Preparation and Characterization of Bioplastics Based on Sweet Potato Peel Starch, Aloe vera and Eucalyptus Oil

The aim of this study was to produce and characterize bioplastics derived from sweet potato peel starch, <i>Aloe vera</i> gel, and eucalyptus essential oil. Starch from sweet potato peels was extracted using a wet method, yielding 3.54%, while eucalyptus oil was obtained via steam distillation, with a yield of 1.4%. In order to assess the influence of <i>Aloe vera</i> and eucalyptus oil concentrations on the properties of bioplastics, a 2^2 factorial design was implemented. Consequently, bioplastic films were produced using the casting technique. As a result, the films appeared brown, translucent, and homogeneous, while also exhibiting a rough surface texture. Mechanical testing revealed that the films possessed a high Young's modulus of 41.1 ± 11.1 MPa, a maximum tensile strength of 2.1 ± 0.4 MPa, and an elongation at break of 21.6 ± 4.3%. These properties were achieved with a formulation containing 70% <i>w</i>/<i>w Aloe vera</i>, 0.6% <i>w</i>/<i>w</i> eucalyptus oil, and 5% <i>w</i>/<i>w</i> sweet potato peel starch, suggesting a promising eco-friendly alternative to conventional plastics for potential use in packaging applications.