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Acute toxicity of triclosan, caffeine, nanoplastics, microplastics, and their mixtures on Daphnia magna
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Researchers tested the acute toxicity of triclosan, caffeine, nanoplastics, and microplastics individually and in mixtures on the water flea Daphnia magna. They found that nanoplastics were more toxic than microplastics, and mixtures of these pollutants with triclosan or caffeine produced varying levels of combined toxicity. The study highlights that environmental pollutants rarely occur in isolation, and their mixtures may have unpredictable effects on aquatic organisms.
We measured acute toxicity of triclosan, caffeine, nanoplastics, and microplastics, and their mixtures on Daphnia magna. Limitations of this study included use of a single species, acute rather than chronic toxicity testing, examination of single substances and their mixtures, and laboratory conditions that may not reflect real-world scenarios. Single compound toxicity results revealed a clear concentration-response pattern, with triclosan showing higher toxicity than caffeine, and nanoplastics displaying higher toxicity than microplastics. Combinations of triclosan with nanoplastics, and microplastics resulted in varying mortality rates, with higher rates observed with increased concentrations of triclosan and nanoplastics. Similar results were observed with caffeine, nanoplastics, and microplastics mixtures. These findings underline potential hazards posed by these pollutants to marine ecosystems and highlight the need for further studies to understand chronic effects, interactive effects of multiple substances, and the impact under more environmentally relevant conditions.
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When water fleas (Daphnia magna) were exposed to mixtures of HDPE, LDPE, and polypropylene microplastics together, the combined toxicity was substantially greater than any single polymer alone, with the mixture LC50 dropping to 77 mg/L compared to 109–123 mg/L for individual plastics. This synergistic effect — reducing survival, reproduction, and normal swimming behavior — is an important finding because organisms in nature encounter mixtures of plastic types, not just one at a time.
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.
Synergistic toxic mechanisms of microplastics and triclosan via multixenobiotic resistance (MXR) inhibition–mediated autophagy in the freshwater water flea Daphnia magna
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Researchers exposed water fleas to microplastics and triclosan, a common antimicrobial chemical, and found that the combination was more toxic than either pollutant alone. Microplastics interfered with the organisms' natural defense system for expelling foreign chemicals, allowing triclosan to accumulate and trigger harmful autophagy. This suggests that microplastics may amplify the toxicity of other environmental contaminants in aquatic ecosystems.
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