Centre for Sustainable Packaging and Bioproducts (CSPB), School of Food Science and Environmental Health, Technological University Dublin - City Campus, Central Quad, Grangegorman, Dublin, Ireland; Sustainability and Health Research Hub, Technological University Dublin - City Campus, Grangegorman, Dublin, Ireland.
Teagasc Food Research Centre, Ashtown, Dublin, Ireland.
Int J Biol Macromol. 2024 Nov;281(Pt 2):136213. doi: 10.1016/j.ijbiomac.2024.136213. Epub 2024 Oct 4.
This study investigates the production of cellulose nanofibers (CNF) from Barley straw using ultrasound-assisted deep eutectic solvent (US-DES) treatment for biomass fractionation and subsequent high-intensity ultrasonication (HIUS) for nano-fibrillation. Two deep eutectic solvents (DES), synthesized from choline chloride (ChCl) and oxalic acid dihydrate (OAD) at 1:1 and 2:1 M ratio, achieved solubilisation of over 80 % of lignin and hemicellulose under optimal conditions. The purification of these DES-treated materials resulted in cellulose with a purity >88 %. CNFs, characterized by a size of <100 nm, a polydispersity index under 0.5, and a zeta potential lower than -30 mV, were successfully isolated through a combination of wet grinding and HIUS treatment. SEM and XRD results showed the formation of a network of interconnected fibres with a Type I cellulose structure. This research highlights Barley straw's potential as a sustainable source of high-value CNF from agricultural waste.
本研究采用超声辅助深共熔溶剂（US-DES）处理对大麦秸秆进行生物质分级，然后进行高强度超声处理（HIUS），制备纤维素纳米纤维（CNF）。两种深共熔溶剂（DES）由氯化胆碱（ChCl）和草酸二水合物（OAD）以 1:1 和 2:1 M 的比例合成，在最佳条件下可实现 80%以上木质素和半纤维素的溶解。对这些 DES 处理材料进行纯化，可得到纯度>88%的纤维素。通过湿磨和 HIUS 处理相结合，成功分离出尺寸小于 100nm、多分散指数低于 0.5、zeta 电位低于-30mV 的 CNF。SEM 和 XRD 结果表明，形成了具有 I 型纤维素结构的相互连接纤维网络。这项研究强调了大麦秸秆作为农业废弃物中高价值 CNF 的可持续来源的潜力。
