Enhanced lignin removal and enzymolysis efficiency of grass waste by hydrogen peroxide synergized dilute alkali pretreatment,Bioresource Technology

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Enhanced lignin removal and enzymolysis efficiency of grass waste by hydrogen peroxide synergized dilute alkali pretreatment
Bioresource Technology ( IF 9.7 ) Pub Date : 2020-01-09 , DOI: 10.1016/j.biortech.2020.122756
Xing Yan ₁ , Jing-Rong Cheng ₂ , Yu-Tao Wang ₃ , Ming-Jun Zhu ₄

Affiliation

School of Biology and Biological Engineering, South China University of Technology, Guangzhou Higher Education Mega Center, Panyu, Guangzhou 510006, People's Republic of China.
School of Biology and Biological Engineering, South China University of Technology, Guangzhou Higher Education Mega Center, Panyu, Guangzhou 510006, People's Republic of China; Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences, Key Laboratory of Functional Foods, Ministry of Agriculture, Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, PR China.
College of Life and Geographic Sciences, Kashi University, Kashi 844000, China; Key Laboratory of Biological Resources and Ecology of Pamirs Plateau in Xinjiang Uygur Autonomous Region, Key Laboratory of Ecology and Biological Resources in Yarkand Oasis at Colleges & Universities under the Department of Education of Xinjiang Uygur Autonomous Region, Kashi University, Kashi 844000, China.
School of Biology and Biological Engineering, South China University of Technology, Guangzhou Higher Education Mega Center, Panyu, Guangzhou 510006, People's Republic of China; Guangdong Provincial Engineering and Technology Research Center of Biopharmaceuticals, South China University of Technology, Guangzhou Higher Education Mega Center, Panyu, Guangzhou 510006, People's Republic of China; College of Life and Geographic Sciences, Kashi University, Kashi 844000, China; Key Laboratory of Biological Resources and Ecology of Pamirs Plateau in Xinjiang Uygur Autonomous Region, Key Laboratory of Ecology and Biological Resources in Yarkand Oasis at Colleges & Universities under the Department of Education of Xinjiang Uygur Autonomous Region, Kashi University, Kashi 844000, China.

Pretreatment process plays a key role in biofuel production from lignocellulosic feedstocks. A study on dilute NaOH pretreatment supplemented with HO under mild condition was conducted to overcome the recalcitrance of grass waste (GW). The optimized process could selectively increase lignin removal (73.2%), resulting in high overall recovery of holocellulose (73.8%) as well as high enzymolysis efficiency (83.5%) compared to HO or NaOH pretreatment. The analyses by Scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) revealed that supplementary HO disrupted the structure of GW to facilitate the removal of lignin by NaOH, and exhibited synergistic effect on lignin removal and enzymolysis with dilute NaOH. Moreover, high titer of ethanol (100.7 g/L) was achieved by SSCF on 30% (w/v) pretreated GW loading. The present study suggests that the established synergistic pretreatment is a simple, efficient, and promising process for GW biorefinery.

中文翻译：

双氧水协同稀碱预处理提高草废弃物木质素去除和酶解效率

预处理过程在木质纤维素原料生产生物燃料中发挥着关键作用。为了克服草料废弃物（GW）的顽固性，进行了在温和条件下添加 H2O 的稀 NaOH 预处理研究。与 H2O 或 NaOH 预处理相比，优化的工艺可以选择性地提高木质素去除率 (73.2%)，从而提高全纤维素的总体回收率 (73.8%) 以及高酶解效率 (83.5%)。扫描电子显微镜（SEM）、X射线衍射（XRD）和傅里叶变换红外光谱（FT-IR）分析表明，补充H2O破坏了GW的结构，有利于NaOH去除木质素，并对木质素表现出协同作用。用稀 NaOH 去除木质素和酶解。此外，SSCF 在 30% (w/v) 预处理的 GW 负载上实现了高滴度乙醇 (100.7 g/L)。本研究表明，所建立的协同预处理对于 GW 生物精炼来说是一种简单、高效且有前景的工艺。

更新日期：2020-01-09

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