机械活化木薯淀粉的光谱分析

Spectrum Analysis of Mechanical Activated Cassava Starch

采用机械活化的方法对木薯淀粉进行处理,利用X射线衍射、红外光谱及激光光谱等方法对处理后木薯淀粉的结晶结构、分子基团和粒径分布进行分析。研究结果表明,机械活化可以有效降低木薯淀粉颗粒的粒径,且粒径线性回归的趋势分布随活化时间不同而迁移,机械活化能破坏木薯淀粉的结晶结构,在X射线衍射图上表现为结晶衍射峰消失,机械活化可以增加木薯淀粉中反应基团游离羟基的数量,尤其使伯羟基的数量增加。

Cassava starch was processed by mechanical activation.Crystal structure,molecular group and particle size distribution of processed cassava starch were studied by X-ray diffraction,infrared spectroscopy and laser spectroscopy.The results showed that particle size of cassava starch could be reduced effectively by mechanical activation,and distribution of its linear regression trend was shifted with different activation time.Mechanical activation energy could destroy crystal structure of cassava starch,shown as disappearance of crystal diffraction peak in the X-ray diffraction diagram.And mechanical activation could increase the number of reactive free hydroxyl of cassava starch,especially primary hydroxyl.