| Abstrakt: |
Biodegradable bioplastics are becoming the best solution ever to combat the environmental pollution caused by petroleum-based synthetic plastics. In this study, potato peel starch (PPS)–based bioplastic film was developed by a method of gelatin casting, in which the effect of 13.33, 23.33, and 33.33% v/w (HCl or glycerol to PPS ratio) concentration of HCl and glycerol as well as drying temperature (45 °C, 55 °C, and 65 °C) was studied. The experiment was designed and optimized by a three-variable, three-level Box-Behnken design using Response Surface Methodology (Design Expert® software version 13.0.1). The ANOVA analysis showed that the model was significant with p < 0.0001. The optimum values of the influencing factors were found to be HCl concentration 23.33%v/w, glycerol 20%v/w, and 48 °C drying temperature. The FTIR results confirmed that the compatibility between false banana (Ensete ventricosum) fiber and PPS was attributed to the intermolecular hydrogen bonding and uniform dispersion of fiber during the blending and film formation. The micrograph for pure bioplastic film showed uniform and dense matrix except the irregular dimpled surface formed during the gelatinization process. Peaks were demonstrated at 2θ values of 15.19°, 17.31°, 22.96°, and 24.1° by PPS in the XRD spectrum. Under optimal conditions, a bioplastic film with tensile strength of 6.449 MPa, percent elongation at break of 19.87%, biodegradability of 83.92%, and water absorption of 59.94% was synthesized in this study. Biodegradability studies on the PPS-based bioplastic synthesized by the plasticization of glycerol and sorbitol have shown a biodegradation % of 81.42 and 70.25 in moist soil, respectively. The produced bioplastic film had sufficient physicochemical properties confirming the usage of waste potato peel as a source of starch for the synthesis of biodegradable bioplastics that can substitute conventional plastics. [ABSTRACT FROM AUTHOR] |
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