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Microwave-assisted methylation of cassava starch with dimethyl carbonate.

Carbohydrate research (2011-05-03)
Chengmin Hou, Yufang Chen, Wenning Chen, Wei Li
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.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Dimethyl carbonate, ReagentPlus®, 99%
Sigma-Aldrich
Dimethyl carbonate, anhydrous, ≥99%