Hydrogen Peroxide-Assisted Sodium Carbonate Pretreatment for the Enhancement of Enzymatic Saccharification of Corn Stover
2015
Gong, Wenbo | Liu, Chao | Mu, Xindong | Du, Haishun | Lv, Dong | Li, Bin | Han, Sheng
In this work, the effectiveness of hydrogen peroxide-assisted sodium carbonate (HSC) pretreatment of corn stover to produce fermentable sugars was investigated. It was found that the addition of H₂O₂ (a green oxidative agent) in Na₂CO₃ pretreatment could enhance the lignin removal and increase the hydrophilicity of the residual lignin, leading to the improved enzymatic digestibility and the yield of fermentable sugars. Also, results showed that lignin removal (in the range of 12–65%) was positively and linearly correlated with final total sugar yields. Post PFI refining could further improve the enzyme accessibility by increasing porosity of substrates. After HSC pretreatment (40 wt % Na₂CO₃ and 15 wt % H₂O₂, 120 °C for 60 min) and enzymatic hydrolysis, the final total sugar yield could achieve 79%, which was about 10% higher in comparison with the conventional Na₂CO₃ pretreatment under the same conditions. HSC pretreatment will have less environmental impact and less barriers for large scale production.
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