Effects of acetic acid/acetic anhydride ratios on the properties of corn starch acetates

► The molar ratio acetic acid to acetic anhydride of 1:1 gave the highest degree of substitution. ► The variation of the ratio acetic acid:acetic anhyride change the physical properties of starch acetate. ► Using microwaves radiations, iodine act as a good catalyst in solvent free condition.