Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, School of Light Industrial and Food Engineering, Guangxi University, Nanning 530004, PR China.
Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, PR China.
Bioresour Technol. 2023 Oct;385:129416. doi: 10.1016/j.biortech.2023.129416. Epub 2023 Jun 28.
Aromatic acids play a selective role in the separation of hemicellulose. Phenolic acids have demonstrated an inhibitory effect on lignin condensation. In the current study, vanillic acid (VA), which combines the characteristics of aromatic and phenolic acids, is used to separate eucalyptus. The efficient and selective separation of hemicellulose is achieved simultaneously at 170 °C, 8.0% VA concentration, and 80 min. The separation yield of xylose increased from 78.80% to 88.59% compared to acetic acid (AA) pretreatment. The separation yield of lignin decreased from 19.32% to 11.19%. In particular, the β-O-4 content of lignin increased by 5.78% after pretreatment. The results indicate that VA, as a "carbon positive ion scavenger", it preferentially reacts with the carbon-positive ion intermediate of lignin. Surprisingly, the inhibition of lignin condensation is achieved. This study provides a new starting point for the development of an efficient and sustainable commercial technology by organic acid pretreatment.
芳香酸在半纤维素的分离中起选择性作用。酚酸对木质素缩合表现出抑制作用。在本研究中，香草酸（VA）结合了芳香酸和酚酸的特性，被用于分离桉树。在 170°C、8.0%VA 浓度和 80 分钟的条件下，可同时实现半纤维素的高效和选择性分离。与乙酸（AA）预处理相比，木糖的分离收率从 78.80%增加到 88.59%。木质素的分离收率从 19.32%降低到 11.19%。特别是木质素的β-O-4 含量在预处理后增加了 5.78%。结果表明，VA 作为“碳正离子清除剂”，优先与木质素的碳正离子中间体反应。令人惊讶的是，木质素缩合的抑制作用得以实现。本研究为通过有机酸预处理开发高效、可持续的商业技术提供了新的起点。
