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Protein binding on acutely toxic and non-toxic polystyrene nanoparticles during filtration by Daphnia magna
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Researchers investigated protein binding on acutely toxic versus non-toxic polystyrene nanoparticles during filtration by Daphnia magna zooplankton, finding that the two particle types bind different protein profiles, suggesting that surface protein corona composition may help explain differential toxicity outcomes.
Toxic and non-toxic polystyrene particles bind different proteins during filtration by zooplankton.
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Researchers discovered that proteins secreted by Daphnia magna create an eco-corona around polystyrene nanoparticles, increasing their uptake and toxicity. The study found that this protein coating also made the nanoparticles harder to remove from the gut, demonstrating a previously unknown biological mechanism that enhances the harmful effects of nanoplastics on this important indicator species.
Structure of soft and hard protein corona around polystyrene nanoplastics—Particle size and protein types
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Researchers characterized the protein corona that forms around polystyrene nanoplastics of different sizes, finding that particle size influences which proteins bind and how tightly, with implications for nanoplastic toxicity and biological uptake.
Controlled protein mediated aggregation of polystyrene nanoplastics does not reduce toxicity towards Daphnia magna
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Researchers found that protein-mediated aggregation of polystyrene nanoplastics into larger clusters did not reduce their toxicity to Daphnia magna, whereas solid particles of equivalent aggregate size were non-toxic, suggesting aggregation state alone does not determine nanoplastic hazard.
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Researchers examined how size and surface charge of polystyrene nanoplastics (20-100 nm) affected their behavior and toxicity to Daphnia magna in different water media, finding that smaller particles and certain media compositions significantly increased toxicity and aggregation patterns.
Investigating the toxicities of different functionalized polystyrene nanoplastics on Daphnia magna
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Researchers compared the toxicity of plain and surface-modified polystyrene nanoplastics on Daphnia water fleas, finding that unmodified particles were most lethal by activating stress kinase pathways, while surface-functionalized particles were less toxic — largely because positively charged particles aggregated rapidly in water and reduced their effective exposure concentration.
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