文献类型：期刊文献

英文题名：Improving cellulosic ethanol fermentation efficiency by converting endogenous water-soluble carbohydrates into citric acid before pretreatment

作者：Dong, Weitao[1];Han, Xushen[1];Liu, Gang[1,2];Bao, Jie[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Bioreactor Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Minist Agr, Biogas Inst, Key Lab Dev & Applicat Rural Renewable Energy, Chengdu 610041, Sichuan, Peoples R China

年份：2019

卷号：42

期号：7

起止页码：1099

外文期刊名：BIOPROCESS AND BIOSYSTEMS ENGINEERING

收录：;EI(收录号：20191506765472);WOS:【SCI-EXPANDED(收录号:WOS:000474372100002)】；

基金：This research was supported by the China Postdoctoral Science Foundation (2018M632043), the Fundamental Research Funds for the Central Universities of China (WF1814033), and the Open Funding Project of the Key Laboratory of Development and Application of Rural Renewable Energy.

语种：英文

外文关键词：Water-soluble carbohydrates; Solid-state citric acid fermentation; Hydroxymethylfurfural; Corn stover; Cellulosic ethanol

摘要：Water-soluble carbohydrates in raw lignocellulosic biomass are converted into hydroxymethylfurfural (HMF) in the acid-based pretreatment, thus increasing the detoxification intensity and reducing the fermentation efficiency of cellulosic ethanol. Therefore, reducing water-soluble carbohydrates in raw corn stover is crucially important to reduce the inhibitors' generation and improve the ethanol fermentation efficiency. In this study, aerobic solid-state fermentation of corn stover by inoculating Aspergillus niger spores converted 83% of the endogenous water-soluble carbohydrates into citric acid, leading to the decrease of 41% of HMF generation and 8% of sulfuric acid usage during the dry acid pretreatment. The reduced inhibitor generation improved the ethanol fermentability by 11% more ethanol than that of the corn stover without water-soluble carbohydrates' removal. This suggests that the removal of the water-soluble carbohydrates before pretreatment significantly reduced the inhibitors' generation in pretreatment and improved the fermentation efficiency of cellulosic ethanol.