The mechanical characterization of films is presented in Fig. 2.
Kefiran films showed tensile strength ranging between 8.1 MPa and
14.6 MPa (Fig. 2a). The incorporation of microorganisms to unplasticized kefiran films leads to a significant decrease in this parametervalue. The same trend was found by Kanmani and Lim (2013)for pullulan-starch films.