木薯淀粉硫酸酯理化性能的研究

he low degree of substitution of starch sulfate ester (SSE) was synthesized in aqueous solution from cassava starch with the esterification agent like NaHSO3 and NaNO2, the properties of SSE paste were determined by its freeze-thaw stability, anti-aging capacity, transparency and viscosity, and the influence of pH value and the medium NaCl on the paste viscosity.The conclusions showed that, after esterification, the transparency of the SSE was increased by 22.4% , the viscosity of SSE paste was higher, the transparency stability was enhanced, and the retrogradation trend was weakened, as for the freeze-thaw stability as well as the storage stability improved. The SSE paste viscosity changed slightly in an alkaline condition, but gradually descended with the increase of acidity, as for the acid-resistant performance, the SSE with high DS was superior to that with low DS; while NaCl had little effect on the viscosity characteristics of SSE starch pastes, the FT-IR showed that 1346cm-1 and 1186 cm-1 were the characteristic absorption peaks of sulfate groups.