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Deconstructing Food Packaging: Component-Specific Sources of Micro and Nanoplastics in Foods and Beverages
Summary
This review paper looked at how tiny plastic particles end up in your food and drinks, and found that different parts of packaging—like bottle caps, container walls, and coatings—shed plastic in different ways, with things like repeatedly twisting a cap on and off actually generating measurable amounts of plastic debris. This matters because knowing exactly which packaging part is the culprit could help manufacturers redesign products to reduce the plastic particles we're unknowingly consuming. It's not new evidence of health harm, but it's a step toward figuring out where these contaminants come from so they can eventually be reduced.
Micro and nanoplastics (MNPs) are increasingly recognized as contaminants in food systems; however, the specific packaging elements responsible for particle release remain poorly resolved. Most studies treat packaging as a single material category, without covering distinct contributions from the different units of modern food contact materials (FCMs). We propose a packaging structure taxonomy based on functional elements: container (C), closure (CL), and functional layers (F), including operational interfaces (+I), designed to enable components attribution of possible origins of plastic fragments in foods and beverages. Through a structured synthesis of the current literature, we map the primary processes leading to MNP generation across these modules, including tribological abrasion at closure contact interfaces, thermally driven polymer degradation in containers and delamination or shedding from coatings, adhesives and multilayer structures. Available evidence indicates that repeated mechanical actions such as opening and closing cycles can generate measurable particle release from closure assemblies. The proposed C/CL/F + I framework introduces standardized descriptors and reporting units that improve comparability across studies and supports origin attribution. By explicitly separating packaging parts and their operational interaction zones, the taxonomy provides a methodological bridge between analytical microplastic detection and engineering strategies aimed at minimizing particle formation. Its adoption can facilitate harmonized experimental design, strengthen regulatory risk assessment and guide the development of packaging configurations that minimize plastic particle shedding into foods.