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Integrating Benzenesulfonic Acid Pretreatment and Bio-Based Lignin-Shielding Agent for Robust Enzymatic Conversion of Cellulose in Bamboo

1
College of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China
2
Jiangsu Provincial Key Laboratory of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China
3
Department of Civil and Environmental Engineering, Brunel University London, Kingston Lane, Uxbridge UB8 3PH, UK
*
Authors to whom correspondence should be addressed.
Polymers 2020, 12(1), 191; https://doi.org/10.3390/polym12010191
Received: 26 November 2019 / Revised: 7 January 2020 / Accepted: 8 January 2020 / Published: 10 January 2020
(This article belongs to the Section Polymer Processing and Performance)
A hydrotrope-based pretreatment, benzenesulfonic acid (BA) pretreatment, was used to fractionate bamboo in this work. With optimized content (80 wt %) of BA in pretreatment liquor, about 90% of lignin and hemicellulose could be removed from bamboo under mild conditions (95 °C, 30 min or 80 °C, 60 min). The potential accessibility of BA pretreated substrate to cellulase was thus significantly improved and was also found to be much higher than those of acidic ethanol and dilute acid pretreatments. But the deposition of lignin on the surface of solid substrates, especially the BA pretreated substrate, was also observed, which showed a negative effect on the enzymatic hydrolysis efficiency. The addition of inexpensive soy protein, a bio-based lignin-shielding agent, could readily overcome this negative effect, leading the increase of enzymatic conversion of cellulose in BA pretreated substrate from 37% to 92% at a low cellulase loading of 4 FPU/g glucan. As compared to acidic ethanol and dilute acid pretreatments, the combination of BA pretreatment and soy protein could not only stably improve the efficiency of non-cellulose components removal, but also could significantly reduce the loading of cellulase.
Keywords: benzenesulfonic acid pretreatment; components removal; lignin deposition; enzymatic hydrolysis; lignin-shielding agent benzenesulfonic acid pretreatment; components removal; lignin deposition; enzymatic hydrolysis; lignin-shielding agent
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MDPI and ACS Style

Luo, X.; Gong, Z.; Shi, J.; Chen, L.; Zhu, W.; Zhou, Y.; Huang, L.; Liu, J. Integrating Benzenesulfonic Acid Pretreatment and Bio-Based Lignin-Shielding Agent for Robust Enzymatic Conversion of Cellulose in Bamboo. Polymers 2020, 12, 191.

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