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首页> 外文期刊>Biotechnology Progress >Liberation of fermentable sugars from soybean hull biomass using ionic liquid 1-butyl-3-methylimidazolium acetate and their bioconversion to ethanol
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Liberation of fermentable sugars from soybean hull biomass using ionic liquid 1-butyl-3-methylimidazolium acetate and their bioconversion to ethanol

机译：使用离子液体乙酸1-丁基-3-甲基咪唑鎓盐从大豆壳生物质中分离可发酵糖并将其生物转化为乙醇

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摘要

Optimized hydrolysis of lignocellulosic waste biomass is essential to achieve the liberation of sugars to be used in fermentation process. Ionic liquids (ILs), a new class of solvents, have been tested in the pretreatment of cellulosic materials to improve the subsequent enzymatic hydrolysis of the biomass. Optimized application of ILs on biomass is important to advance the use of this technology. In this research, we investigated the effects of using 1-butyl-3-methylimidazolium acetate ([bmim][Ac]) on the decomposition of soybean hull, an abundant cellulosic industrial waste. Reaction aspects of temperature, incubation time, IL concentration, and solid load were optimized before carrying out the enzymatic hydrolysis of this residue to liberate fermentable glucose. Optimal conditions were found to be 75 degrees C, 165 min incubation time, 57% (mass fraction) of [bmim][Ac], and 12.5% solid loading. Pretreated soybean hull lost its crystallinity, which eased enzymatic hydrolysis, confirmed by Fourier Transform Infrared analysis. The enzymatic hydrolysis of the biomass using an enzyme complex from Penicillium echinulatum liberated 92% of glucose from the cellulose matrix. The hydrolysate was free of any toxic compounds, such as hydroxymethylfurfural and furfural. The obtained hydrolysate was tested for fermentation using Candida shehatae HM 52.2, which was able to convert glucose to ethanol at yields of 0.31. These results suggest the possible use of ILs for the pretreatment of some lignocellulosic waste materials, avoiding the formation of toxic compounds, to be used in second-generation ethanol production and other fermentation processes. (c) 2015 American Institute of Chemical Engineers Biotechnol. Prog., 32:312-320, 2016
机译：木质纤维素废料生物质的最佳水解对于实现发酵过程中所用糖的释放至关重要。离子液体（ILs）是一种新型溶剂，已在纤维素材料的预处理中进行了测试，以改善生物质的后续酶促水解。 IL在生物质上的优化应用对于促进该技术的使用非常重要。在这项研究中，我们研究了使用1-丁基-3-甲基咪唑乙酸盐（[bmim] [Ac]）对大量纤维素工业废料大豆皮分解的影响。在进行该残渣的酶促水解以释放出可发酵的葡萄糖之前，对温度，孵育时间，IL浓度和固体载量的反应方面进行了优化。发现最佳条件为75摄氏度，孵育时间165分钟，[bmim] [Ac]的57％（质量分数）和固体含量为12.5％。傅立叶变换红外分析证实，预处理过的大豆皮失去了结晶度，从而减轻了酶促水解作用。使用来自棘皮青霉的酶复合物的生物质的酶促水解从纤维素基质释放了92％的葡萄糖。水解产物不含任何有毒化合物，例如羟甲基糠醛和糠醛。使用假丝酵母假丝酵母HM 52.2测试所得的水解产物的发酵，该假丝酵母能够以0.31的产率将葡萄糖转化为乙醇。这些结果表明，IL可能用于预处理某些木质纤维素废料，避免形成有毒化合物，可用于第二代乙醇生产和其他发酵过程。 （c）2015美国化学工程师学会生物技术学会。 Prog。，32：312-320，2016

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