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| Effect of NaOH pretreatments on cellulosic structure and enzymatic hydrolysis of corn stover |
| Received:December 14, 2015 |
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| KeyWord:corn stover;NaOH pretreatment;chemical composition;cellulosic structure;enzymatic hydrolysis |
| Author Name | Affiliation | E-mail | | ZHAO Jing | College of Life Science, Dalian Nationalities University, Key Laboratory of Biochemical Engineering of State Ethnic Affairs CommissionMinistry of Education, Dalian 116600, China | | | ZHANG Fu-rong | College of Life Science, Dalian Nationalities University, Key Laboratory of Biochemical Engineering of State Ethnic Affairs CommissionMinistry of Education, Dalian 116600, China | | | CHEN Ming | School of Biological Engineering, Dalian Polytechnic University, Dalian 116034, China | chenming@dlpu.edu.cn | | XU Chen | College of Life Science, Dalian Nationalities University, Key Laboratory of Biochemical Engineering of State Ethnic Affairs CommissionMinistry of Education, Dalian 116600, China | | | QUAN Chun-shan | College of Life Science, Dalian Nationalities University, Key Laboratory of Biochemical Engineering of State Ethnic Affairs CommissionMinistry of Education, Dalian 116600, China | | | FAN Sheng-di | College of Life Science, Dalian Nationalities University, Key Laboratory of Biochemical Engineering of State Ethnic Affairs CommissionMinistry of Education, Dalian 116600, China | |
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| Abstract: |
| Corn stover biomass is an important source of bioenergy. However, lignin in corn stover profoundly reduces its enzymatic degradation. Here the influences of sodium hydroxide pretreatments under different temperatures (60 ℃, 80 ℃ and 105 ℃) on cellulosic structure characteristics and enzymatic hydrolysis yields of corn stover were investigated. The cellulosic structures of raw and alkali-pretreated corn stover were characterized using Scanning Electron Microscopy (SEM), X-ray Diffractometer (XRD) and Fourier Transform In frared Spectrometer (FTIR). Results showed that alkaline pretreatments of corn stover effectively removed lignin, and increased the ratios of cellulose and hemicellulose and the crystallinity of cellulose, resulting in more porous cellulosic structure. After pretreatments with dilute NaOH solution under 80 ℃ for 1 h, the crystallinity of cellulose of corn stover residues reached to 63.7% and the yield of enzymatic hydroly sis to 71.4% after 60 h. High pretreatment temperature caused exposure of pits on fiber surface and reformation of hydrogen bonds in cellu lose molecules, causing further losses of hemicellulose, reduction of cellulose swelling degree and decrease of enzymatic hydrolysis yield. The present findings suggest that alkaline pretreatment under 80 ℃ would be the optimum condition for improving the structural characteris tics and facilitating the conversion to saccharides from cellulose. |
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