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Enhanced enzymatic saccharification of sugarcane bagasse pretreated by sodium methoxide with glycerol

Lv, Xiaojing, Lin, Jianghai, Luo, Liang, Zhang, Dou, Lei, Senlin, Xiao, Wenjuan, Xu, Yuan, Gong, Yingxue, Liu, Zehuan
Bioresource technology 2018 v.249 pp. 226-233
Fourier transform infrared spectroscopy, X-ray diffraction, biorefining, delignification, enzymatic hydrolysis, glycerol, lignocellulose, physicochemical properties, response surface methodology, saccharification, scanning electron microscopy, sodium, sugarcane bagasse
Sodium methoxide (CH3ONa) with glycerol pretreatment (CWGP) was performed to improve the enzymatic digestibility of sugarcane bagasse (SCB). Response surface methodology was utilized to optimize the CWGP parameters for pretreating SCB from the perspective of total fermentable sugar yield (TFSY) and total fermentable sugar concentration (TFSC). Under the optimal CWGP conditions, 0.5666g/g of TFSY (0.82% CH3ONa, 1.11h, 150°C) and 17.75g/L of TFSC (0.87% CH3ONa, 1.38h, 149.27°C) were achieved, corresponding to delignification of 79.05% and 79.34%, respectively. Compared the pretreatment using glycerol or CH3ONa alone, the CWGP has significant synergies to enhance the enzymatic efficiency of SCB. The physical and chemical characteristics of untreated and pretreated SCBs were analyzed using FT-IR, XRD, and SEM, and the results suggest that CWGP significantly increased the susceptibility of the substrates to enzymatic digestibility. Ultimately, CWGP might be a prospective candidate for the pretreatment process of enzyme-based lignocellulosic biorefineries.