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Development of an Edible Tray Composed of Potato Peel Starch and Coffee Pulp Fiber
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Scientists created an edible food tray made from potato peels and coffee pulp — two food industry "waste" products — that's packed with iron, tackling two problems at once: plastic pollution and childhood anemia (which affects nearly 4 in 10 kids in Peru). Beyond cutting down on plastic waste, this kind of packaging could eventually be eaten along with your food, delivering a nutrient boost while sidestepping concerns about chemicals or microplastics leaching from traditional packaging. The research is still early-stage (lab testing of material strength and iron content), so don't expect these trays at the grocery store just yet
Reducing plastic pollution and combating childhood anemia–which affects over 38.6% of Peruvian children–require sustainable, nutrient-rich alternatives. This study developed iron-fortified edible trays using potato peel starch (PPS), potato peel flour (PPF), and coffee pulp fiber (CPF), an agro-industrial waste containing 44 to 57 mg kg-1 of iron. Using an experimental design with 9 treatments and a control, 2 series were conducted using coarse (CPF-CT) and thin (CPF-TT) fiber. Physical (color, water absorption, and density) and mechanical (tensile and compressive strength) properties were evaluated via analysis of variance (ANOVA), Dunnett’s test, multiple linear regression, Pareto diagram, and principal component analysis (PCA). PCA revealed a critical trade-off between mechanical strength and impermeability, identifying an “optimal packing” zone at 10% CPF-TT, where fiber efficiently fills matrix voids. Consequently, formulations with 2.5% CPF-CT and 7.5% CPF-TT were selected as the most balanced candidates. These samples underwent subsequent Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and nutritional analysis. The formulation containing 50 g PPS, 15 g PPF, and 7.5 g CPF-TT exhibited the highest iron bioaccessibility. These results demonstrate the potential of coffee pulp-reinforced trays as a promising functional packaging solution to address both environmental waste and public health challenges.
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