Results (
Thai) 2:
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Conclusions
All the biofilms resulting from this research were transparent, homogeneous and easy to handle. No residues were found on detachment from the drying support plate. All samples were 100% soluble in acid solutions. The values for water vapor permeability, solubility in water, thickness and mechanical resistance of the bioplastics increased with the increase in gelatin concentration. This was observed in bioplastics plasticized with both glycerol and sorbitol. The addition of gelatin also resulted in a reduction in opacity of the bioplastics (plasticized with both, sorbitol and glycerol), probably due to a decrease in the crystallinity of the system. An increase in starch concentration from 3 to 5 g/100 g, resulted in an increase in thickness and an increase in the mechanical properties of the bioplastics, for both plasticizers. The elongation at
break of the samples plasticized with glycerol increased with an increase in the gelatin or starch concentrations. Higher values for elongation at break were observed for the bioplastics made with modified manioc starch when compared with those made with native manioc starch in the same ratios.
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