title: Liquid hot water pretreatment of energy grasses and its influence of physico-chemical changes on enzymatic digestibility.
abstract: Pennisetum hybrid I, II and switchgrass were pretreated with liquid hot water to enhance the release of sugars. The optimum hydrolysis factor for three energy grasses was 5.98, and the total xylose yield was 88.4%, 98.1% and 83.6% for grass I, II and S. It was indicated that the ratio of syringyl and guaiacyl units of lignin played an important role on the hemicellulose hydrolysis in LHW than branch degree, but latter contributed more on the characterization of xylooligomers degree of polymerization. Moreover, the analysis of multi-scale changes of substrate suggested that cellulose crystallinity index and degree of polymerization seemed no direct relationships for increase of enzymatic digestibility. While lignin barrier was the main factor limiting efficiency of sugar release, and Pennisetum hybrid with low lignin content and high sugar recovery was proved to be a prospective plant feedstock for cellulosic ethanol production.
authors.affiliation: Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Yu
authors.affiliation: Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100039, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Liu
authors.affiliation: Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China. Electronic address: Zhuangxs@ms.giec.ac.cn.
authors.forename: Xinshu
authors.initials: X
authors.lastname: Zhuang
authors.affiliation: Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China.
authors.forename: Zhenhong
authors.initials: Z
authors.lastname: Yuan
authors.affiliation: Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China.
authors.forename: Wen
authors.initials: W
authors.lastname: Wang
authors.affiliation: Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Qi
authors.affiliation: Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100039, China.
authors.forename: Qiong
authors.initials: Q
authors.lastname: Wang
authors.affiliation: Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China.
authors.forename: Xuesong
authors.initials: X
authors.lastname: Tan
authors.affiliation: Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China.
authors.forename: Xiaoying
authors.initials: X
authors.lastname: Kong
mesh_terms: D002480:Cellulase / Q000378:metabolism*; D002482:Cellulose / Q000378:metabolism; D003460:Crystallization; D006358:Hot Temperature; D006868:Hydrolysis; D008031:Lignin / Q000378:metabolism; D009844:Oligosaccharides / Q000032:analysis; D008897:Panicum / Q000737:chemistry / Q000187:drug effects; D031782:Pennisetum / Q000737:chemistry / Q000187:drug effects; D006109:Poaceae / Q000737:chemistry* / Q000187:drug effects; D058105:Polymerization; D011134:Polysaccharides / Q000378:metabolism; D014867:Water / Q000494:pharmacology*; D014994:Xylose / Q000737:chemistry
chemical_list: D009844:Oligosaccharides; D011134:Polysaccharides; D014867:Water; C007916:hemicellulose; D002482:Cellulose; D008031:Lignin; D014994:Xylose; D002480:Cellulase
keywords: Biomass recalcitrance; Energy grasses; Enzymatic digestibility; Liquid hot water pretreatment