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ABSTRACT
Granular carboxymethyl cassava starch with D.S of 0.1, 0.13, 0.16, 0.21 was synthesized using a modified dry Process. The carboxymethylation reaction was carried out with granular cassava starch, NaOH Pellets and monochloroacetic-acid (MCAA) The effect of the reaction temperature, molar ratio of monochloroacetic acid to starch on the degree of substitution of cms was investigated D.S of 0.1, 0.13, 0.16, 0.21 was obtained for reaction at room temperature for 2-hours with a molar ratio of MCAA – STARCH to be 4:1, 1.5:1, 1:1.5, 1:4. This study investigate the relationship between the degree of substitution (D.S) and the solubility of the resulting carboxymethyl starch (CMS). The D.S which represent the extent of substitution of the hydroxyl group on starch molecules by monochloroacetic acid (MCAA) has Proved that D.S with a value of 0.21 has the highest D.S and also has the highest % of solubility of 70% while D.S with a value of 0.1 has the least % of solubility of 20%, which is because of the varied ratios of monochloroacetic acid.
