Preparation of cellulose nanocrystals from Humulus japonicus stem and the influence of high temperature pretreatment. (15th May 2017)

• Record Type: Journal Article
• Authors: Jiang, Yani; Zhou, Jiping; Zhang, Qi; Zhao, Guoqi; Heng, Lin; Chen, Dongdong; Liu, Dongfang
• Is Part Of: Carbohydrate polymers. Volume 164(2017)
• Page Start: 284
• Page End: 293
• Publication Date: 2017-05-15
• Subjects: Humulus japonicus stem(HJS) -- Wild herb -- Cellulose nanocrystals(CNCs) -- High temperature (HT) pretreatment; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2017.02.021
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Humulus japonicas stem was first used to prepare cellulose nanocrystals (CNCs) using acid hydrolysis. The influence of high temperature (HT) pretreatment was studied. The average diameters of those HT-CNCs were almost half of the CNCs. The average aspect ratio of HT140-CNCs was almost twice of CNCs. The crystallinities and thermal stabilities of those HT-CNCs were improved compared to CNCs. Abstract: As one of the most abundant wild herbs in nature, the Humulus japonicus stem (HJS) is a new low-cost source of cellulosic material. In this work, cellulose nanocrystals (CNCs) were isolated from HJS using acid hydrolysis. The influence of high temperature pretreatment (HT pretreatment) on the properties and yields of these HT-HJS (HJS fibers after HT pretreatment at different temperatures) and HT-CNCs (CNCs prepared from the HT-HJS) was studied. The results showed that there was no variation of the chemical structure among the HT-HJS and HT-CNCs. The thermal stabilities and crystallinities of the HT-HJS were higher than bleached HJS. The average diameters of the HT-CNCs were significantly smaller while the average aspect ratios of them were obviously bigger than the CNCs, and the biggest average aspect ratio of HT140-CNCs (63.40) was almost twice of CNCs (32.00). Compared with the CNCs (70.05%, 212.8 °C), the crystallinity and initial degradation temperature also showed increase for the HT-CNCs and increased up to maximum of 86.93% and 227.5 °C for the HT160-CNCs.