Cheng Jinyuan, Huang Chen, Zhan Yunni, Liu Xuze, Wang Jia, Huang Caoxing, Fang Guigan, Ragauskas Arthur J, Xie Zhanghong, Meng Xianzhi
Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Jiangsu Province Key Laboratory of Biomass Energy and Materials, Nanjing 210042, China.
Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Jiangsu Province Key Laboratory of Biomass Energy and Materials, Nanjing 210042, China; Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China.
Bioresour Technol. 2023 Nov;387:129653. doi: 10.1016/j.biortech.2023.129653. Epub 2023 Aug 11.
The failure of hemicellulose valorization in a deep eutectic solvent (DES) pretreatment has become a bottleneck that challenges its further development. To address this issue, this study developed a DES/GVL (γ-valerolactone) biphasic system for effective hemicellulose-furfural conversion, enhanced cellulose saccharification and lignin isolation. The results indicated that the biphasic system could significantly improve the lignin removal (as high as 89.1%), 86.0% higher than the monophasic DES, accompanied by ∼100% hemicellulose degradation. Notably, the GVL in the biphasic solvent restricted the condensation of hemicellulose degradation products, which as a result generated large amount of furfural in the pretreatment liquid with a yield of 68.6%. With the removal of hemicellulose and lignin, cellulose enzymatic hydrolysis yield was boosted and reached near 100%. This study highlighted that the novel DES/GVL is capable of fractionating the biomass and benefiting their individual utilization, which could provide a new biorefinery configuration for a DES pretreatment.
在深共熔溶剂（DES）预处理中，半纤维素增值失败已成为阻碍其进一步发展的瓶颈。为解决这一问题，本研究开发了一种用于有效实现半纤维素向糠醛转化、增强纤维素糖化作用及分离木质素的DES/γ-戊内酯（GVL）双相体系。结果表明，该双相体系可显著提高木质素去除率（高达89.1%），比单相DES高86.0%，同时半纤维素降解率约为100%。值得注意的是，双相溶剂中的GVL抑制了半纤维素降解产物的缩合，从而在预处理液中产生了大量糠醛，产率为68.6%。随着半纤维素和木质素的去除，纤维素酶解产率得到提高，接近100%。本研究强调，新型DES/GVL能够对生物质进行分级并有利于其单独利用，可为DES预处理提供一种新的生物精炼配置。
