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Modification of lignin by various additives to mitigate lignin inhibition for improved enzymatic digestibility of dilute acid pretreated hardwood

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  • Chu, Qiulu
  • Tong, Wenyao
  • Wu, Shufang
  • Jin, Yongcan
  • Hu, Jinguang
  • Song, Kai

Abstract

During acidic pretreatment of renewable lignocellulosic biomass, lignin depolymerization/repolymerization reactions often occur, which intensifies lignin inhibition on cellulose hydrolysis generally through lignin-derived inhibitors formation, unproductive binding and physical blockage effect. In order to improve the enzymatic digestibility of dilute acid pretreated hardwood, in this work various additives were compared and their inhibition mitigating effects were examined. It was revealed that 2-naphthol addition reduced the formation of inhibitory derivatives from lignin, thus increasing the enzymatic hydrolysis yield of the whole slurry after dilute acid pretreatment. The addition of phenolic acids largely diminished enzyme binding effect of the insoluble lignin. Moreover, the 2-naphthol-7-sulfonate additive led to the most pronounced mitigation on physical blockage effect of lignin, as XPS and SEM results showed the significant removal of surface lignin. This work revealed the different mechanisms of various additives in mitigating lignin inhibition, and provided a better understanding on utilizing proper additives to improve biomass saccharification for biorefinery applications.

Suggested Citation

  • Chu, Qiulu & Tong, Wenyao & Wu, Shufang & Jin, Yongcan & Hu, Jinguang & Song, Kai, 2021. "Modification of lignin by various additives to mitigate lignin inhibition for improved enzymatic digestibility of dilute acid pretreated hardwood," Renewable Energy, Elsevier, vol. 177(C), pages 992-1000.
    • Handle: RePEc:eee:renene:v:177:y:2021:i:c:p:992-1000
    DOI: 10.1016/j.renene.2021.06.048
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    References listed on IDEAS

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    1. Li, Xiang & Li, Mi & Pu, Yunqiao & Ragauskas, Arthur J. & Klett, Adam S. & Thies, Mark & Zheng, Yi, 2018. "Inhibitory effects of lignin on enzymatic hydrolysis: The role of lignin chemistry and molecular weight," Renewable Energy, Elsevier, vol. 123(C), pages 664-674.
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    3. Saini, Jitendra Kumar & Patel, Anil Kumar & Adsul, Mukund & Singhania, Reeta Rani, 2016. "Cellulase adsorption on lignin: A roadblock for economic hydrolysis of biomass," Renewable Energy, Elsevier, vol. 98(C), pages 29-42.
    4. Pin, Thaynara C. & Nascimento, Viviane M. & Costa, Aline C. & Pu, Yunqiao & Ragauskas, Arthur J. & Rabelo, Sarita C., 2020. "Structural characterization of sugarcane lignins extracted from different protic ionic liquid pretreatments," Renewable Energy, Elsevier, vol. 161(C), pages 579-592.
    5. Alam, Aftab & Wang, Youmei & Liu, Fei & Kang, Heng & Tang, Shang-wen & Wang, Yanting & Cai, Qiuming & Wang, Hailang & Peng, Hao & Li, Qian & Zeng, Yajun & Tu, Yuanyuan & Xia, Tao & Peng, Liangcai, 2020. "Modeling of optimal green liquor pretreatment for enhanced biomass saccharification and delignification by distinct alteration of wall polymer features and biomass porosity in Miscanthus," Renewable Energy, Elsevier, vol. 159(C), pages 1128-1138.
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    Cited by:

    1. Wang, Peng & Su, Yan & Tang, Wei & Huang, Caoxing & Lai, Chenhuan & Ling, Zhe & Yong, Qiang, 2022. "Revealing enzymatic digestibility of kraft pretreated larch based on a comprehensive analysis of substrate-related factors," Renewable Energy, Elsevier, vol. 199(C), pages 1461-1468.
    2. Tong, Wenyao & Chu, Qiulu & Li, Jin & Xie, Xinyu & Wang, Jing & Jin, Yongcan & Wu, Shufang & Hu, Jinguang & Song, Kai, 2022. "Insight into understanding sequential two-stage pretreatment on modifying lignin physiochemical properties and improving holistic utilization of renewable lignocellulose biomass," Renewable Energy, Elsevier, vol. 187(C), pages 123-134.
    3. Wang, Kai & Yang, Chundong & Xu, Xin & Lai, Chenhuan & Zhang, Daihui & Yong, Qiang, 2022. "2-Naphthol modification alleviated the inhibition of ethanol organosolv lignin on enzymatic hydrolysis," Renewable Energy, Elsevier, vol. 200(C), pages 767-776.

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