Key Laboratory of Cellulose and Lignocellulosics Chemistry, Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, PR China.
Carbohydr Res. 2012 Jul 1;355:87-91. doi: 10.1016/j.carres.2012.04.017. Epub 2012 May 4.
By combining the acceleration strategies of using thiocarbamide as a active catalyst, incorporating dimethyl carbonate (DMC) as a solvent and methylating reagent and applying microwave irradiation as energy resource, methylation of cassava starch can be performed efficiently to a high degree of substitution (DS=0.6) within 4 min. The structures of native cassava starch and methylated starch were characterized by (13)C NMR spectroscopy. Their thermal property and crystal structure were studied by thermogravimetric analysis (TG and DTG) and powder X-ray diffractometry.
通过将硫脲作为活性催化剂的加速策略相结合，采用碳酸二甲酯（DMC）作为溶剂和甲基化试剂，并应用微波辐射作为能源，木薯淀粉可以在 4 分钟内高效地进行甲基化，取代度（DS=0.6）达到很高的水平。通过（13）C NMR 光谱对天然木薯淀粉和甲基化淀粉的结构进行了表征。通过热重分析（TG 和 DTG）和粉末 X 射线衍射法研究了它们的热性能和晶体结构。
