Sulfation of carboxy starch with sodium pyrosulfate in dimethyl sulfoxide
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Chemical modification of potato carboxy starch in the sodium pyrosulfate— dimethyl sulfoxide system was studied with the aim of preparing water-soluble highly substituted sulfo esters. The dependence of the degree of sulfo group substitution on the reaction conditions was studied in detail. The optimal conditions ensuring formation of water-soluble sulfo esters of carboxy starch with the maximal sulfur content were determined. The carboxy starch sulfo ester samples synthesized were characterized by elemental analysis, IR and 13C NMR spectroscopy, and high-performance exclusion chromatography.
KeywordsSulfur Content Sulfation Carboxy Group Native Starch Chlorosulfonic Acid
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