Comparison of four different chemical pretreatments of corn stover for enhancing enzymatic digestibility
Comparison of four different chemical pretreatments of corn stover for enhancing enzymatic digestibility
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DOI：
10.1016/j.biombioe.2009.05.025
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发表时间：
2009-10-01
影响因子：
6
通讯作者：
Xia, Liming
中科院分区：
文献类型：
--
作者：
Chen, Ming;Zhao, Jing;Xia, Liming
四种常用的化学预处理工艺的基础上稀酸，石灰，氨水浸泡，然后稀酸水解，和氢氧化钠，进行了评估，以提供比较性能数据。预处理玉米秸秆的酶消化率与木质素去除率呈正相关。与其他三种预处理相比，2%NaOH预处理显著提高了木质素的去除率，提高了纤维素的可及性和可消化性。当底物浓度为8.0%，纤维素酶用量为20 FPU g（-1）底物时，NaOH预处理玉米秸秆48 h水解率可达81.2%。化学分析表明，NaOH预处理玉米秸秆酶解液中可发酵糖含量较高，抑制物较少，适合后续发酵生产乙醇。研究结果对可再生木质纤维素生物质的生物转化和利用具有重要意义。(C)2009爱思唯尔有限公司保留所有权利。
Four commonly used chemical pretreatment processes based on dilute acid, lime, aqueous ammonia steeping followed by dilute acid hydrolysis, and sodium hydroxide, were evaluated to provide comparative performance data. An obverse correlation between lignin removal and enzymatic digestibility of pretreated corn stover was observed. Compared with other three pretreatments, pretreatment of corn stover with 2% NaOH substantially increased the lignin removal and enhanced the accessibility and digestibility of cellulose. The hydrolysis yield of NaOH-pretreated corn stover reached 81.2% by 48 h at 8.0% substrate concentration and cellulase dosage of 20 FPU g(-1) substrate. Chemical analysis showed that the enzymatic hydrolysate from NaOH-pretreated corn stover contained higher content of fermentable sugars and less inhibitors, which is suitable for subsequent fermentation process to produce ethanol. The research results are meaningful in bioconversion and utilization of renewable lignocellulosic biomass. (C) 2009 Elsevier Ltd. All rights reserved.