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. 2019 Dec;293:122036.
doi: 10.1016/j.biortech.2019.122036. Epub 2019 Aug 20.

Heteropoly Acids Enhanced Neutral Deep Eutectic Solvent Pretreatment for Enzymatic Hydrolysis and Ethanol Fermentation of Miscanthus X Giganteus Under Mild Conditions

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Heteropoly Acids Enhanced Neutral Deep Eutectic Solvent Pretreatment for Enzymatic Hydrolysis and Ethanol Fermentation of Miscanthus X Giganteus Under Mild Conditions

Zongwei Guo et al. Bioresour Technol. .

Abstract

To improve the neutral DES (choline chloride/glycerol) pretreatment performance, three environmentally friendly heteropoly acids (phosphotungstic, phosphomolybdic and silicotungstic acids) were used as catalysts. Pretreatment with silicotungstic acid at 120 °C for 3 h resulted in 97.3% of enzymatic digestibility at an enzyme loading of 15FPU/g substrate, which was approximately eight times more than that of raw samples. More importantly, 80% of glucose yield was obtained within 12 h. Simultaneously, 81.8% of ethanol yield was achieved in the SSSF process. The efficient conversion was ascribed to the significant delignification (89.5%), which resulted in the exposure of more accessible specific surface area. This was attributed to that the proton (H+) from heteropoly acids could significantly contribute to the lignin degradation. Intriguingly, trace acetic acid (0.39 g/L) and HMF (0.21-0.95 g/L) in the pretreatment liquor were produced without any significant deleterious effects. These discoveries provide new insights for efficient biomass conversion under mild conditions.

Keywords: Enzymatic hydrolysis; Heteropoly acids; Miscanthus x giganteus; Neutral DES; Semi-simultaneous saccharification and fermentation.

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