低共熔溶剂预处理制备豆渣纤维素纳米纤丝的研究

Preparation of Cellulose Nanofibril from Okara Using Deep Eutectic Solvents

关键词:  低共熔溶剂  预处理  豆渣  纤维素纳米纤丝

Key Words:deep eutectic solvents  pretreatment  okara  cellulose nanofibril

摘要:采用氯化胆碱-草酸、氨基磺酸-尿素、氯化胆碱-柠檬酸分别经混合加热法制备了3种低共熔溶剂（DES），探讨了不同低共熔溶剂对豆渣纤维素预处理效果的影响。结果表明，3种DES均能够提纯豆渣纤维素，其中氯化胆碱-草酸体系对豆渣提纯纤维素效果最好，综纤维素含量为95.81%，且得到的α-纤维素含量高达92.60%，经高压均质后得到豆渣纤维素纳米纤丝（CNF），其直径为27~30 nm。氯化胆碱-柠檬酸体系和氨基磺酸-尿素体系分别预处理的豆渣经高压均质制备得到的纤维直径在0.1~0.5 μm左右，未达到纳米级。

Abstract:Three kinds of deep eutectic solvents （DES） were prepared accordingly using choline chloride and oxalic acid （ChCl-O）， sulfamic acid and urea， choline chloride and citric acid by mixing heating method. The effects of different DES on the pretreatment of okara cellulose were discussed. The results showed that all three DES could extract okara cellulose， among which the ChCl-O system had the best pretreatment performance， with contents of holocellulose and α-cellulose of 95.8% and 92.6%， respectively. The diameter of ChCl-O pretreated okara cellulose nanofibrils （CNF） obtained after further high pressure homogenization was in the range of 27~30 nm， while the diameter of fiber obtained by the other two DES systems with further high-pressure homogenization was 0.1~0.5 μm.