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Risk assessment of silver and microplastics release from antibacterial food containers under conventional use and microwave heating
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Researchers tested whether antibacterial food containers made with silver release potentially harmful substances during normal use and microwave heating. The study found that polypropylene containers released significant amounts of silver that increased with temperature, acidity, and repeated use. In addition, microplastic particles were detected in the food simulants, raising questions about the safety of reusable antimicrobial plastic food packaging.
The evaluation of the migration of ionic silver and nanoparticulated silver (AgNPs) from antimicrobial plastic packaging to food is crucial to ensure its safety. Migration assays were performed on reusable silver-containing polypropylene (PP) food containers and a silicone baby bottle, using food simulants, under conventional or microwave heating and repeated use. The PP containers released significant amounts of silver, increasing with temperature, contact time, acidity and lower crystallinity. Silver migration in the silicone bottle was much lower. Risk assessment of released silver was done considering European authorities safety recommendations, with some containers far exceeding these levels. No significant AgNPs release was detected in the simulants by single particle-ICPMS. Silver-containing microplastics and silicone microparticles were detected by SEM in the food simulants after the migration assays. Consumers may be continuously exposed to the harmful effects of ionic silver and microplastics, which can potentially lead to health issues.
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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.
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.
Human intake assessment of triclosan associated with the daily use of polypropylene-made antimicrobial food packaging
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Researchers assessed human exposure to triclosan, an antimicrobial chemical, from everyday use of Microban-branded microwave-safe food containers. They found that both direct chemical migration from the containers and microplastics released during microwave heating contributed to significant triclosan intake, with estimated weekly exposure levels raising health concerns. The study calls for a worldwide ban on triclosan in food-contact materials and better compliance testing, especially for products sold through online platforms.
Quantifying mechanical abrasion of AgNP nanocomposites: influence of AgNP content on abrasion products and rate of microplastic production
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When silver nanoparticle (AgNP) composite plastics are abraded — mimicking normal use wear — they release microplastic fragments that still contain embedded silver nanoparticles, with release rate depending on how much AgNP was incorporated. This matters because silver nanoparticles have known antimicrobial and potentially toxic properties, so products designed with AgNPs for their antibacterial benefits may inadvertently create a combined microplastic-nanomaterial pollution hazard.
Release of Nanoplastics from Polypropylene Food Containers into Hot and Cold Water
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Researchers tested polypropylene food storage containers and found they release both nanoplastics and microplastics into water, with significantly higher amounts released when hot water at 90 degrees Celsius was used compared to room temperature. The nanoplastics ranged from 122 to 397 nanometers in size and were chemically confirmed as polypropylene. The study provides direct evidence of nanoplastic exposure from everyday food container use and highlights the importance of including these tiny particles in health risk assessments.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.