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Enhancing the biorefinery of chestnut burrs. Part I. Study of the pretreatment with choline chloride urea diluted deep eutectic solvent
Biomass & Bioenergy ( IF 6 ) Pub Date : 2023-04-19 , DOI: 10.1016/j.biombioe.2023.106786
Iván Costa-Trigo, Alicia Paz, María Guadalupe Morán-Aguilar, Nelson Pérez Guerra, Ricardo Pinheiro de Souza Oliveira, José Manuel Domínguez

Chestnut burrs (CB) are agro-industrial wastes produced in large amounts during chestnut processing. Despite their high value composition, this type of biomass has been scarcely studied, becoming an important material to be valorized. In this work, a green technology based on the use of diluted choline chloride urea (ChCl:U) deep eutectic solvent (DES) was postulated to deconstruct the lignocellulosic structure. The pretreatment was evaluated using untreated CB and CB previously processed (washed CB or the solid residue obtained after prehydrolysis). Following a biorefinery concept, the samples obtained in this work will be further enzymatically hydrolyzed in Part II to reach fermentable sugars-containing solutions. Several operational parameters such as time (4, 8 and 16 h), temperature (60, 80, 100 and 120 °C), and liquid-solid ratio (LSR) (10:1, 15:1 and 20:1) were studied to improve CB deconstruction. Physicochemical transformations were investigated by ATR-FTIR and SEM analysis. The best delignification rate (∼40%) was achieved applying the DES pretreatment in untreated CB at 100 °C for 16 h and 20:1 (w/w) LSR, being corroborated by physicochemical changes observed by FTIR and SEM.



中文翻译:

加强板栗毛刺的生物精炼。第一部分 氯化胆碱尿素稀释低共熔溶剂预处理的研究

栗子毛刺 (CB) 是栗子加工过程中大量产生的农业工业废料。尽管它们具有高价值成分,但这种类型的生物质几乎没有被研究过,成为一种重要的有价值的材料。在这项工作中,假设了一种基于使用稀释的氯化胆碱尿素 (ChCl:U) 低共熔溶剂 (DES) 的绿色技术来解构木质纤维素结构。使用未处理的 CB 和先前处理过的 CB(洗涤过的 CB 或预水解后获得的固体残留物)评估预处理。按照生物精炼厂的概念,在这项工作中获得的样品将在第二部分中进一步酶水解,以获得可发酵的含糖溶液。几个操作参数,例如时间(4、8 和 16 小时)、温度(60、80、100 和 120 °C)和液固比 (LSR)(10:1,15:1 和 20:1) 被研究以改进 CB 解构。通过 ATR-FTIR 和 SEM 分析研究了物理化学转化。在 100°C 和 20:1 (w/w) LSR 条件下,在未处理的 CB 中进行 DES 预处理 16 小时,达到最佳脱木素率 (~40%),FTIR 和 SEM 观察到的物理化学变化证实了这一点。

更新日期:2023-04-19
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