Preparation of cellulose nanocrystals from Humulus japonicus stem and the influence of high temperature pretreatment.
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.
College of Animal Science and Technology, Yangzhou University, No. 48 East Wenhui Road, China.
Yani
Y
Jiang
College of Mechanical Engineering, Yangzhou University, No. 196 West Huayang Road, China. Electronic address: jpzhou@yzu.edu.cn.
Jiping
J
Zhou
College of Mechanical Engineering, Yangzhou University, No. 196 West Huayang Road, China.
Qi
Q
Zhang
College of Animal Science and Technology, Yangzhou University, No. 48 East Wenhui Road, China.
Guoqi
G
Zhao
College of Mechanical Engineering, Yangzhou University, No. 196 West Huayang Road, China.
Lin
L
Heng
College of Mechanical Engineering, Yangzhou University, No. 196 West Huayang Road, China.
Dongdong
D
Chen
College of Mechanical Engineering, Yangzhou University, No. 196 West Huayang Road, China.
Dongfang
D
Liu
D002482:Cellulose / Q000737:chemistry*; D006358:Hot Temperature; D027582:Humulus / Q000737:chemistry*; D006868:Hydrolysis; D053758:Nanoparticles / Q000737:chemistry*; D018547:Plant Stems / Q000737:chemistry
D002482:Cellulose
Cellulose nanocrystals(CNCs); High temperature (HT) pretreatment; Humulus japonicus stem(HJS); Wild herb