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Optimization and Characterization of Potato Peel Bioplastic: A Green Chemistry Approach Against Plastic Pollution
Summary
Scientists turned potato peels and arrowroot powder, kitchen scraps that usually get tossed, into a plastic-like material that could replace some conventional plastic packaging. This bioplastic held up well against water, broke down significantly in soil within just two weeks, and had reasonable strength and flexibility, making it a promising eco-friendly alternative to plastics that pollute our environment and break down into microplastics, which have been linked to health concerns when they end up in our food, water, and even our bodies.
The millions of tons of plastic accumulated around the globe is posing harmful effects on all ecosystems. Plastic packaging contributes to a major fraction of the accumulated plastics. Replacement of conventional plastic packaging with bioplastics can be an effective approach to reduce the plastic load. Different studies have been done to identify and optimize diverse biological materials for the development of bioplastic. Utilization of biowaste for the development of bioplastic is an efficient waste valorisation approach to deal with the increasing plastic pollution. In the present study, potato peel starch and arrowroot powder have been utilized for the optimization and development of bioplastic, followed by its characterization for water retention capacity, biodegradability, surface morphology, and surface chemistry. Formulation optimization of the bioplastic utilizing response surface methodology resulted in the best optimized formulation of 25.65 g potato peel starch, and 40 g arrowroot powder with 36.97 mL vinegar. The water retention capacity of 16 to 18% of the weight indicated high water resistance of the developed film. The biodegradability evaluation resulted in 46-52% of degradation when dumped in soil over a period of 2 weeks. The surface morphology analysis using scanning electron microscopy revealed a uniform, homogeneous surface at 4000X. The FTIR analysis revealed absorbance at 3290.29, 1734.27 and 1644.04, and 1032.82 cm -1 , showing the presence of O-H, C=O, and C-O functional groups, respectively. The evaluation of mechanical properties gave hardness and tensile strength of 20.2 N and 6.07 MPa, respectively, with elongation of ~10% at break. The optimized formulation of the developed bioplastic film with high water retention, significant biodegradability, effective surface homogeneity, and surface chemistry provides an effective alternative to conventional plastic. Therefore, the present study provides a promising bioplastic formulation utilizing biowaste and can be further analysed for the development of bioplastic products promoting an eco-friendly solution to the increasing plastic pollution.