Enhancing the enzymatic digestibility of sugarcane bagasse through the application of an ionic liquid in combination with an acid catalyst
Enhancing the enzymatic digestibility of sugarcane bagasse through the application of an ionic liquid in combination with an acid catalyst
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DOI：
10.1002/btpr.711
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发表时间：
2012
影响因子：
2.9
通讯作者：
D. Diedericks;E. Rensburg;María del Prado García‐Aparicio;J. Görgens
中科院分区：
文献类型：
--
作者：
D. Diedericks;E. Rensburg;María del Prado García‐Aparicio;J. Görgens
各种离子液体已被确定为有效的预处理溶剂，其可以通过去除木质素来增强木质纤维素的纤维素消化率，木质素是导致木质纤维素的难消化性质的主要因素之一。1-丁基-3-甲基咪唑甲基硫酸盐（[BMiM] MeSO 4）是一种很有潜力的脱木素试剂，因此研究了其作为甘蔗渣（SB）预处理溶剂的应用。该研究还评价了酸催化剂（即，H2SO 4）和预处理条件的影响，其分别在0-240 min和50-150°C的时间和温度范围内变化。酸催化剂的使用有助于更易消化的固体和更高程度的脱木质素。然而，[BMiM] MeSO 4-H2SO 4组合未能产生完全可消化的固体，因为在125°C持续120分钟的最佳预处理条件下获得了77%（w/w）的最大纤维素消化率。此外，在预处理期间可以提取高达一半的木质素含量，同时广泛地，有时完全地去除木聚糖，木聚糖的存在，也妨碍纤维素消化率。因此，[BMiM] MeSO 4已被确定为SB的有效预处理溶剂，因为其应用显著改善了消化率，并且同时去除了导致木质纤维素的难消化性质的两个主要因素。由于木聚糖和木质素具有作为前体化学品的潜在价值，现有工艺将来可能会扩展到底物分馏，这是一种生物精炼概念，其中所有原料成分都有价值。© 2011美国化学工程师学会生物技术。程序，2012
Various ionic liquids have been identified as effective pretreatment solvents that can enhance the cellulose digestibility of lignocellulose by removing lignin, one of the main factors contributing to the recalcitrant nature of lignocellulose. 1‐Butyl‐3‐methylimidazolium methylsulfate ([BMiM]MeSO4) is a potential delignification reagent, hence its application as a pretreatment solvent for sugarcane bagasse (SB) was investigated. The study also evaluated the benefit of an acid catalyst (i.e., H2SO4) and the effect of pretreatment conditions, which varied within a time and temperature range of 0–240 min and 50–150°C, respectively. The use of an acid catalyst contributed to a more digestible solid and a higher degree of delignification. However, the [BMiM]MeSO4‐H2SO4 combination failed to produce a fully digestible solid, as a maximum cellulose digestibility of 77% (w/w) was obtained at the optimum pretreatment condition of 125°C for 120 min. Furthermore, up to half of the lignin content could be extracted during pretreatment, while simultaneously extensive, sometimes complete, removal of xylan, the presence of which, also hampers cellulose digestibility. Hence, [BMiM]MeSO4 has been identified an effective pretreatment solvent for SB as the application thereof both significantly improved digestibility, and simultaneously removed two of the main factors contributing to the recalcitrant nature of lignocellulose. As xylan and lignin have potential value as precursor chemicals, the existing process may in future be extended toward substrate fractionation, a biorefinery concept where value is added to all feedstock constituents. © 2011 American Institute of Chemical Engineers Biotechnol. Prog., 2012