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The influence of different polymer types of microplastics on adsorption, accumulation, and toxicity of triclosan in zebrafish
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Researchers investigated how different polymer types of microplastics affect the toxicity and bioaccumulation of the antimicrobial chemical triclosan in zebrafish. They found that polypropylene microplastics had the highest capacity to adsorb triclosan and that co-exposure significantly worsened oxidative stress, lipid damage, and neurotoxicity compared to triclosan alone. The study demonstrates that the type of microplastic polymer matters when assessing the combined environmental risks of plastics and chemical pollutants.
Although the combined effects of microplastics (MPs) and other organic pollutants have raised increasing attention, the impacts of polymer types on the biological effects (e.g., bioaccumulation and toxicity) of the mixtures are still unclear. This study aimed to evaluate the influence of different polymer types of MPs including polyethylene (PE), polypropylene (PP), and polyvinyl chloride (PVC) on the adsorption, accumulation, and toxic effects of triclosan (TCS) in zebrafish. As a result, all three types of MPs could adsorb TCS and PP-MPs has the highest adsorption capacity for TCS (1.18 mg/g). Compared with the TCS alone, MPs changed the distribution of TCS in tissues and increased the accumulation of TCS in the liver and gut following the order of TCS + PP > TCS + PVC > TCS + PE. Compared with individual TCS and PP-MPs, after co-exposed for 28 days, TCS + PP significantly aggravated oxidative stress and lipid peroxidation in the liver as well as enhanced neurotoxicity in the brain. Moreover, TCS + PP disturbed the metabolism in the liver and MPs contributed more to the metabolic disorders. The upregulated lipid metabolites (e.g., sphingosine and L-palmitoylcarnitine) and downregulated carbohydrate metabolites (e.g., sucrose) could be potential targets for future risk assessment of MPs combined with other pollutants.
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Adsorption behavior of triclosan on microplastics and their combined acute toxicity to D. magna
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Researchers studied how the antibacterial chemical triclosan attaches to different types of microplastics in water and tested their combined toxicity on water fleas. They found that triclosan readily adsorbed onto polystyrene, polyethylene, and polypropylene microplastics, with the process influenced by water chemistry factors like pH and salt content. When water fleas were exposed to microplastics carrying triclosan, the combined toxicity was greater than from either contaminant alone.
Comparative impact of pristine and aged microplastics with triclosan on lipid metabolism in larval zebrafish: Unveiling the regulatory role of miR-217
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Scientists found that when microplastics and the antimicrobial chemical triclosan coexist in water, microplastics increase the amount of triclosan that accumulates in zebrafish larvae, disrupting fat metabolism through a specific genetic pathway. Aged microplastics, which have weathered surfaces, actually carried less triclosan and caused less harm than fresh microplastics. This research shows how microplastics can amplify the toxic effects of common household chemicals in aquatic organisms that are part of the food chain.
Does triclosan adsorption on polystyrene nanoplastics modify the toxicity of single contaminants?
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Researchers investigated whether triclosan adsorption onto polystyrene nanoplastics modifies the toxicity of each contaminant individually, using a multi-tiered approach to assess how nanoplastic carrier effects alter the combined hazard of this common antimicrobial agent in aquatic environments.
Influence of microplastics on bisphenol A and bisphenol AF toxicity in aquatic environments: Mechanistic insights for environmental risks
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Researchers investigated how polyethylene microplastics interact with the industrial chemicals bisphenol A and bisphenol AF in zebrafish, finding that microplastics can either reduce or worsen the toxicity depending on the specific chemical and biological pathway involved. For bisphenol A, the microplastics partially absorbed the chemical and reduced its harmful effects, but for bisphenol AF, they worsened toxicity to certain organ systems. The study reveals that microplastics play a complicated dual role in modifying how other pollutants affect aquatic life.
Interactions of microplastics and organic compounds in aquatic environments: A case study of augmented joint toxicity
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Researchers investigated how polystyrene microplastics interact with the antimicrobial compound triclosan in simulated environmental and cellular conditions. They found that surface-functionalized microplastics adsorbed significantly more triclosan and released it under cellular conditions, with the combination producing greater toxicity to human intestinal cells than either contaminant alone. The study suggests that microplastics can amplify the harmful effects of co-occurring organic pollutants.
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