Sustainable Packaging and Bioproducts Research (SPBR), School of Food Science and Environmental Health, Faculty of Sciences and Health, Technological University Dublin-City Campus, Central Quad, Grangegorman, Dublin, Ireland; Sustainability and Health Research Hub (SHRH), Technological University Dublin-City Campus, Grangegorman, Dublin, Ireland.
Teagasc Food Research Centre, Ashtown, Dublin, Ireland.
Ultrason Sonochem. 2024 Nov;110:107048. doi: 10.1016/j.ultsonch.2024.107048. Epub 2024 Aug 30.
The present study aims at investigating the application of ultrasound assisted choline chloride (ChCl) - formic acid (FA) deep eutectic solvent (DES) pretreatment of Barley straw. In addition, the efficiency of a wet grinding followed by high intensity ultrasound (HIUS) treatment for production of cellulose nanofibers (CNF) has been evaluated. The DES (using ChCl: FA at 1:9 M ratio) treatment at 45 kHz ultrasound frequency and 3 h of treatment duration resulted in 84.68 ± 1.02 % and 82.96 ± 0.79 % of lignin and hemicellulose solubilisation, respectively. The purification of DES treated solid residue resulted in cellulose with more than 90 % purity. Further, 10 min of wet grinding followed by 40 min of HIUS treatment resulted in more than 80 % nano-fibrillation efficiency. The produced CNF had diameters less than 100 nm in number size distribution and type I cellulose structure. This study confirmed that the developed process offers a sustainable method for producing nanocellulose from agricultural waste.
本研究旨在探索超声辅助氯化胆碱（ChCl）-甲酸（FA）深共晶溶剂（DES）预处理大麦秸秆的应用。此外，还评估了湿法研磨后高强度超声（HIUS）处理生产纤维素纳米纤维（CNF）的效率。在 45 kHz 超声频率和 3 小时处理时间下，DES（ChCl: FA 摩尔比为 1:9）处理分别导致木质素和半纤维素的溶解率达到 84.68±1.02%和 82.96±0.79%。DES 处理后的固体残渣经纯化后得到纤维素纯度超过 90%。进一步地，经过 10 分钟的湿法研磨和 40 分钟的 HIUS 处理，纳米纤维化效率超过 80%。所制备的 CNF 在数量尺寸分布和 I 型纤维素结构中直径小于 100nm。本研究证实，所开发的工艺为从农业废弃物生产纳米纤维素提供了一种可持续的方法。
