Dr. S.S. Bhatnagar University Institute of Chemical Engineering & Technology, Panjab University, Chandigarh, 160014, India.
Dr. S.S. Bhatnagar University Institute of Chemical Engineering & Technology, Panjab University, Chandigarh, 160014, India.
Int J Biol Macromol. 2018 Feb;107(Pt A):1294-1301. doi: 10.1016/j.ijbiomac.2017.09.107. Epub 2017 Sep 28.
Cellulose nanofibrils and lignin were simultaneously isolated from waste jute bags using soda cooking pretreatment method. Soda cooking resulted in reduction of recalcitrance of lignocellulose biomass leading to hydrolysis of hemicellulose into sugars, which was subsequently washed, leaving a residue of cellulose and lignin.The chemical composition, yield of lignin and cellulose were assessed using TAPPI method and ASTM standards, respectively. Yields of lignin and cellulose were 58 and 45%, respectively, calculated separately on the basis of their content in the jute bags. FTIR results confirmed the removal of lignin and hemicellulose from raw jute fibers during soda cooking process. NMR results depicted the aromatic structure of lignin which was further confirmed by UV results which clearly indicated the presence of phenolic compounds. The thermal stability of cellulose nanofibrils and lignin was higher than raw jute fibers. SEM showed cylindrical cellulose nanofibrils and agglomerates of amorphous and crystalline region of lignin. Size of jute fibers decreased to 12-18nm whereas the crystallinity increased after chemical and mechanical treatments studied using TEM and XRD, respectively. The study confirmed the isolation of cellulose nanofibrils and lignin extraction discarding the hemicellulose using single pot treatment.
采用苏打蒸煮预处理法从废麻袋中同时分离出纤维素纳米纤维和木质素。苏打蒸煮导致木质纤维素生物质的抗降解性降低，从而将半纤维素水解成糖，随后将其洗涤，留下纤维素和木质素的残留物。采用 TAPPI 法和 ASTM 标准分别评估了木质素和纤维素的化学成分和产率。根据麻袋中的含量，单独计算木质素和纤维素的产率分别为 58%和 45%。FTIR 结果证实了在苏打蒸煮过程中木质素和半纤维素从原麻纤维中被去除。NMR 结果描述了木质素的芳构化结构，这进一步通过 UV 结果得到证实，UV 结果清楚地表明存在酚类化合物。纤维素纳米纤维和木质素的热稳定性高于原麻纤维。SEM 显示出圆柱形的纤维素纳米纤维和木质素无定形和结晶区的团聚体。在用 TEM 和 XRD 分别研究化学和机械处理后，麻纤维的尺寸减小到 12-18nm，而结晶度增加。该研究证实了使用单锅处理从废麻袋中分离出纤维素纳米纤维和木质素并去除半纤维素。
