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Differential reinforcement of enzymatic hydrolysis by adding chemicals and accessory proteins to high solid loading substrates with different pretreatments

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Abstract

High dosage of enzyme is required to achieve effective lignocellulose hydrolysis, especially at high-solid loadings, which is a significant barrier to large-scale bioconversion of lignocellulose. Here, we screened four chemical additives and three accessory proteins for their effects on the enzymatic hydrolysis of various lignocellulosic materials. The effects were found to be highly dependent on the composition and solid loadings of substrates. For xylan-extracted lignin-rich corncob residue, the enhancing effect of PEG 6000 was most pronounced and negligibly affected by solid content, which reduced more than half of enzyme demand at 20% dry matter (DM). Lytic polysaccharide monooxygenase enhanced the hydrolysis of ammonium sulfite wheat straw pulp, and its addition reduced about half of protein demand at the solid loading of 20% DM. Supplementation of the additives in the hydrolysis of pure cellulose and complex lignocellulosic materials revealed that their effects are tightly linked to pretreatment strategies.

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Acknowledgements

The study was supported by Heilongjiang Provincial Key Laboratory of Environmental Microbiology and Recycling of Argo-Waste in Cold Region, Heilongjiang Bayi Agricultural University, China (No. 201715).

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Authors and Affiliations

  1. State Key Laboratory of Microbial Technology, Shandong University, Jinan, 250100, China

    Jian Du, Xiu Zhang, Jian Zhao, Guodong Liu & Yinbo Qu

  2. School of Life Science, Qufu Normal University, Qufu, 273165, China

    Wenxia Song

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  1. Jian Du
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  3. Xiu Zhang
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Correspondence to Yinbo Qu.

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Du, J., Song, W., Zhang, X. et al. Differential reinforcement of enzymatic hydrolysis by adding chemicals and accessory proteins to high solid loading substrates with different pretreatments. Bioprocess Biosyst Eng 41, 1153–1163 (2018). https://doi.org/10.1007/s00449-018-1944-x

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  • DOI: https://doi.org/10.1007/s00449-018-1944-x

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