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Thermal and Packaging-Related Nanoparticles in Food: Formation Pathways, Migration Mechanisms, and Toxicological Considerations
Summary
This review pulls together existing research on tiny nanoparticles that either form when we cook food at high heat or leach into food from packaging materials (like containers with antimicrobial nanosilver). While migration from packaging generally stays within current safety limits, scientists still don't fully understand what these particles do to our bodies over years of exposure, especially since testing methods vary widely between studies. The bottom line: like the ongoing concerns about microplastics, this is an emerging area where the science is still catching up to how common these particles already are in our daily meals.
The increasing prevalence of nanoparticles (NPs) in the food sector, either formed during thermal processing or released from packaging materials, raises critical questions regarding their potential health effects. This review explores the generation of food-derived nanoparticles (FDNPs), particularly fluorescent carbon nanoparticles (CNPs), during cooking and food processing, and the migration of engineered nanoparticles (ENPs), such as nanosilver, from food-contact materials. High-temperature cooking processes promote the formation of CNPs with diverse physicochemical properties, which can influence absorption, biodistribution, and potential toxicity. Migration studies reveal that ENPs can leach into food simulants. Migration rates generally increasing with temperature and storage duration, although usually remaining within current regulatory limits. Despite growing interest, significant gaps remain in the field of food nanotoxicology, particularly regarding long-term exposure risks and the relevance of current experimental models. This review emphasizes the urgent need for standardized analytical methodologies, mechanistic toxicological research, and comparative studies between industrial processing and domestic cooking scenarios to better assess the implications of nanoparticle exposure through the diet.