Abstract In the last years, Chile has increased the production of blueberries; consequently, a large number of lignocellulosic residues derived from the harvesting and pruning are being generated. These residues are commonly burned, therefore increasing CO2 emissions. This study focuses on the extraction of two added-value products from blueberry pruning residues (BPRs), cellulose nanocrystals (CNC-IL) isolated using ionic liquid (IL) 1-ethyl-3-methylimidazolium [emim][Cl], and carboxylated nanocellulose (TOCNC), isolated with (2,2,6,6-tetramethylpiperidine-1-yl) oxyl or TEMPO reagent combined with a mechanical disintegration process. These products were characterized by zeta potential (ζ), FTIR, XRD, TGA, AFM, and conductometric titration. Results show oval-shaped CNC-IL particles with lengths of 46.1 ± 9.3 nm; meanwhile, TOCNC were rod-like shaped particles, with lengths of 120.3 ± 30.6 nm. These BPRs showed a promising potential to produce cellulose nanocrystals (CNCs) with different surface properties, opening a new alternative for the production of cellulose nanomaterials (CNMs) with promising applications in colloidal formulations, coatings, among others. Graphical Abstract

中文翻译：

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离子液体和TEMPO-氧化结合机械分解从蓝莓修剪残留物中分离的纤维素纳米晶体

摘要 近年来，智利增加了蓝莓的产量；因此，正在产生大量源自收获和修剪的木质纤维素残留物。这些残留物通常会被燃烧，因此会增加二氧化碳排放量。本研究的重点是从蓝莓修剪残留物 (BPR)、使用离子液体 (IL) 1-乙基-3-甲基咪唑鎓 [emim][Cl] 分离的纤维素纳米晶体 (CNC-IL) 和羧化纳米纤维素 (TOCNC)，用（2,2,6,6-四甲基哌啶-1-基）氧基或 TEMPO 试剂与机械分解过程相结合。这些产品通过 zeta 电位 (ζ)、FTIR、XRD、TGA、AFM 和电导滴定进行表征。结果显示椭圆形 CNC-IL 颗粒长度为 46.1 ± 9.3 nm；同时，TOCNC 是棒状颗粒，长度为 120.3 ± 30.6 nm。这些 BPR 显示出生产具有不同表面特性的纤维素纳米晶体 (CNC) 的潜力，为纤维素纳米材料 (CNM) 的生产开辟了新的替代方案，在胶体配方、涂料等方面具有广阔的应用前景。图形概要