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Subcellular toxicity assessments of microplastics released from food containers
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Researchers tested microplastic particles released from common plastic food containers under heating and freezing conditions and found that each container shed roughly 100,000 to 260,000 particles. When human intestinal cells were exposed to these particles, frozen food containers released the most harmful microplastics, causing damage to cell structures and increased production of harmful molecules called reactive oxygen species. This study suggests that everyday food storage practices, especially freezing in plastic containers, may be an important source of microplastic exposure.
Plastic food containers are widely used for food packaging and storage; however, concerns have arisen regarding the potential releases of microplastics (MPs) from these containers under varying temperature conditions. This study investigated the release and potential cytotoxicity of MPs from food containers subjected to cooling and heating. Caco-2 cells were selected for in vitro studies to assess the toxicity of MPs from food containers. Each food container released approximately 100,000 to 260,000 plastic particles. The total weight of these plastics was between 0.1 and 0.3 mg of each container after extraction. The results revealed the presence of MPs in both polypropylene (PP) and polystyrene (PS) containers, with frozen food containers releasing a greater quantity of smaller plastic particles. The cytotoxicity of the MPs showed a dose-dependent decrease in cell viability, particularly with MPs from frozen food containers. To further investigate the cellular responses to MPs released from food containers, cellular uptake was visualized using Nile Red staining and confocal microscopy. Changes in cellular organelles and enzyme activities were also observed to reveal the potential effects of MPs. Among all treatments, PS food containers stored in frozen conditions exhibited the most significant cellular responses, including alterations in lysosomal number, size, and reactive oxygen species formation. Compared to cell viability, subcellular responses were found to be more sensitive to MPs. Overall, this study provides valuable insights into the presence, properties, and potential health impacts of MPs released from food containers under microwave heating. The findings underscore the need for further research and regulatory measures to mitigate the risks associated with MPs and promote the development of sustainable alternatives in food packaging.
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Plastic takeaway food containers may cause human intestinal damage in routine life usage: Microplastics formation and cytotoxic effect
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Plastic takeaway food containers released hundreds of thousands of microplastics per square centimeter when filled with hot water, with polystyrene containers releasing the most. Both the microplastic particles and the chemical substances leached from the containers damaged human intestinal cells in lab tests, reducing cell survival and disrupting energy metabolism. This suggests that everyday use of plastic food containers -- especially with hot food and drinks -- exposes people to potentially harmful levels of microplastics.
Microwave Heating and Freeze-Thaw Cycles Exacerbate Microplastics and Nanoparticles Release from Plastic Takeout Food Containers: Characterization and Health Risk Assessment
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Lab tests of five types of plastic takeout containers found that heating in a microwave and freeze-thaw cycles increased the release of microplastics and nanoparticles into food, with polylactic acid (PLA) releasing the most and polypropylene (PP) releasing the least. Nanoparticle levels were 4 to 5 times higher than microplastic levels, and microwave use produced the highest estimated health risk scores for all materials tested.
Quantification of microplastics released from plastic food containers during rinsing and migration by pyrolysis-gas chromatography/mass spectrometry
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Researchers measured microplastics released from plastic food containers during normal rinsing and when exposed to different food types and temperatures. All containers released microplastics matching their material, and high-fat foods, extreme temperatures, and longer exposure times increased the amount released. This study confirms that plastic food packaging is an important and direct source of microplastic exposure for people through their everyday meals.
Micro (nano) Plastics Released from Plastic Food Containers
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Researchers found that plastic food containers release micro- and nanoplastics into food under both hot-water and microwave heating, with the quantity increasing with repeated reuse, raising concerns about dietary exposure from everyday kitchen plastics.
Comparative toxicity of microplastics obtained from human consumer products on human cell-based models
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Researchers tested microplastics ground from everyday consumer plastic products, like forks and cups, on eight different human cell types and found that certain cells were notably vulnerable. Endothelial cells and microglial cells showed decreased viability and DNA damage at concentrations as low as 10 micrograms per milliliter. The study suggests that microplastics from real consumer products may pose different risks than the pristine laboratory polymers typically used in toxicity research.
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