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One-step lignocellulose fractionation using acid/pentanol pretreatment for enhanced fermentable sugar and reactive lignin production with efficient pentanol retrievability
Bioresource Technology ( IF 9.7 ) Pub Date : 2022-06-18 , DOI: 10.1016/j.biortech.2022.127503
Meysam Madadi 1 , Zahoor 2 , Guojie Song 1 , Keikhosro Karimi 3 , Daochen Zhu 2 , Mahdy Elsayed 4 , Fubao Sun 1 , Abdelfatah Abomohra 5
Affiliation  

To valorize whole lignocellulosic biomass, this study proposed a biphasic solvent system using dilute acid (DA)/pentanol pretreatment. Effects of the key factors, i.e., temperature and pentanol concentration, on aspen were evaluated. Under identified optimal pretreatment conditions (160 °C, 60% pentanol), 85% and 91% of lignin and hemicellulose were solubilized in separate organic and liquid phases, respectively, while 91.1% of cellulose was retained in solid fraction. Enzymatic digestibility efficiency of pretreated cellulose was ∼ 6.4-times higher than that of untreated biomass. Notably, excellent pentanol recovery rates were obtained after four-times recycling (84%) with great cellulose digestibility (81%) and delignification (71%) performance. The recovered lignin contained low levels of contaminated sugars (<1%), while it could stabilize and protect high amounts of β-O-4 bonds. Besides, high phenolic OH content was found in lignin, which could be utilized for lignin-based biomaterials. Therefore, DA/pentanol pretreatment is an innovative promising technology for lignocellulosic valorization towards biorefinery.

中文翻译:


使用酸/戊醇预处理进行一步式木质纤维素分馏,以提高可发酵糖和活性木质素的产量,并具有高效的戊醇回收能力



为了评估整个木质纤维素生物质的价值,本研究提出了一种使用稀酸(DA)/戊醇预处理的双相溶剂系统。评价了温度和戊醇浓度等关键因素对白杨的影响。在确定的最佳预处理条件(160℃,60%戊醇)下,85%和91%的木质素和半纤维素分别溶解在单独的有机相和液相中,而91.1%的纤维素保留在固体部分中。预处理的纤维素的酶消化效率比未处理的生物质高约 6.4 倍。值得注意的是,经过四次回收后,获得了优异的戊醇回收率(84%),并且具有良好的纤维素消化率(81%)和脱木质素(71%)性能。回收的木质素含有低含量的污染糖(%3C1%),同时它可以稳定和保护大量的β-O-4键。此外,木质素中酚羟基含量较高,可用于木质素基生物材料。因此,DA/戊醇预处理是一种创新的、有前景的木质纤维素生物精炼技术。
更新日期:2022-06-18
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