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Co-extraction of soluble and insoluble sugars from energy sorghum based on a hydrothermal hydrolysis process

Author:
Yu, Qiang, Tan, Xuesong, Zhuang, Xinshu, Wang, Qiong, Wang, Wen, Qi, Wei, Zhou, Guixiong, Luo, Yu, Yuan, Zhenhong
Source:
Bioresource technology 2016 v.221 pp. 111-120
ISSN:
0960-8524
Subject:
arabinose, biomass production, cell walls, cellulose, chemical composition, crystal structure, energy, enzymatic hydrolysis, hemicellulose, hydrolysis, lignin, xylose
Abstract:
A process for co-extraction of soluble and insoluble sugars from energy sorghum (ES) was developed based on hydrothermal hydrolysis (HH). Two series of ES were investigated: one (N) with a high biomass yield displayed a higher recalcitrance to sugar release, whereas the second (T) series was characterized by high sugar extraction. The highest total xylose recoveries of 87.2% and 98.7% were obtained for N-11 and T-106 under hydrolysis conditions of 180°C for 50min and 180°C for 30min, respectively. Moreover, the T series displayed higher enzymatic digestibility (ED) than the N series. The high degree of branching (arabinose/xylose ratio) and acetyl groups in the hemicellulose chains of T-106 would be expected to accelerate sugar release during the HH process. In addition, negative correlations between ED and the lignin content, crystallinity index (CrI) and syringyl/guaiacyl (S/G) lignin ratio were observed. Furthermore, finding ways to overcome the thickness of the cell wall and heterogeneity of its chemical composition distribution would make cellulose more accessible to the enzyme.
Agid:
5508595