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Initial evaluation of the combined effects of nanoplastics and 17α-ethinylestradiol on D. magna
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This laboratory study examined the combined effects of polystyrene nanoplastics and the synthetic estrogen ethinylestradiol on small aquatic organisms, finding that the combination had different effects than either contaminant alone. The results suggest that nanoplastics can modify how other environmental pollutants affect aquatic life, complicating risk assessment for real-world multi-contaminant exposures.
Exposure of combined pollutants is as of today not a very well-researched field of environmental science due to the complex interactions that may occur. Nanoplastic particles (NP) in particular are lacking studies due to the relatively new interest in the subject. In this study, a small experiment in a lab environment was performed that observed the combined effects of polysterene NP and 17α-ethinylestradiol (EE2), a common steroid found in many contraceptive products, on the commonly used zooplankton Daphnia magna. Observations were made on mortality, reproduction, and neonate growth. When exposed to NP alone, a trend of increased reproduction by the initial set of adults, and a subsequent reduction of growth of the following neonates, to the point of these not being able to produce eggs of their own, could be observed. These effects could not be observed among the specimens treated only with EE2 or the combination of both EE2 and NP, implying an antagonistic interaction between the two pollutants. Lastly, this study implores further research on combined effects of pollutants, and the effects of NP, to improve future environmental risk assessments.
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Combination of nanoparticles from polystyrene and the hormone 17alpha-ethinylestradiol (EE2) in water.
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This study examined the combined effects of polystyrene nanoparticles and the synthetic hormone ethinylestradiol on aquatic organisms, finding that nanoplastics and endocrine disruptors can interact in water environments — raising concerns about the combined toxicity of plastic particles and the chemical pollutants they may carry.
Combined Toxicity of Polystyrene Nanoplastics and Pyriproxyfen to Daphnia magna
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Researchers evaluated the combined toxic effects of polystyrene nanoplastics and the insecticide pyriproxyfen on the water flea Daphnia magna under both acute and chronic exposure conditions. They found that nanoplastics initially reduced the acute toxicity of the pesticide within 24 hours but worsened chronic effects over longer periods. The study suggests that nanoplastics can alter how other environmental contaminants affect aquatic organisms, complicating risk assessments.
Endocrine disrupting effect and reproductive toxicity of the separate exposure and co-exposure of nano-polystyrene and diethylstilbestrol to zebrafish
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Researchers exposed zebrafish to nano-polystyrene and the synthetic estrogen diethylstilbestrol separately and together, finding that combined exposure caused additive disruption of sex hormones and vitellogenin, a dramatic drop in egg production from 1,031 to 306, and a 65% embryo abnormality rate — substantially worse than either pollutant alone.
Polystyrene microplastics increase estrogenic effects of 17α-ethynylestradiol on male marine medaka (Oryzias melastigma)
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Researchers found that polystyrene microplastics increased the estrogenic effects of 17a-ethynylestradiol in male marine medaka, with co-exposure at higher MP concentrations causing greater reproductive disruption than the estrogen alone.
Microplastics and 17α Ethinylestradiol: How Do Different Aquatic Invertebrates Respond to This Combination of Contaminants?
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Researchers tested how microplastics combined with the synthetic hormone ethinylestradiol, a common contraceptive ingredient found in wastewater, affect two tropical estuarine species: oysters and crabs. They found that microplastics carrying the hormone increased toxic effects compared to either pollutant alone, causing oxidative stress and cellular damage across multiple organs. The study suggests that the combination of microplastics and hormone pollutants in waterways may pose greater risks to aquatic life than previously recognized.
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