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Polystyrene nanoplastics alleviate the toxicity of CuO nanoparticles to the marine algae Platymonas helgolandica var. tsingtaoensis
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Polystyrene nanoplastics were found to alleviate the toxicity of copper oxide nanoparticles to the marine microalga Chlorella vulgaris, likely by adsorbing copper ions onto their surface and reducing bioavailability. The antagonistic interaction highlights how co-occurring nanomaterials can unexpectedly modify each other's environmental toxicity.
The increasing presence of pollutants such as engineered nanoparticles (ENPs) and nanoplastics (NPLs) poses potential risks to the marine environment. However, there is a scarcity of information on their joint toxic effects. In this study, we investigated the toxicity of copper oxide nanoparticles (nCuO) combined with polystyrene nanoplastics (PS-NPLs) on the marine microalgae Platymonas helgolandica var. tsingtaoensis . The inhibitory effect of nCuO increased with increasing concentrations, and nCuO ≥ 100 mg/L significantly restrained the growth and chlorophyll content of microalgae. nCuO could be adsorbed by algal cells, which was responsible for membrane lipid oxidation and the disruption of membrane permeability. Simultaneous exposure to nCuO and PS-NPLs had a.n antagonistic effect on the growth inhibition of the microalgae, and nCuO played a leading role in the joint toxicity of nCuO and PS-NPLs. In comparison to nCuO exposure alone, combined exposure decreased the oxidative stress and alleviated the increase in the cell membrane permeability of microalgae. PS-NPLs could heteroaggregate with nCuO, which reduced the interaction between nCuO and microalgae, inducing decreased joint toxicity. Findings of this study will clarify our understanding of the joint toxicity of ENPs and NPLs.
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Single and combined toxicity of polystyrene nanoplastics and copper on Platymonas helgolandica var. tsingtaoensis: Perspectives from growth inhibition, chlorophyll content and oxidative stress
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Researchers investigated the single and combined toxicity of polystyrene nanoplastics and copper on the marine microalga Platymonas helgolandica. The study found that copper alone inhibited growth in a dose-dependent manner, while nanoplastics modified copper's bioavailability and altered the combined toxic response. The results suggest that the interaction between nanoplastics and heavy metals can produce complex toxicity patterns that differ from individual exposures.
Polystyrene nanoplastics diminish the toxic effects of Nano-TiO2 in marine algae Chlorella sp.
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Researchers found that polystyrene nanoplastics reduced the toxic effects of nano-titanium dioxide on marine algae by forming larger aggregates that decreased the bioavailability of both particle types. The combined exposure led to lower oxidative stress and reduced cellular damage compared to nano-titanium dioxide alone. The study demonstrates that interactions between different types of nanoparticles in marine environments can produce antagonistic effects that alter their individual toxicity profiles.
Influence of polystyrene microplastic and nanoplastic on copper toxicity in two freshwater microalgae
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Researchers studied how polystyrene microplastics and nanoplastics affect the toxicity of copper to two freshwater microalgae species over extended exposure periods. They found that microplastics generally reduced copper toxicity by adsorbing copper ions, while nanoplastics had more variable effects depending on concentration and algal species. The study highlights that the size of plastic particles plays an important role in how they modify the bioavailability and toxicity of heavy metals in aquatic environments.
Antagonistic effect of polystyrene nanoplastics and sliver nanoparticles on Chlorella pyrenoidosa
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Researchers tested antagonistic interactions between polystyrene nanoplastics and silver nanoparticles on the freshwater green alga Chlorella, finding that combined exposure produced less toxicity than either agent alone, suggesting that plastic particles can sequester silver nanoparticles and reduce their bioavailability.
Mitigated toxicity of polystyrene nanoplastics in combination exposure with copper ions by transformation into copper (I) oxide: Inhibits the oxidative potential of nanoplastics
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Researchers investigated how combining polystyrene nanoplastics with copper ions affects toxicity in laboratory and animal models. They found that when copper interacted with the nanoplastics, it transformed into copper oxide, which actually reduced the overall toxicity by inhibiting the oxidative potential of the plastic particles. The study provides evidence that the combined environmental behavior of nanoplastics and metals can produce unexpected toxicological outcomes.
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