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BioEnergy Research

, Volume 11, Issue 2, pp 456–465 | Cite as

Effect of Urea on the Enzymatic Hydrolysis of Lignocellulosic Substrate and Its Mechanism

  • Hongming Lou
  • Meilu Lin
  • Meijun Zeng
  • Cheng Cai
  • Yuxia Pang
  • Dongjie Yang
  • Xueqing Qiu
Article
  • 145 Downloads

Abstract

Effect of hydrogen bond breaker (urea) addition on the enzymatic hydrolysis of Avicel and eucalyptus pretreated by dilute acid (Eu-DA) was investigated. Urea enhanced the enzymatic hydrolysis of Eu-DA at 50 or 30 °C when the concentration of urea was below 60 g/L, while it inhibited the hydrolysis of Avicel. Low concentration urea (< 240 g/L) had little effect on the cellulase spatial structure and its activity. But it decreased cellulase binding to cellulose surface to inhibit the cellulose hydrolysis. Meanwhile, urea obviously prevented the adsorption of cellobiohydrolase I (CBHI) on the lignin in spite of little effect on the adsorption of β-glucosidase (BGL) and two endoglucanases (EGIII and EGV) on lignin. It was proposed that urea enhanced the enzymatic efficiency of Eu-DA by decreasing the cellulase adsorption on lignin surface.

Keywords

Lignocellulose Urea Enzymatic hydrolysis Cellulase adsorption 

Notes

Funding Information

The authors acknowledge the financial supports of the National Natural Science Foundation of China (21676109, 21376100), Science and Technology Program of Guangzhou (201707020025), and Guangdong Special Support Plan (2016TX03Z298).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Hongming Lou
    • 1
    • 2
  • Meilu Lin
    • 1
  • Meijun Zeng
    • 1
  • Cheng Cai
    • 1
  • Yuxia Pang
    • 1
  • Dongjie Yang
    • 1
  • Xueqing Qiu
    • 1
    • 2
  1. 1.School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhouChina
  2. 2.State Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhouChina

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