Influence of citric acid and curing on moisture sorption, diffusion and permeability of starch films

► Addition of citric acid to TPS reduces moisture content in films up to 70% RH. ► Addition of citric acid to TPS reduces the diffusion coefficient of water. ► Curing films with ≥20 pph citric acid reduce diffusion and moisture content at high RH. ► Possible to compare diffusion coefficient and moisture content with measured WVP.