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Preparation of irregularly shaped, nano-sized, fluorescent microplastic particles for tracing cellular uptake

Environmental Science Advances 2026
Ryo Nagasawa, Ryo Nagasawa, Sota Inoue, Takashi Miyano, Masakazu Umezawa, Masakazu Umezawa

Summary

This study found that irregularly shaped microplastic particles — which more closely resemble real-world plastic fragments than the smooth spheres used in most lab research — are taken up by human cells even at very low concentrations of just 2 micrograms per milliliter, a threshold far below what previous sphere-based studies reported. This suggests that standard lab experiments using spherical particles may significantly underestimate the risk of cellular microplastic uptake.

Cellular uptake of irregularly shaped microplastics (MPs) is observed even at extremely low concentrations (2 µg/mL), unlike spherical MPs reported in previous studies.

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