shows the thickness, water content, water solubility, and soluble-protein content of the films obtained. All the films containing SPI (regardless of its proportion) had a similar thickness, which in all instances was significantly thinner than those of films made from gelatin alone. Moreover, film containing only soybean proteins exhibited significantly higher water content than that of the film containing only gelatin, while composite films had intermediate water contents without significant differences among them. It is noteworthy that in spite of the use of the same total-protein mass and drying conditions for preparing all films, those containing gelatin had a higher thickness in spite of their lower water content. This result indicates a higher degree of compaction in the film matrix when soybean proteins were present, thus suggesting a different degree of molecular unfolding or cross-linking within the protein network of the film.