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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.
The increase in the usage of biodegradable microplastics (MPs) as an alternative to conventional plastics has necessitated comprehensive ecotoxicity assessments of biodegradable MPs alongside conventional MPs. This study aimed to assess ecotoxicity of biodegradable polylactic acid (PLA) MPs at concentration of 1 and 5 mgL including a genetic analysis of Daphnia magna, and compared to effects of conventional polyethylene terephthalate (PET) MPs. The survival rate for D. magna exposed to 5 mg L of PLA-MPs declined to 52.4 %, signifying a higher rate of mortality when contrasted with PET-MPs, which exhibited 85.7 % survival rate. Chronic exposure to 1 and 5 mgL PLA-MPs resulted in a decrease of offspring, while increasing the sex ratio and deformed embryo. Interestingly, down-regulation of the SOD and AK genes was observed in D. magna after exposure to 5 mgL of PLA-MPs, while 1 mgL of PLA-MPs up-regulated. These results means that 5 mgL PLA-MP could not produce energy and cope with oxidative stress, resulting in high mortality, and 1 mgL of MP was maintained survival due to energy production and antioxidant action. This study contributes to our understanding of biodegradable microplastics (BMPs) toxic effects on D. magna which could be similar to conventional MPs and provide the importance of ecotoxicological data for risk assessment of BMPs in aquatic organisms.
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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.
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.
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.
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.
Sublethal effects of bio-plastic microparticles and their components on the behaviour of Daphnia magna.
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This study compared the toxicity of bioplastic microparticles made from PLA and PHB to traditional fossil-based plastics on water fleas, a common test organism. Surprisingly, the bioplastic particles were about five times more toxic than their chemical additives alone, and commercial bioplastic products were more harmful than standard laboratory-grade materials. This challenges the assumption that biodegradable plastics are automatically safer for the environment and raises questions about what happens when bioplastics break down into microparticles.
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