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PLA - ZnO COMPOSITE WITH BACTERICIDAL AND FUNGICIDAL ACTIVITY
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Scientists created a new plastic material by combining a plant-based plastic (PLA, often used in compostable food containers) with zinc oxide, a mineral known for its germ-fighting properties. Early tests suggest this combo may help reduce bacteria and fungi growth, which could make it useful for things like food packaging that stays cleaner longer. This is preliminary research, though—more testing is needed before we know how well it works in real-world use or whether it's safe for direct food contact.
A plasticized polylactic acid (PLA) composite incorporating zinc oxide (ZnO) was synthesized via melt mixing and hot pressing. The physicochemical and preliminary microbiological properties of the composite were systematically evaluated. ZnO powder, produced through precipitation and calcination, was characterized using dynamic light scattering and nitrogen sorption analysis. The PLA composite, comprising PLA, Proviplast 2624, Span 60, and ZnO, was subjected to tensile and flexural testing, oxygen and water vapor barrier measurements, water uptake analysis, contact angle assessment, and Atenuated Total Reflectance – Fourier Transform Infrared spectroscopy (ATR-FTIR). The ZnO powder exhibited a broad, aggregate-dominated particle-size distribution and a moderate specific surface area. The composite displayed reduced stiffness and strength relative to neat PLA, indicating effective plasticization. Preliminary microbiological assays indicated decreased recovery of the tested microorganisms under the specified conditions.
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