College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
Carbohydr Polym. 2013 Jan 30;92(1):228-35. doi: 10.1016/j.carbpol.2012.09.075. Epub 2012 Oct 6.
We investigated the use of ionic liquid (IL) 1-allyl-3-methylimidazolium chloride (AMIMCl) for extracting cellulose from Zoysia japonica by using Fourier transform infrared spectroscopy, nuclear magnetic resonance, scanning electron microscopy and thermogravimetric analysis to analyze the IL and its effects on cellulose extraction. After water pretreatment at 121 °C for several minutes, cellulose extraction rate was 71% under optimized conditions, and the yield of cellulose was >99% by AMIMCl. The effectiveness of AMIMCl as an extraction agent can be attributed to the prevalence of intra- and inter-molecular hydrogen bonding in cellulose. By contrast, hemicelluloses were not recovered by AMIMCl because hemicelluloses in plant cell walls are connected to lignin by covalent bonding. Results also showed that the regenerated cellulose was exactly the same as untreated cellulose, except for the degree of crystallinity.
我们研究了离子液体（IL）1-烯丙基-3-甲基咪唑氯化物（AMIMCl）在通过傅里叶变换红外光谱、核磁共振、扫描电子显微镜和热重分析提取结缕草纤维素中的应用，以分析 IL 及其对纤维素提取的影响。在 121°C 下进行几分钟的水预处理后，在优化条件下纤维素提取率为 71%，用 AMIMCl 提取的纤维素得率>99%。AMIMCl 作为提取剂的有效性可以归因于纤维素中存在广泛的分子内和分子间氢键。相比之下，半纤维素不能被 AMIMCl 回收，因为植物细胞壁中的半纤维素通过共价键与木质素相连。结果还表明，再生纤维素与未经处理的纤维素完全相同，除了结晶度。
