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Thermally Induced Micro and Nanoplastic Leaching from LDPE Food Packaging: In Vitro Cytotoxicity in H9C2 Cardiac Cells
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When plastic food covers (like the LDPE wrap you might use to store leftovers) are heated to boiling temperatures, they shed tiny plastic particles and chemicals into their surroundings. In lab tests, these leached substances damaged heart muscle cells, with more damage occurring the longer the plastic was heated. This suggests that microwaving or heating food under plastic covers could pose real risks to heart health, and safer packaging guidelines may be needed.
Micro and nanoplastic (MNP) leaching from food packaging poses an emerging public health concern, particularly when packaging materials are exposed to elevated temperatures during food storage and transport. This study investigated the release of MNP-derived compounds from low-density polyethylene (LDPE) food packaging covers subjected to thermal stress at 100 °C for 2 h (Sample A) and 4 h (Sample B). The MNP leachate was characterized by UV–Visible spectroscopy, Fourier transform infrared (FTIR) spectroscopy, X- ray diffraction analysis (XRD), liquid chromatography – mass spectrometry (LC–MS), and Field Emission Scanning Electron Microscopy (FE-SEM). UV–Visible spectroscopy revealed a concentration-dependent increase in leached compounds with prolonged heating, while XRD confirmed the presence of LDPE polymer fragments alongside inorganic additives including calcium carbonate, aluminum-based compounds, and iron. LC–MS analysis identified a complex mixture of organic compounds of varying molecular weights in Sample B, indicating the co-release of polymer degradation products and chemical additives under thermal conditions. FE-SEM confirmed MNP particle formation with irregular surface morphology and progressive structural degradation. MTT cytotoxicity assay on H9C2 cardiac cell lines demonstrated a dose-dependent reduction in cell viability, with an IC50 of 47.23 µg/mL, indicating notable cardiotoxic potential of LDPE leachates. These findings highlight the need for stringent safety evaluation of plastic food packaging materials used under thermal conditions.
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Unveiling Microplastic Leaching from Food Packaging Polyethylene Covers: A Preliminary Study
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Researchers investigated microplastic leaching from polyethylene food packaging materials into food simulants under different temperature and contact time conditions. The study found that leaching increased with temperature and prolonged contact, raising concerns about dietary microplastic exposure from packaged foods.
Potential Effects of Orally Ingesting Polyethylene Terephthalate Microplastics on the Mouse Heart
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This study found that mice fed PET microplastics (the type of plastic used in water bottles and food containers) developed heart damage, including broken muscle fibers, significant scarring, and cell death in heart tissue. The damage was driven by a buildup of harmful oxygen molecules (oxidative stress) that overwhelmed the heart's natural defenses. These findings raise concern about the potential cardiovascular effects of PET microplastics that humans commonly encounter in food and drink packaging.
Invisible plastic release from overlooked usage practices in microwaved food packaging
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Microwaving food in plastic packaging like rice ball wrappers or milk cartons causes it to shed tiny plastic particles—including nanoplastics—into your food, and the longer you microwave, the more plastic breaks free. In lab tests, these plastic bits harmed liver cells and increased cell stress, suggesting a common kitchen habit most of us don't think twice about could be adding an invisible dose of plastic to our meals.
Rapid Generation of Microplastics and Plastic-Derived Dissolved Organic Matter from Food Packaging Films under Simulated Aging Conditions
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Researchers found that common plastic food packaging (low-density polyethylene film) releases large numbers of microplastics and hundreds of dissolved chemical compounds when exposed to everyday conditions like microwaving, heating, or UV light. Under simulated aging, the films released 15 to 453 times more microplastics than untreated controls. The study suggests that routine food preparation and storage practices may be a significant source of microplastic and chemical exposure.
Nanoplastics in heat-sensitive food packaging: A review of migration, detection, health, and environmental impacts
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This review examines how heating food in plastic packaging causes micro and nanoplastics to migrate into food, covering the mechanisms of release, detection methods, and health concerns. Heat accelerates the breakdown of plastic packaging, releasing particles and chemical additives that can be consumed along with the food. The authors highlight the need for stronger regulations and safer packaging alternatives to reduce human exposure to plastics through heated food.
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