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Encapsulation and release of tetrabromobisphenol A in microplastics: Trade-off in their individual toxicity to Xenopus tropicalis tadpoles
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Researchers studied how the flame retardant TBBPA is distributed within and released from polystyrene microplastics, and tested the combined toxicity on tadpoles. They found a trade-off where microplastics that encapsulated the chemical reduced its immediate toxicity but created a slow-release exposure over time. The study highlights the complex relationship between microplastic-bound additives and their long-term effects on aquatic wildlife.
The toxicity of microplastics (MPs) to aquatic animals is closely related to the presence and release kinetics of contained additives, as most plastic products contain various additives. However, the relationship between the occurrence and release of additives from MPs, and their individual or combined toxicity remains unclear. In this study, the nanoscale distribution and release of tetrabromobisphenol A (TBBPA, a common flame retardant with endocrine-disrupting effect) in polystyrene (PS) MPs, and the long-term (60 days) toxicity of TBBPA and MPs containing TBBPA (at doses of 0 %, 1 %, 10 %, w/w) to Xenopus tropicalis tadpoles were investigated. Exposure to 10 μg/L TBBPA alone was the most toxics, while the encapsulation of TBBPA in MPs significantly delayed its lethal toxicity to tadpoles by inhibiting the rapid and extensive release of TBBPA. PS MPs alone and MPs containing 10 % TBBPA exhibited delayed survival toxicity compared to TBBPA alone, whereas PS MPs containing 1 % TBBPA did not show this effect but inhibited growth. These findings suggest that chronic toxicity assessments should be based on long-term (months or even years) exposure experiments due to the encapsulation-controlled slow release of toxic additives.
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Microplastics and plastic additives as contaminants of emerging concern: A multi-biomarker approach using Rhinella arenarum tadpoles
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Researchers exposed toad tadpoles to polyethylene microplastics and the flame retardant TBBPA, both alone and in combination, for 30 days. They found that the mixture produced different toxic effects than either substance alone, affecting growth, enzyme activity, and cellular stress markers. The study highlights the importance of studying microplastics alongside common plastic additives, since their combined effects may differ from individual exposures.
Association of tetrabromobisphenol A (TBBPA) with micro/nano-plastics: A review of recent findings on ecotoxicological and health impacts
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This review examines how tetrabromobisphenol A (TBBPA), a widely used flame retardant found in plastic products, binds to micro and nanoplastics in the environment. When TBBPA hitches a ride on microplastics, the combined effect on organisms and ecosystems is often worse than either contaminant alone. Since TBBPA is an additive in many plastic products, the findings highlight how microplastics can carry harmful chemicals directly into the body.
Adsorption behaviors and bioavailability of tetrabromobisphenol A in the presence of polystyrene microplastic in soil: Effect of microplastics aging
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Researchers studied how aging changes the ability of polystyrene microplastics to absorb and release a flame retardant chemical called TBBPA in soil. They found that aged microplastics had a greater capacity to adsorb the chemical but also released it more readily, increasing the bioavailability of this toxic compound to soil organisms. The study reveals that as microplastics weather in the environment, they may actually become more effective carriers of harmful chemicals into the food chain.
Enhanced adsorption of tetrabromobisphenol a (TBBPA) on cosmetic-derived plastic microbeads and combined effects on zebrafish
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Scientists investigated how cosmetic microbeads adsorb the flame retardant TBBPA and then tested the combined effect on zebrafish, finding that microbeads enhanced TBBPA bioavailability and caused greater developmental toxicity and endocrine disruption than TBBPA exposure alone.
The contribution of polymer additives to microplastic toxicity: A long-term study with Oncorhynchus mykiss exposed to polystyrene microparticles with different hexabromocyclododecane content
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Scientists fed rainbow trout microplastics mixed with a common flame retardant chemical (HBCD) and found the combo caused more liver damage, inflammation, and hormone disruption than either one alone — even though the chemical itself didn't build up much in the fish's body. This suggests plastic particles can act like tiny delivery trucks, making the chemicals attached to them more harmful than expected, which matters because these same flame retardants are found in everyday products and environments where humans are also exposed to microplastics.
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