The chemical composition of the residue is shown in Table 2;being carbohydrates, mainly starch, the principal component. Two different techniques were used to characterize the fibrous fraction of the residue. Total dietary fiber (TDF) and lignin content assays were performed taking into consideration that the fibrous residue derives from an edible root, in order to determine the portion of the residue that acts as dietary fiber. The lignin content was determined in order to evaluate the resistant components proportion of the fibrous residue, which also contributes in a major degree to the reinforcement of the films.