氧化镁-乙醇预处理提高玉米秸秆的脱木质素效率及其后续的酶解作用。
Enhancing delignification and subsequent enzymatic hydrolysis of corn stover by magnesium oxide-ethanol pretreatment.
机构信息
Department of Biological and Agricultural Engineering, Kansas State University, Manhattan, KS 66506, United States.
Department of Industrial and Manufacturing Systems Engineering, Kansas State University, Manhattan, KS 66506, United States.
出版信息
Bioresour Technol. 2019 May;279:124-131. doi: 10.1016/j.biortech.2019.01.123. Epub 2019 Jan 26.
Corn stover pretreatment by MgO-ethanol was investigated to improve sugar recovery by reducing sugar degradation and enhance enzymatic hydrolysis by improving delignification and reducing inhibitor formation. Results showed MgO as an effective additive and Lewis base, functioned to neutralize the acids released from hemicellulose during pretreatment, reduce monosaccharide degradation and inhibitor formation, and enhance delignification. The optimal pretreatment conditions were 50% ethanol, 0.08 mol/L MgO, and 10% solid loading at 190 °C for 40 min. Under optimal conditions, 98% glucose and 92% xylose were recovered with 89% glucan and 71% xylan recoveries and 60% lignin removal. A total sugar yield of 63% on a received biomass basis after enzymatic hydrolysis was obtained with 78% glucose and 41% xylose yields. The resulting biomass slurry was near-neutral and free of furfural and 5-hydroxymethylfurfural. Thus, the process to isolate high-purity value-added lignin and recover sugars from biomass liquor can be largely simplified.
采用 MgO-乙醇对玉米秸秆进行预处理，通过降低还原糖降解、提高脱木质素效率并减少抑制剂生成来提高糖得率。结果表明，MgO 作为一种有效的添加剂和路易斯碱，可中和预处理过程中半纤维素释放的酸，减少单糖降解和抑制剂生成，增强脱木质素作用。最佳预处理条件为：乙醇 50%、MgO 0.08 mol/L、固液比 10%、190°C 反应 40 min。在此条件下，葡萄糖和木糖的回收率分别为 98%和 92%，纤维素和木聚糖的得率分别为 89%和 71%，木质素去除率为 60%。酶解后按接收生物质计算的总糖收率为 63%，葡萄糖和木糖的得率分别为 78%和 41%。所得生物质浆液接近中性，不含糠醛和 5-羟甲基糠醛。因此，可大大简化从生物质液中分离高纯度附加值木质素和回收糖的工艺。
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