Abstract:

The surface of starch films was modified through esteritification using Dodecenyl Succinic Anhydride (DDSA) and Octenyl Succinic Anhydride (OSA) as reactants. Orthogonal test designs were carried out to investigate factors influencing degree of substitution of hydroxyl groups in the surface layer of starch films. The results show that when the surface of starch films was modified by DDSA, the concentration of DDSA in ethanol was found to be the primary parameter to affect the degree of substitution of hydroxyl groups. When the surface of starch films was modified by OSA, environment equilibrium humidity was found to be the primary parameter to affect the degree of substitution of hydroxyl groups. When the surface of starch films was modified by the mixture of DDSA and OSA, the concentration of alkaline aqueous solution was found to be the primary parameter to affect the degree of substitution of the hydroxyl groups.

Key words: starch processing, substitution degree of hydroxyl groups, surface modification, alkenyl succinic anhydride, orthogonal test design