Bao Yuqi, Zhu Jiatian, Zeng Fanyan, Li Jiao, Wang Shanshan, Qin Chengrong, Liang Chen, Huang Caoxing, Yao Shuangquan
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. 2022 Nov;364:128082. doi: 10.1016/j.biortech.2022.128082. Epub 2022 Oct 7.
Organic acid pretreatments can efficiently separate biomass-based hemicellulose and selectively produce hemicellulose-derived sugars. In this study, hemicellulose is separation as xylose, oligosaccharides in the tropic acid-catalyzed hydrothermal pretreatment of eucalyptus. The maximum yield of hemicellulose-derived sugars (85.78 %) with 71.25 % xylose selectivity (based on the total xylose in raw material) was achieved in the hydrolysate under optimal conditions (5 % TA, 160 ℃, 80 min). The yield of hemicellulose-derived sugar and the separation yield of hemicellulose increased by 11.06 % and 11.45 % compared with glycolic acid pretreatment in the similar severity factor. The separation yield of cellulose and lignin was decreased by 4.23 % and 0.98 %, respectively. This resulted in residual solids with higher biological stability (higher fiber crystallinity index, higher thermal stability, and higher lignin content). Therefore, higher hemicellulose separation selectivity and rich hemicellulose-derived sugars were obtained using TA pretreatment. The work would bring up a new method for biomass refining.
有机酸预处理能够有效地分离生物质基半纤维素，并选择性地生产半纤维素衍生糖。在本研究中，在热带酸催化的桉树水热预处理过程中，半纤维素被分离为木糖、低聚糖。在最佳条件（5% 热带酸、160℃、80分钟）下，水解产物中半纤维素衍生糖的最大产率达到85.78%，木糖选择性为71.25%（基于原料中总木糖含量）。与在相似 severity 因子下的乙醇酸预处理相比，半纤维素衍生糖的产率和半纤维素的分离产率分别提高了11.06%和11.45%。纤维素和木质素的分离产率分别降低了4.23%和0.98%。这导致残余固体具有更高的生物稳定性（更高的纤维结晶度指数、更高的热稳定性和更高的木质素含量）。因此，使用热带酸预处理可获得更高的半纤维素分离选择性和丰富的半纤维素衍生糖。这项工作将为生物质精炼带来一种新方法。
