Synthesis and characterization of biofilms using native and modified pinhمo starch

In the present work, native pinhمo starch, modified pinhمo starch (hydrolyzed with different concentrations of HCl), glycerol and xanthan gum were used to produce biofilms. The synthesis of filmogenic solutions was performed by casting. The biofilms were characterized by measurement of thickness, Environmental Scanning Electron Microscopy, Water Vapor Permeability, Differential Scanning Calorimetry and Water Solubility. The results showed that there was an increase in the water solubility of the biofilms and a reduction of the water vapor permeability due to the modification of the starch. According to the thermal analysis, the starch modification process did not promote changes in the glass transition temperature of the films. The biofilms also exhibited good resistance to high temperatures. Moreover, jaboticaba flour was added to the composition of the biofilm to test the use of the anthocyanins as an indicator due to its ability to change color at different pH values.