Orange bagasse (OB) is an abundant lignocellulosic residue in Brazil, and few studies have explored this raw material for cellulose and nanocellulose obtainment. The objective of this study was to obtain cellulose-based materials from OB through three one-step alkaline extraction processes using NaOH (chemical (CH), autoclaving (AC), and ultrasonication (US)). The obtained samples were characterized according to their composition, morphology, crystallinity, thermal stability, water and oil absorption capacity, solubility, and swelling capacity. Nanocellulose was also produced and characterized according to its composition, morphology (atomic-force microscopy), and crystallinity. The cellulose content of materials obtained from OB ranged from 33.7 to 85.4%, with a cellulose recovery of 65.3 to 100%. The combination of alkaline and autoclaving treatments was more efficient in obtaining a material with higher cellulose content, higher crystallinity, and thermal stability. Alkaline treatment combined with ultrasonication was less effective in obtaining a material with higher cellulose contents. Crystallinity and surface morphology of samples affected their functional properties. An increase in crystallinity of samples led to a decrease in water and oil holding capacities, swelling in water, and solubility, while an increase in porosity resulted in higher water and oil holding capacities, swelling in water, and solubility. The nanocellulose obtained had 60% crystallinity with a yield of 4.4% (each 100 g of raw OB subjected to the sequential treatments yielded 4.4 g of nanocellulose). Cellulose-based materials obtained in this study can be used as fibers source in food products, as substrates in fermentation processes, and it can also be used to obtain nanocellulose as performed in this study.

橙色甘蔗渣（OB）在巴西是一种丰富的木质纤维素残留物，很少有研究探索这种原料用于纤维素和纳米纤维素的生产。这项研究的目的是通过使用NaOH（化学（CH），高压灭菌（AC）和超声（US））的三个一步碱性提取工艺从OB中获得纤维素基材料。根据其组成，形态，结晶度，热稳定性，吸水和吸油能力，溶解度和溶胀能力对所得样品进行表征。纳米纤维素也根据其组成，形态（原子力显微镜）和结晶度进行生产和表征。由OB获得的材料的纤维素含量为33.7％至85.4％，纤维素回收率为65.3％至100％。碱和高压灭菌处理的组合在获得具有更高纤维素含量，更高结晶度和热稳定性的材料方面更有效。碱处理与超声处理相结合对于获得具有较高纤维素含量的材料不太有效。样品的结晶度和表面形态会影响其功能特性。样品结晶度的增加导致水和油的保持能力，水的溶胀和溶解度降低，而孔隙率的增加导致水和油的保持能力，水的溶胀和溶解度更高。所获得的纳米纤维素具有60％的结晶度，产率为4.4％（每100g经过连续处理的未加工的OB产生4.4g的纳米纤维素）。