微波辅助碳酸二甲酯对木薯淀粉的甲基化作用。
Microwave-assisted methylation of cassava starch with dimethyl carbonate.
机构信息
Key Laboratory of Cellulose and Lignocellulosics Chemistry, Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, PR China.
出版信息
Carbohydr Res. 2011 Jul 1;346(9):1178-81. doi: 10.1016/j.carres.2011.04.001. Epub 2011 Apr 9.
A novel and environmentally friendly process for the methylation of cassava starch with dimethyl carbonate (DMC) could be accelerated by employing a combined strategy: using disodium hydrogen phosphate (Na(2)HPO(4)) as the catalyst (chemical means) and microwave irradiation as the energy source (physical means). By varying the volume of 5% sodium chloride aqueous solution between 50 and 150 mL, the amount of Na(2)HPO(4) between 0 and 1.25 g, the volume of DMC between 75 and 200 mL, and the microwave time from 5 to 20 min, methyl cassava starch with degree of substitution (DS) values in the range of 0.033 and 1.087 was prepared. The chemical structure of methyl cassava starch was analyzed by (1)H NMR spectroscopy.
一种新颖且环保的以碳酸二甲酯（DMC）对木薯淀粉进行甲基化的方法，可通过联合策略加速：使用磷酸氢二钠（Na(2)HPO(4)）作为催化剂（化学手段）和微波辐射作为能源（物理手段）。通过改变 5%氯化钠水溶液的体积在 50 至 150 毫升之间、Na(2)HPO(4)的量在 0 至 1.25 克之间、DMC 的体积在 75 至 200 毫升之间以及微波时间在 5 至 20 分钟之间，可以制备取代度（DS）值在 0.033 至 1.087 范围内的甲基化木薯淀粉。通过（1）H NMR 光谱分析了甲基化木薯淀粉的化学结构。
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