Yusriadi et al.: Starch Modification for Enteric Film Coating Polymer ApplicationsThe design and development of modified cassava starch from Indonesia for film enteric coating polymer applications were conducted in this study. The cassava starch was physically modified by heating at 70° to produce pregelatinized cassava starch, followed by chemically modified by esterification to produce pregelatinized cassava starch phthalate. Pregelatinized cassava starch phthalate was formulated to produce film coating polymer with variations of concentration. The results of film coating pregelatinized cassava starch phthalate showed a lower solubility at pH 1.2 and higher at alkaline pH where the optimum results are shown in formula 3 containing pregelatinized cassava starch phthalate with a concentration of 6 % and plasticizer 50 % of the total pregelatinized cassava starch phthalate. The solubility of formula 3 in acidic (pH 1.2) and alkaline medium (pH 7.2) were 11.42 %±2.06 % and 38.91 %±2.23 %, respectively. The highest film polymer tensile strength and Young's modulus was also shown in formula 3 with value of 1.14±0.379 MPa and 3.7×10 -2 ±4.4×10 -3 . These results suggest that pregelatinized cassava starch phthalate has the potential to be utilized as a controlled release film coating polymer that has good mechanical properties.