Effect of the storage relative humidity on the physicochemical properties of corn starch edible films obtained by a combination of extrusion process and casting technique

Starch is one of the most used polysaccharides in formulation Edible Films (EFs). This work aimed to develop starch-based EFs employing extrusion technology as a pretreatment casting technique and evaluate storage relative humidity (RH) effect determine their possible application food coating. Corn starch mixture plasticizers (sorbitol glycerol) were processed twin-screw extruder. The was for formation. conditioned at different RH (53, 75, 100%) ten weeks. studied response variables were: puncture resistance (PR), deformation (PD), water vapor permeability (WVP), solubility (WS), X-ray diffraction patterns, crystallinity. 53 75% showed stable behavior PR PD. Concerning barrier properties, it found that stored 53% had lowest value WVP XRD patterns showing time produces crystalline zones by aging effect. Starch-based obtained combination extrusion-casting an presented best physicochemical properties. Hence, these could be coatings intermediate moisture foods.