In-depth identification of phenolics fractionated from Eucalyptus kraft lignin
In-depth identification of phenolics fractionated from Eucalyptus kraft lignin
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深入鉴定从桉树硫酸盐木质素中分馏的酚类物质
DOI：
10.1002/adsu.202100406
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发表时间：
2022
影响因子：
7.1
通讯作者：
Yue Fengxia
中科院分区：
文献类型：
--
作者：
Wang Jiangli;Zhao Chengke;Zhang Tanhao;Yang Linjie;Chen Honglei;Yue Fengxia
硫酸盐木质素，制浆工业的主要副产品，是丰富的。然而，高度未被充分利用的芳香资源。它是有用的，因为它的规模巨大。在合适的情况下，作为燃料、化学品和功能材料的来源。应用后处理。它被认为是化石能源的可再生替代品。由于硫酸盐木质素极其复杂，组成深入。分析和化学结构鉴定对开发至关重要。有效的增值策略。这项工作从人物塑造开始。并以木质素衍生酚类化合物的鉴定为代表。用单一溶剂选择性分馏后的硬木（桉树）硫酸盐木质素。先进二维异核单量子相干（HSQC）核。核磁共振（NMR）， 31P核磁共振和质谱相结合。用合成的真品化合物进行结构鉴定。硫酸盐木质素的低分子量组分。共有20种酚类化合物，。包括几种新型单体（儿茶酚）、二聚体（二乙烷）、。二乙烯等)和具有三苯基结构的三聚体。在桉树中鉴定出卡夫木质素。此外，还检测到多硫化物。分子量分数低，说明氧化聚合。S2−/HS−在硫酸盐制浆过程中产生。更好的理解。硫酸盐木质素，特别是低mw馏分，有望为木质素的选择性分馏和增值提供必要的信息。
Kraft lignin, the principal by-product of the pulping industry, is an abundant.yet highly underutilized aromatic resource. It is useful due to the vast scales.involved as a source of fuels, chemicals, and functional materials when suitable.postprocessing is applied. It is deemed to be a renewable alternative to fossil.sources. Because of the extreme complexity of kraft lignin, in-depth composition.analysis and chemical structural identification are crucial for the development.of effective valorization strategies. This work embarks on the characterization.and identification of lignin-derived phenolic compounds in representative.hardwood (Eucalyptus) kraft lignin after selective fractionation using a single.solvent. Advanced 2D heteronuclear single quantum coherence (HSQC) nuclear.magnetic resonance (NMR), 31P NMR, and mass spectrometry in combination.with synthetic authentic compounds are used for the structural identification of.the low-molecular-weight fraction of kraft lignin. A total of 20 phenolic compounds,.including several novel monomers (catechols), dimers (diarylethanes,.diarylethenes, etc.), and trimers with triphenyl structures are systematically.identified in the Eucalyptus kraft lignin. In addition, polysulfide is detected in the.low-molecular-weight fraction, indicating that the oxidative polymerization of.S2−/HS− occurrs during the kraft pulping process. An improved understanding.of kraft lignin, especially the low-Mw fraction, is expected to provide essential.information for the selective fractionation and valorization of lignin.