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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.
Bioplastics arise as an alternative to plastic production delinked from fossil resources. However, as their demand is increasing, there is a need to investigate their environmental fingerprint. Here we study the toxicity of microplastics (MPLs) of two widely used materials, the polylactic acid (PLA) and the polyhydroxybutyrate (PHB) on the environmental aquatic model species Daphnia magna. The study was focused on sublethal behavioural and feeding endpoints linked to antipredator scape responses and food intake. The study aimed to test that MPLs from single-use household comercial items and among them bioplastics should be more toxic than those obtained from standard plastic polymers and fossil plastic materials due to the greater amount of plastic additives, and that MPLs should be more toxic than plastic extracts due to the contribution of both particle and plastic additive toxicity. MPLs were obtained by cryogenic grinding and sea-sand erosion to obtain irregular particles. MPL included standard polymers and nine comercial items of PLA and PHB and one fossil-based material of high-density polyethylene (HDPE). The additive content in commercial items was characterised by liquid chromatography coupled with high-resolution mass spectrometry. D. magna juveniles were exposed for 24 h to particles and their plastic extracts. Results indicated that the toxicity of bioplastic particles was five times higher than the effects produced by exposure to the content of the additives alone, that bioplastic particles were more toxic than fossil ones and that particles obtained from commercial items were more toxic than those obtained from PLA, PHB or HDPE polymer standards. Predicted toxicity from the measured plastic additives in the studied commercially available household items, however, was poorly related with the observed behavioural and feeding effects. Further research on unknown chemical components together with physical factors is need it to fully understand the mechanisms of toxicity of bioplastic materials.
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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.
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.
The chronic effects of polyethylene terephthalate and biodegradable polyhydroxybutyrate microplastics on Daphnia magna
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Researchers compared the effects of conventional PET microplastics and biodegradable PHB microplastics on water fleas over 26 days. PET fibers and fragments caused significant harm, reducing swimming speed by 20% and survival to just 20%, while PHB particles showed no negative effects, with survival and mobility comparable to control groups. The findings suggest that biodegradable polymers like PHB could be a safer alternative to conventional plastics for reducing harm to aquatic organisms.
Biochemical and behavioral effects induced by conventional and bio-degradable plastics towards the cladoceran Daphnia magna
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Researchers exposed Daphnia magna to PET and PLA microplastics at three concentrations over 21 days, assessing biochemical endpoints including oxidative stress markers, antioxidant enzymes, lipid peroxidation, energy reserves, and swimming behavior. Both fossil-based PET and biobased PLA microplastics induced measurable stress responses at sub-individual and individual levels, demonstrating that bioplastics do not necessarily present a safer environmental profile than conventional polymers.
What are the drivers of microplastic toxicity? Comparing the toxicity of plastic chemicals and particles to Daphnia magna
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Researchers exposed water fleas to three types of microplastics -- PVC, polyurethane, and polylactic acid (a biodegradable plastic) -- to determine whether toxicity comes primarily from the particles themselves or from their chemical additives. They found that all three types harmed the organisms, but the drivers of toxicity varied by plastic type, with PVC toxicity linked to its chemical additives while polylactic acid reduced survival through particle effects. Notably, the study suggests that bio-based and biodegradable plastics can be just as toxic as conventional ones.
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