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Utilizing the Antioxidant Properties of Coffee By-Products to Stabilize Bioplastics
Summary
This study developed bioplastic films stabilized with antioxidants from coffee production byproducts, improving their resistance to oxidation and light degradation. Bioplastics that resist premature degradation while remaining fully biodegradable are important for reducing microplastic generation from compostable packaging.
Without additives, bioplastics tend to undergo oxidative and light-induced decomposition, which limits technical applications. In addition to the lignocellulosic components, antioxidants in coffee by-products offer a recyclable potential for material utilization and completely bio-based bioplastics. Polyphenols and vitamins prevent or slow down radical-forming processes and thus the ageing of bioplastics if properly prepared. Four naturally processed coffee cherries from different varieties, two parchments, and a silverskin mix were investigated with respect to their composition, micronization, particle size, structure, thermal, and antioxidative properties. Compounded with bio-based poly(butylene succinate) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) in various concentrations, differences were found in extrudability and mechanical properties, next to successful thermo-oxidative stabilization.
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