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Thermal aging of microplastics during food processing: microplastic release and food safety implications.
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This review summarizes existing research on how heating plastic during food processing, such as infant bottle warming, microwaving and cooking, can break down plastic and release microplastics and added chemicals into food. It describes how heat exposure changes plastic structure and may increase its biological activity, and offers a framework for evaluating these risks.
Plastics used in food processing are frequently exposed to elevated temperature, oxygen, and chemical complex media during food processing, making thermal aging a significant yet underrecognized source of dietary microplastics and nanoplastics (MPs and NPs). Focusing on infant feeding, microwave heating, hot-liquid contact, and household cooking, this review shows that aging can drive chain scission, surface oxidation, changes in polymer structure, additive migration, and the release of MPs and NPs together with co-contaminants, while thermal aging enhances microplastics' biological reactivity, posing potential risks to human health. By integrating evidence from representative food-use scenarios, this review provides a framework for understanding how thermal aging influences contaminant release across food-processing systems and offers guidance for material selection, migration evaluation, and dietary exposure assessment under realistic processing conditions.
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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.
Investigation of the impact of microwave treatment on the aging of polypropylene microplastics
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This study investigated how microwave heating affects polypropylene microplastics used in common food containers, examining changes in surface chemistry, fragmentation, and potential additive release under typical household cooking conditions. Microwave treatment accelerated aging and altered particle properties of polypropylene microplastics, suggesting routine microwave use of plastic containers promotes microplastic release into food.
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.
Investigation of the impact of microwave treatment on the aging of polypropylene microplastics
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This study investigated how microwave heating of plastic food containers affects polypropylene microplastic properties, including surface chemistry and fragmentation potential. Microwave treatment altered the aging state of polypropylene particles, suggesting that routine kitchen use of plastic containers accelerates the release of microplastics into food.
Toxicity enhancement of microplastics released from food containers through thermal aging: Absorbing more serum proteins thus activating the innate immune response via actin polymerization
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Researchers found that heating single-use food containers made of polypropylene, polyethylene, and polylactic acid with fatty food released microplastic particles that became more toxic after aging. The aged microplastics absorbed more blood proteins and triggered stronger immune responses by activating a process called actin polymerization in immune cells. This suggests that reheating food in plastic containers may release microplastics that are especially effective at provoking harmful immune reactions in the body.
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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.