离子液体1-烯丙基-3-甲基咪唑分离毛竹半纤维素研究

Isolation of hemicelluloses by 1-allyl-3-methyl imidazole ionic liquids from bamboo

以毛竹为原料,通过1-烯丙基-3-甲基咪唑室温离子液体([Amim]Cl)直接分离半纤维素,并利用红外光谱检测、热动力学分析、中性糖成分检测、糖醛酸含量测定和一维核磁共振成像等分析手段证明氯化1-烯丙基-3-甲基咪唑离子液体可直接分离毛竹半纤维素。所得组分中不含有木质素杂质但混有少量纤维素和果胶质,毛竹半纤维素结构是以(1→4)-β-D-木聚糖为主链,以阿拉伯糖和4-O-甲基-α-D-葡糖醛酸为侧链的木聚糖,其中阿拉伯糖以C-3位与木聚糖主链相连,4-O-甲基-α-D-葡糖醛酸则以O-2位与木糖主链相连。

In this paper, hemicellulose was directly separated through the 1-allyl-3-methyl imidazolium room temperature ionic liquid （ [ Amim ] C1） from Moso bamboo. The structures of the hemicelluloses were elucidated by FTIR, thermal ^13 analysis, CNMR spectroscopy, content of neutral sugars and uronic acids. The results show that the room temperature ionic liquid treatment are effective on the separation of hemicelluloses from bamboo, and the components mixed with a small amount of pectin but not contain lignin and cellulose. The hemicellulosic fraction has a backbone of （1→4）-β-D-xylan and acre branched mainly through arabinose and 4-O-methyl-α-D-glucuronic acid,which arabinose at C-3 position of main chain and 4-O-methyl-α-D-glucuronic acid atO-2 position.