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Corncob-derived biodegradable packaging films: A sustainable solution for raspberry post-harvest preservation
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Researchers developed biodegradable packaging films from corncob waste that preserved raspberries significantly longer than conventional polystyrene packaging. The films biodegrade in soil within 29 days, offering a sustainable alternative that could reduce microplastic contamination from food packaging. This matters because plastic food packaging is a known source of microplastic and nanoplastic migration into food.
Plastic food packaging, with its harmful migration of microplastics and nanoplastics into food, presents significant ecological imbalance and human health risks. In this regard, using food and agricultural byproducts as packaging materials reduces environmental and economic concerns and supports their sustainable management. Herein, cellulosic residue from corncob was employed as a renewable source for developing biodegradable packaging films. It was solubilized in ZnCl solution, crosslinked with Ca ions, and plasticized with sorbitol to form films and used to improve the shelf-life of raspberries. The optimized film possesses water vapor permeability, tensile strength, and elongation at break of 1.8(4) x10 g s Pa, 4.7(1) MPa, and 15.4(7)%, respectively. It displays UV-blocking and antioxidant properties and biodegrades within 29 days at 24% soil moisture. It preserves raspberries for 7 and 5 more days at room temperature and refrigeration conditions, respectively, compared to polystyrene film. Overall, more value addition could be envisioned from agricultural residues to minimize post-harvest losses and food waste through biodegradable packaging, which also aids in mitigating plastic perils.
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This mini-review examines the potential of corn waste—including husks, stalks, and cobs rich in cellulose, hemicellulose, and lignin—as a feedstock for biodegradable films to replace petroleum-based plastics. Corn waste films produced through casting and extrusion methods show mechanical and barrier properties comparable to conventional plastics with significantly faster biodegradation, and show promise for packaging and agricultural applications.
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Researchers developed a germinable bioplastic from corn cob waste as a biodegradable alternative to conventional plastic materials. The bioplastic can both degrade and support plant germination when placed in soil, offering a sustainable alternative that avoids generating persistent microplastic fragments.
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Scientists created a new food wrap made from corn protein and curcumin (the compound that gives turmeric its color) as a biodegradable alternative to plastic packaging. In tests, this film kept cherry tomatoes and grapes fresher longer by blocking UV light and fighting bacteria and oxidation, all while breaking down naturally instead of piling up as plastic waste. This matters because cutting down on both food waste and plastic packaging could mean fewer microplastics ending up in our food and environment, plus fresher produce on your table.
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This paper is not directly about microplastic pollution. It investigates using berry fruit pomace waste to create biodegradable bioplastic films as an alternative to conventional plastic packaging. While replacing conventional plastics with biodegradable alternatives could reduce future microplastic generation, the study itself focuses on food packaging material development rather than microplastic contamination.
Natural polymer-reinforced starch films: a study on mechanical properties and biodegradability
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Scientists made plastic-free food packaging by mixing potato starch with leftover food waste, banana peels, shrimp shells, and chicken feet, creating films that are stronger and more water-resistant than plain starch alone. Unlike regular plastic, which sheds microplastics and can take centuries to break down, these films degraded 75-90% in soil within just 30 days. This matters because swapping conventional plastic packaging for options like this could mean less microplastic contamination in our food, water, and bodies, while also putting food industry waste to good use.
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