Related to elongation, it was observed that this property was higher for films with equal proportions of AM and gel if compared to films with a higher proportion of starch. In a study using starch from yam, Mali et al. (2004) obtained films with elongation values between 3.44 and 4.78%. The authors observed that the tensile strength, which ranged from 6.03 to 15.96 N, improves with increasing concentration of starch. According to them, during the drying of the solution to form films, water is evaporated and allows the formation a starch network that bring the chains very near each other, facilitating the formation of a denser matrix (Mali et al., 2004).