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Subcritical CO2-assisted autohydrolysis for the co-production of oligosaccharides and fermentable sugar from corn straw

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Abstract

Subcritical CO2-assisted autohydrolysis pretreatment for oligosaccharides and fermentable sugars production from corn straw was investigated. The result showed that the prehydrolysate was rich in xylose, and among the xylose, about 90.2% existed in the form of xylo-oligosaccharides (XOS), as well as the functional XOS (DP < 5) took up about 40%. Few inhibitors were formed during the pretreatment and there was almost no effect on subsequent fermentation. Additionally, the highest glucose yield was 90.6% (32.8 g/100 g corn straw) in enzyme hydrolysate and 89.4% (21.2 g/100 g corn straw) of lignin was recovered in the enzymatic hydrolysis residue. The proposed pretreatment method was an effective way to improve corn straw enzymatic hydrolysis with little lignin degradation. Furthermore, the characterization data were also obtained through the analysis of optimally pretreated solids (pretreatment conditions: 170 °C, 5 Mpa CO2 and 40 min residence time) by using HSQC, XRD, FTIR, SEM and TG, which revealed that the XOS was mainly (1 → 4)-β-D-xylan and hemicellulose removal affected subsequent enzymatic hydrolysis dramatically. This study provided an environmentally friendly and economical approach for the co-production of oligosaccharides and fermentable sugars from corn straw that can both be further converted into biomass energy.

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Acknowledgments

The authors greatly acknowledge the support of the National Key R&D Program China (No. 2017YFB0307901) and the Science and Technology Project of Guangzhou City (No. 201607020025)

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Authors and Affiliations

  1. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, People’s Republic of China

    Xiao Liu, Weiqi Wei & Shubin Wu

  2. Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, 210037, People’s Republic of China

    Weiqi Wei

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  1. Xiao Liu
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  2. Weiqi Wei
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Correspondence to Shubin Wu.

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Liu, X., Wei, W. & Wu, S. Subcritical CO2-assisted autohydrolysis for the co-production of oligosaccharides and fermentable sugar from corn straw. Cellulose 26, 7889–7903 (2019). https://doi.org/10.1007/s10570-019-02626-3

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