College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Hexing Road 26, Harbin 150040, PR China; Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin 150040, PR China.
The College of Forestry, Beijing Forestry University, Beijing 100083, PR China.
Bioresour Technol. 2023 Feb;370:128570. doi: 10.1016/j.biortech.2022.128570. Epub 2022 Dec 31.
A novel ternary deep eutectic solvent (DES), consisted of choline chloride, oxalic acid and ethylene glycol, was developed as a green, low-cost and recyclable pretreatment system for multi-stage utilization of Eucommia ulmoides seed shells. Under optimum conditions, 79.7 % hemicellulose and 65.6 % lignin were quickly removed while 84.0 % cellulose was retained. After DES pretreatment, the yield and purity of gutta-percha achieved 85.1 mg/g and 96.2 %, which increased 1.4 and 1.8 folds higher than that of un-treatment ones. Meanwhile, 69.1 % enzymatic digestibility of cellulose was obtained, that was 2.3 folds higher than that of raw substrates. Moreover, 53.6 % low-condensation lignin with aromatic structures and valuable aryl-ether linkages was well collected. Importantly, the DES that has been recycled five runs can still remove 73.9 % hemicellulose and 58.0 % lignin. Overall, the DES was determined to efficiently promote the separation and conversion of high-quality gutta-percha, value-added lignin and high-yield glucose from Eucommia ulmoides seed shells.
一种新型三元深共晶溶剂（DES），由氯化胆碱、草酸和乙二醇组成，被开发为一种绿色、低成本和可回收的预处理系统，用于杜仲种子壳的多阶段利用。在最佳条件下，79.7%的半纤维素和 65.6%的木质素被迅速去除，而 84.0%的纤维素得以保留。DES 预处理后，杜仲胶的产率和纯度分别达到 85.1mg/g 和 96.2%，比未处理的分别提高了 1.4 倍和 1.8 倍。同时，纤维素的酶解率达到 69.1%，比原底物提高了 2.3 倍。此外，还很好地收集到了 53.6%具有芳香结构和有价值的芳基-醚键的低缩合木质素。重要的是，经过五次循环使用的 DES 仍能去除 73.9%的半纤维素和 58.0%的木质素。总的来说，DES 有效地促进了杜仲种子壳中高质量杜仲胶、附加值木质素和高产葡萄糖的分离和转化。
