Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.
Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China; Chemical & Biological Engineering Department, Montana State University, Bozeman, MT 59717, United States.
Int J Biol Macromol. 2020 Dec 1;164:4662-4670. doi: 10.1016/j.ijbiomac.2020.09.074. Epub 2020 Sep 15.
Understanding the structure and properties of lignin has important practical significance for its further applications. In this case, eucalyptus was fractionated with 88% formic acid at 101 °C for different durations, and the removal efficiency as well as the chemical structure of lignin at various stages were comparatively analyzed. The obtained data indicated that with increasing reaction time, lignin was continuously removed and the process could be divided into three stages. The lignin dissolution rate was fast first and then slow, and the molecular weight of the dissolved lignin increased with time. The lignin structure was condensed and the molecular weight increased with prolonged of reaction time. Structural analysis indicated that the β-O-4' structure was largely destroyed, the G-type lignin dissolved early, and the degradation of the S-type lignin became more intensive with increasing reaction time. This is of great help for reaction control as well as the further processing of lignin byproducts.
了解木质素的结构和性质对其进一步应用具有重要的实际意义。在这种情况下，用 88%的甲酸在 101°C 下对桉树进行分级，不同时间下木质素的去除效率和化学结构进行了比较分析。所得数据表明，随着反应时间的增加，木质素不断被去除，该过程可分为三个阶段。木质素的溶解速率先快后慢，溶解木质素的分子量随时间增加而增加。木质素结构被浓缩，分子量随反应时间的延长而增加。结构分析表明，β-O-4'结构被大量破坏，G 型木质素早期溶解，随着反应时间的增加，S 型木质素的降解变得更加剧烈。这对反应控制以及木质素副产物的进一步加工都有很大的帮助。
