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Ecotoxicity of polylactic acid microplastic fragments to Daphnia magna and the effect of ultraviolet weathering
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Scientists compared the toxicity of biodegradable PLA (polylactic acid) microplastics with conventional polyethylene microplastics on water fleas, a key species in aquatic food chains. The biodegradable PLA microplastics were actually more acutely toxic than conventional ones, partly because their higher density led to greater accumulation in the organisms. UV weathering further increased the toxicity of PLA microplastics, challenging the assumption that biodegradable plastics are automatically safer for the environment.
Biodegradable plastics (BPs) are widely used as alternatives to non-BPs due to their inherent ability to undergo facile degradation. However, the ecotoxicological impact of biodegradable microplastics (MPs) rarely remains scientific documented especially to aquatic ecosystem and organisms compared to conventional microplastics. Therefore, this study aimed to investigate the ecotoxicity of biodegradable polylactic acid (PLA) MPs to Daphnia magna with that of conventional polyethylene (PE) MPs with and without ultraviolet (UV) treatment (4 weeks). The acute toxicity (48 h) of PLA MPs was significantly higher than that of PE MPs, potentially attributable to their elevated bioconcentration resulting from their higher density. UV treatment notably reduced the particle size of PLA MPs and induced new hydrophilic functional groups containing oxygen. Thus, the acute lethal toxicity of PLA MPs exhibited noteworthy increase, compared to before UV treatment after UV treatment, which was greater than that of UV-PE MPs. In addition, UV-PLA MPs showed markedly elevated reactive oxygen species concentration in D. magna compared to positive control. However, there was no significant increase in the level of lipid peroxidation, possibly due to successful defense by antioxidant enzymes (superoxide dismutase and catalase). These findings highlight the ecotoxicological risks of biodegradable MPs to aquatic organisms, which require comprehensive long-term studies.
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Chronic toxicity of biodegradable microplastic (Polylactic acid) to Daphnia magna: A comparison with polyethylene terephthalate
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Scientists compared the toxicity of biodegradable PLA microplastics with conventional PET microplastics on water fleas and found that PLA was actually more harmful. At higher concentrations, PLA microplastics killed nearly half the organisms, reduced reproduction, and increased birth defects more than PET particles did. This challenges the assumption that biodegradable plastics are safer for the environment, suggesting they may pose similar or even greater ecological risks than conventional plastics.
A comparison between the effects of polylactic acid and polystyrene microplastics on Daphnia magna
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This study compared the effects of polylactic acid (a biodegradable plastic) versus polystyrene microplastics on Daphnia magna water fleas, finding differences in toxicity that are important for understanding whether "biodegradable" plastics pose lower ecological risks than conventional plastics.
Toxicity comparison of polylactic acid and polyethylene microplastics co-exposed with methylmercury on Daphnia magna
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Researchers compared the toxicity of biodegradable polylactic acid microplastics with conventional polyethylene microplastics, both alone and in combination with methylmercury, on water fleas. The biodegradable microplastics caused greater harm, significantly reducing survival and reproduction while also increasing mercury accumulation in the organisms. The findings challenge the assumption that biodegradable plastics are always safer for the environment, suggesting they may actually enhance the toxicity of co-occurring pollutants.
Multi-level toxicity assessment of polylactic acid (PLA) microplastics on the cladoceran Daphnia magna
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Researchers tested the toxicity of microplastics made from polylactic acid (PLA), a common bioplastic marketed as an eco-friendly alternative, on water fleas over 21 days. The PLA microplastics caused oxidative stress, depleted energy reserves, and reduced reproduction, though effects were generally milder than those reported for conventional plastics. This study challenges the assumption that bioplastics are harmless once they break down in the environment.
Increased adsorption of diflubenzuron onto polylactic acid microplastics after ultraviolet weathering can increase acute toxicity in the water flea (Daphnia magna)
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Researchers found that UV-weathered biodegradable polylactic acid microplastics absorbed significantly more of the pesticide diflubenzuron than conventional PET microplastics, leading to greater toxicity in water fleas. The weathering process created more surface cracks and functional groups on the biodegradable plastic, increasing its ability to carry harmful chemicals. The study challenges the perception that biodegradable plastics are inherently safer, showing they may actually enhance pesticide toxicity in aquatic environments after environmental aging.
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