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Polymer- and size-dependent toxicological behavior of environmentally relevant secondary microplastics: a comprehensive review
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Researchers reviewed in-vivo toxicology studies on five common polymer types and found that smaller microplastic particles more readily cross biological barriers and trigger immune responses, with polyethylene, polystyrene, and PET showing the highest translocation potential compared to PTFE and polypropylene.
Microplastics (MPs) generated from commonly used consumer polymers are increasingly recognized as emerging contaminants of toxicological concern. Despite growing evidence, a consolidated understanding of how polymer identity and particle size influence the biological behavior and systemic effects of environmentally relevant secondary MPs remains limited. This review summarizes recent in-vivo evidence using fragmented MPs derived from five major polymers—polyethylene (PE), polytetrafluoroethylene (PTFE), polypropylene (PP), polystyrene (PS), and polyethylene terephthalate (PET). Across studies, smaller particles exhibit greater tendencies for systemic distribution, epithelial barrier disruption, and immune activation compared with larger fragments. Comparative evaluation of biodistribution, histopathology, and physicochemical characteristics highlights consistent polymer- and size-dependent patterns, with PE, PS, and PET showing higher translocation potential, while PTFE and PP often display limited retention. By integrating findings from these in-vivo evaluations, this review provides a clearer understanding of the mechanistic factors governing MP toxicity and identifies key gaps related to exposure duration, environmentally aged particles, and analytical limitations. These insights contribute to establishing polymer-specific and size-resolved perspectives necessary for future microplastic risk assessment.
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Researchers reviewed the production, characterization, and toxicity of environmentally relevant nanoplastics, noting that most existing studies rely on synthetic nanospheres that poorly represent the diverse composition, size, and shape of real-world nanoplastic particles. The review covers mechanical and physicochemical production methods, internalization in human cell lines, and bioaccumulation and systemic effects in model organisms.
Cellular and Animal Toxicities of Micro- and Nanoplastics
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Researchers reviewed evidence from cell and animal studies on the toxic effects of micro- and nanoplastics, finding that these particles can cause inflammation, oxidative stress, and organ damage in laboratory models, raising concern about what chronic low-level human exposure might mean for long-term health.
Toxicity Effects of Micro- and Nanoplastics in Terrestrial Environment
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Researchers examined how micro- and nanoplastics, along with their chemical additives such as bisphenols and phthalates, cause toxicity in terrestrial environments, highlighting how these synthetic polymer fragments disrupt soil ecosystems and expose organisms to compounded chemical hazards.
Microplastic environmental behavior and health risk assessment: a review
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Researchers comprehensively reviewed microplastic pollution across soil, water, and air environments, summarizing findings on aging, toxicity in model organisms, combined effects with heavy metals and endocrine disruptors, and risks to human gastrointestinal, pulmonary, reproductive, and cardiovascular health.
Multi-dimensional View of Microplastic Toxicity: Environmental and Health impacts
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This review takes a one-health approach to microplastic toxicity, synthesizing evidence of harm across atmospheric, aquatic, and terrestrial environments and linking rising microplastic consumption to increasing rates of non-communicable diseases in humans. The authors argue that tackling this crisis requires coordinated action from scientists, public health experts, environmentalists, and the general public working together.
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