Lignin–carbohydrate complexes (LCCs) are important from the perspective of the anti-depolymerization barrier of lignocellulosic biomass, as it limits the high-value utilization of lignocellulosic biomass resources. In this study, the unit structure of lignin in the LCC has been investigated in depth. Oxidation of a selective lignin unit by chlorine dioxide revealed that the LCC structures are enriched with xylanase-macroporous resins, and the structure that was not oxidized in LCC was also identified. At a chlorine dioxide concentration of 90.93 mg/L, 1 g of LCC lignin is oxidized by 0.7 g chlorine dioxide. The purified residual hemicellulose lignin was mainly H-type. The β-O-4′ signal was the strongest for the bond between lignin and carbohydrates. Therefore, it is speculated that most of the residual lignin in bamboo-alkali hemicellulose exists in the form of non-phenolic structural units. This study provides a reference for further studies on the specific structures of LCC.

从木质纤维素生物质的抗解聚屏障的角度来看，木质素-碳水化合物复合物（LCCs）很重要，因为它限制了木质纤维素生物质资源的高值利用。在这项研究中，深入研究了 LCC 中木质素的单元结构。二氧化氯对选择性木质素单元的氧化表明，LCC 结构富含木聚糖酶-大孔树脂，并且还确定了 LCC 中未被氧化的结构。在二氧化氯浓度为 90.93 mg/L 时，1 g LCC 木质素会被 0.7 g 二氧化氯氧化。纯化后的残留半纤维素木质素主要为H型。β-O-4'信号对于木质素和碳水化合物之间的键合是最强的。所以，据推测，竹碱半纤维素中残留的木质素大部分以非酚类结构单元的形式存在。本研究为进一步研究LCC的具体结构提供了参考。