阔叶木硫酸盐浆木聚糖的乙酰化及表征

Acetylation and characterization of xylan from hardwood kraft pulp.

作者信息

Fundador Noreen Grace V, Enomoto-Rogers Yukiko, Takemura Akio, Iwata Tadahisa

机构信息

Science of Polymeric Materials, Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan; College of Science and Mathematics, University of the Philippines Mindanao, Mintal, Tugbok Dist., Davao City 8022, Philippines.

Science of Polymeric Materials, Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan.

出版信息

Carbohydr Polym. 2012 Jan 4;87(1):170-176. doi: 10.1016/j.carbpol.2011.07.034. Epub 2011 Jul 28.

DOI:10.1016/j.carbpol.2011.07.034

PMID:34662947

Abstract

Alkaline treatment of eucalyptus hardwood kraft pulp with 10% NaOH yielded 6-8% xylan. The acetylation of the extracted xylan was carried in DMAC/LiCl/pyridine system to obtain a series of xylan acetates with different degrees of substitution (DS). Structure elucidation of xylan and xylan acetate was obtained by H and C NMR spectroscopy and other homonuclear and heteronuclear 2D-NMR techniques. Inverse-gated C NMR was employed to determine the DS of xylan acetate. Furthermore, results also revealed equal reactivities at the C-2 and C-3 positions of xylan towards acetylation. Thermal stability, solubility behavior and nanofiber formation of xylan acetate were influenced by its DS values. The mechanical properties of xylan acetate propionate were also investigated.

摘要

用10%的氢氧化钠对桉木硬木硫酸盐浆进行碱性处理，可得到6 - 8%的木聚糖。在二甲基乙酰胺/氯化锂/吡啶体系中对提取的木聚糖进行乙酰化反应，以获得一系列不同取代度（DS）的木聚糖醋酸酯。通过氢核磁共振（H NMR）和碳核磁共振（C NMR）光谱以及其他同核和异核二维核磁共振技术对木聚糖和木聚糖醋酸酯进行结构解析。采用反转门控碳核磁共振来测定木聚糖醋酸酯的取代度。此外，结果还表明木聚糖在C-2和C-3位的乙酰化反应活性相同。木聚糖醋酸酯的热稳定性、溶解行为和纳米纤维形成受其取代度值的影响。同时也研究了丙酸木聚糖醋酸酯的机械性能。