University of Coimbra, CQC, Department of Chemistry, Rua Larga, 3004-535 Coimbra, Portugal.
University of Coimbra, CQC, Department of Chemistry, Rua Larga, 3004-535 Coimbra, Portugal.
Int J Biol Macromol. 2021 Apr 30;177:294-305. doi: 10.1016/j.ijbiomac.2021.02.088. Epub 2021 Feb 16.
Lignocellulosic biomass is a renewable and sustainable feedstock, mainly composed of cellulose, hemicellulose, and lignin. Lignin, as the most abundant natural aromatic polymer occurring on Earth, has great potential to produce value-added products. However, the isolation of highly pure lignin from biomass requires the use of efficient methods during lignocellulose fractionation. Therefore, in this work, novel acidic deep eutectic solvents (DESs) were prepared, characterized and screened for lignin extraction from maritime pine wood (Pinus pinaster Ait.) sawdust. The use of cosolvents and the development of new DES were also evaluated regarding their extraction and selectivity performance. The results show that an 1 h extraction process at 175 °C, using a novel DES composed of lactic acid, tartaric acid and choline chloride, named Lact:Tart:ChCl, in a molar ratio of 4:1:1, allows the recovery of 95 wt% of the total lignin present in pine biomass with a purity of 89 wt%. Such superior extraction of lignin with remarkable purity using a "green" solvent system makes this process highly appealing for future large-scale applications.
木质纤维素生物质是一种可再生和可持续的原料，主要由纤维素、半纤维素和木质素组成。木质素作为地球上最丰富的天然芳香族聚合物，具有生产高附加值产品的巨大潜力。然而，要从生物质中分离出高度纯净的木质素，需要在木质纤维素分级过程中使用高效的方法。因此，在这项工作中，我们制备、表征并筛选了新型酸性深共熔溶剂（DESs），用于从马尾松木屑中提取木质素。还评估了共溶剂的使用和新型 DES 的开发对其提取和选择性性能的影响。结果表明，在 175°C 下，使用一种新型 DES（由乳酸、酒石酸和氯化胆碱以 4:1:1 的摩尔比组成，命名为 Lact:Tart:ChCl）进行 1 小时的提取过程，可以回收 95wt%的总木质素，其纯度为 89wt%。这种使用“绿色”溶剂体系实现的高纯度木质素的优异提取，使得该工艺在未来的大规模应用中极具吸引力。
