You have no items in your shopping cart.
ABSTRACT
Native starch is underutilized due to it being unsuitable for many Industrial applications. Consequently, the chemical modification process of carboxymethylation was used to improve both the physicochemical and morphological properties of native rice starch. In this study the role of reaction variable on the carboxymethylation of rice starch was investigated using statistical analysis experimental approach. The influence of the etherification reaction parameters on the degree of substitution (DS) and solubility was determined. Using the back titration method we were able to evaluate the changes in the modified starch when compared to native starch. The results showed that the carboxymethylation caused changes in the physicochemical and morphological properties of the native rice starch. Where DS values of (0.17-0.04) and solubility percentage of (12%-40%) were higher than native rice starch. The best rato of NaOH, Anhydroglucose units (AGU) and Monochloroacetic acid was 0.05:4:1 respectively which produced carboxymethyl starch (CMS) of DS 0.17 and solubility percentage of 40%.
