Department of New Energy Science & Engineering, College of Materials & Metallurgy, Guizhou University, West Campus, Huaxi District, Guiyang, China.
Bioenergy Division, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, CAS, 457#Zhongshan Road, Dalian, China.
Carbohydr Polym. 2019 Jan 15;204:50-58. doi: 10.1016/j.carbpol.2018.09.085. Epub 2018 Oct 1.
To overcome the natural recalcitrance of cellulose for glucose production in aqueous media catalyzed by enzyme, in this study, a dissolution pretreatment strategy was developed by using in situ formed CO-based reversible ionic compounds (RICs)/DMSO mixed organic electrolytes under mild conditions. The influences of the constitution of RICs, CO pressure, dissolution pretreatment time on the physic-chemical structure of cellulose were investigated systematically by FTIR, XRD, SEM, AFM towards in-depth understanding of the correlations between the pretreatment conditions, micro-scale structure and enzymatic saccharification of cellulose. The results showed that the tetramethyl guanidine (TMG) based RICs solvent system [TMGH][OCOCHCHOCO]/DMSO (X = 0.1, X: the mole fraction of the formed RICs in the mixture) presented the best performance, which was evidenced by 100% glucose yield after the dissolution-regeneration pretreatment strategy under mild conditions (T = 60 °C, Pco = 2.0 MPa, t = 2 h). Furthermore, the solvent system have good recyclability and usability.
为克服酶在水相介质中催化葡萄糖生产时纤维素固有的天然抗降解性，本研究采用原位形成的 CO 基可逆离子化合物（RICs）/DMSO 混合有机电解质，在温和条件下开发了一种溶解预处理策略。通过 FTIR、XRD、SEM 和 AFM 系统研究了 RICs 的组成、CO 压力、溶解预处理时间对纤维素物理化学结构的影响，深入了解预处理条件、纤维素的微观结构和酶解之间的相关性。结果表明，四甲基胍（TMG）基 RICs 溶剂体系[TMGH][OCOCHCHOCO]/DMSO（X=0.1，X：混合物中形成的 RICs 的摩尔分数）表现出最佳性能，在温和条件下（T=60°C，Pco=2.0 MPa，t=2 h）通过溶解-再生预处理策略可实现 100%的葡萄糖产率。此外，该溶剂体系具有良好的可回收性和实用性。
