via ester and ether bonds, respectively. Moreover, various substructures, such as β-O-4, β-β, β-5, β-1, and α,β-diaryl ether linkages, were identified and quantified by NMR techniques. Based on the results obtained, a proposed schematic diagram of structural heterogeneity of the lignin polymers extracted from the bamboo is presented. In short, well-defined inhomogeneous structures of native lignin from bamboo will facilitate further applications of bamboo in current biorefineries.
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