title: Microwave-assisted methylation of cassava starch with dimethyl carbonate.
abstract: 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.
authors.affiliation: Key Laboratory of Cellulose and Lignocellulosics Chemistry, Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, PR China. sxhmilyweiwei@163.com
authors.forename: Chengmin
authors.initials: C
authors.lastname: Hou
authors.forename: Yufang
authors.initials: Y
authors.lastname: Chen
authors.forename: Wenning
authors.initials: W
authors.lastname: Chen
authors.forename: Wei
authors.initials: W
authors.lastname: Li
mesh_terms: D002236:Carbohydrate Conformation; D005561:Formates / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000592:standards; D002365:Manihot / Q000737:chemistry*; D008745:Methylation; D008872:Microwaves; D012015:Reference Standards; D013213:Starch / Q000737:chemistry*
chemical_list: D005561:Formates; D013213:Starch; C023025:methyl carbonate