糖或酸介质处理对烟草纤维素结构的影响

Effect of sugar or acid medium treatment on cellulose structure in tobacco

为探索烟草纤维素结构的改善方法,提高低次烟叶和烟梗的使用价值。分别用2%的5种糖溶液(葡萄糖、果糖、木糖、甘露糖、蔗糖)和2种酸溶液(柠檬酸和苹果酸)浸泡烟样3 d,之后按照行业标准方法提取纤维素,利用^(13)C固态核磁波谱法(^(13)C NMR)、X射线衍射法(XRD)和红外光谱法(FTIR)研究了处理前后烟草纤维素的晶型、结晶度以及原纤尺寸等结构信息的变化。结果表明,介质处理后烟草纤维素的晶体类型没有改变,但其形态结构发生了变化,除果糖外的介质处理均使纤维素的含量和结晶度下降,相对应的基原纤聚集束尺寸也有下降,尤其是柠檬酸和苹果酸介质处理。这些变化对纤维素反应的可及度和均一性以及细胞壁类物质的降解均有有利影响。

To explore structure of cellulose and improve utilization rate of low-grade tobacco leaves and leaf stem,five sugar medium solutions（glucose,fructose,xylose,mannose and sucrose） and two acid medium solutions（citric acid and malic acid） with concentration of2%were used to treat tobacco.Effects on the structure of cellulose from these tobacco samples were studied by 13C NMR,XRD and FTIR spectroscopy.Results showed that medium treatment did not change crystalline allomorphs type of cellulose,but changed its morphological structure.All but fructose treatment decreased content,crystallinity of cellulose,and elementary fibrils aggregate size,especially after mannose and malic acid treatment.These changes were beneficial for the reaction and accessibility between cellulose fibril surfaces and medium solution due to degradation of cell wall materials.