Mild O2-aided alkaline pretreatment effectively improves fractionated efficiency and enzymatic digestibility of Napier grass stem towards a sustainable biorefinery
Mild O2-aided alkaline pretreatment effectively improves fractionated efficiency and enzymatic digestibility of Napier grass stem towards a sustainable biorefinery
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DOI：
10.1016/j.biortech.2020.124162
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发表时间：
2021-01-01
影响因子：
11.4
通讯作者：
Zhang, Junhua
中科院分区：
文献类型：
--
作者：
Song, Weipeng;Peng, Lincai;Zhang, Junhua
纳皮耶草是一种适应性强、生产力高的优良能源作物。采用O2-辅助碱预处理技术对纳皮耶草茎进行结构修饰，以提高其分级效率和酶消化率。与常规碱法预处理相比，在较低的温度（80 ℃）和稀NaOH溶液（1%）下进行，可去除80%以上的木质素，保留92%的纤维素。回收的木质素具有天然木质素的典型结构和较好的分子量，有望用于制备生物材料或芳香化学品。结合预处理后固体残渣和水解液的酶解处理，以原料料计，葡萄糖和木糖的回收率分别达到89.7%和90.2%。这一贡献证明了一种高度可靠的策略，以压裂纳皮耶草茎，以最大限度地提高发酵糖的产量，并使木质素向可持续的生物精炼工艺增值。
Napier grass is a promising energy source on account of its strong adaptability and high productivity. Herein, an O-2-aided alkaline pretreatment with mild operating conditions was developed to modify Napier grass stem structure for improving its fractionated efficiency and enzymatic digestibility. Compared with the conventional alkaline pretreatment, it could be proceeded at lower temperature (80 degrees C) and dilute NaOH solution (1%) to remove over 80% lignin and retain 92% cellulose. The recovered lignin possessed typical structures of native lignin and well-preserved molecular weight, anticipating feasible potential in preparation of biomaterials or aromatic chemicals. Coupled with the enzymatic hydrolysis managements of solid remain and hydrolysate after the pretreatment, the recovery yields of glucose and xylose based on the raw material feeds reached 89.7% and 90.2%, respectively. This contribution demonstrates a highly-reliable strategy to fractionate Napier grass stem for maximizing fermentation sugar production and valorizing lignin toward sustainable biorefinery processes.