Department of Biochemistry and Biotechnology, CCE, State University of Londrina, Londrina, Brazil.
J Sci Food Agric. 2021 Apr;101(6):2362-2370. doi: 10.1002/jsfa.10859. Epub 2020 Oct 19.
Orange bagasse (OB) is an agroindustrial residue of great economic importance that has been little explored for the extraction of cellulose. The present study aimed to investigate different combinations of chemical (sodium hydroxide, peracetic acid and alkaline peroxide) and physical (autoclaving and ultrasonication) treatments performed in one-step processes for cellulose extraction from OB and to characterize the materials obtained according to their composition, morphology, crystallinity and thermal stability.
The processing yields ranged from 140 to 820 g kg , with a recovery of 720-1000 g kg of the original cellulose. Treatments promoted morphological changes in the fiber structure, resulting in materials with higher porosity, indicating partial removal of the noncellulosic fractions. The use of combined chemical treatments (NaOH and peracetic acid) with autoclaving was more efficient for obtaining samples with the highest cellulose contents.
Therefore, AC (processed by autoclaving with NaOH) was the most effective one-step treatment, resulting in 71.1% cellulose, 0% hemicellulose and 19.0% lignin, with a crystallinity index of 42%. The one-step treatments were able to obtain materials with higher cellulose contents and yields, reducing reaction times and the quantity of chemical reagents employed in the overall processes compared to multistep conventional processes. © 2020 Society of Chemical Industry.
橙蔗渣（OB）是一种具有重要经济意义的农业工业废料，但其纤维素提取方法研究甚少。本研究旨在探索化学（氢氧化钠、过氧乙酸和碱性过氧化物）和物理（高压灭菌和超声）处理的不同组合，在一步法中从 OB 中提取纤维素，并根据其组成、形态、结晶度和热稳定性对所得材料进行表征。
加工产率为 140 至 820g/kg，原始纤维素的回收率为 720-1000g/kg。处理促进了纤维结构的形态变化，导致材料具有更高的孔隙率，表明非纤维素部分的部分去除。使用组合化学处理（NaOH 和过氧乙酸）与高压灭菌的方法对于获得纤维素含量最高的样品更为有效。
因此，AC（用 NaOH 高压灭菌处理）是最有效的一步处理方法，得到 71.1%的纤维素、0%的半纤维素和 19.0%的木质素，结晶度指数为 42%。与多步常规工艺相比，一步处理能够获得纤维素含量和产率更高的材料，同时减少了反应时间和整体过程中使用的化学试剂的数量。© 2020 英国化学学会。
