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Biodistribution and elemental co-localisation of europium-doped nanoplastics in Daphnia magna revealed by synchrotron-based nanoprobe X-ray fluorescence imaging
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Scientists tracked tiny nanoplastic particles inside water fleas using powerful X-ray imaging and found the plastics build up in the gut and trigger stress signals in the body, even though the animals cleared them out fairly quickly. While this study is on tiny aquatic creatures, not humans, it helps researchers better understand how nanoplastics might interact with living tissue, a key step toward figuring out potential risks to human health.
Nanoplastic (NPl) particles are increasingly found in aquatic environments due to the long-term degradation of mismanaged plastic waste, and their uptake and accumulation in aquatic organisms are progressively reported. However, their biodistribution and spatial association with biologically relevant elements after ingestion remain poorly understood. In this study, europium-doped polystyrene NPls (Eu-doped NPls) were used as model particles to investigate their spatial distribution in Daphnia magna, a representative freshwater organism, using synchrotron-based nanoprobe X-ray fluorescence (nano-XRF). Daphnia magna neonates (<24 h old) were exposed to 5–20 mg L −1 Eu-doped NPls for 48 h and by using Eu as the tracer, their biodistribution was mapped using nano-XRF at multiple resolutions. No mortality was observed during exposure, although body length was significantly reduced relative to the control under all tested conditions ( p < 0.05). Reactive oxygen species (ROS)-associated fluorescence also increased significantly at 10 and 20 mg L −1 , indicating an organism-level oxidative-stress response at higher exposure concentrations. Toxicokinetic analysis revealed rapid uptake and efficient depuration, yielding a low bioconcentration factor (BCF = 0.982 L g −1 ). Two-dimensional nano-XRF maps showed that most Eu-associated signals were localised within gut-associated regions and spatially co-occurred with endogenous elements including Fe, Ca and K. Eu-derived signal metrics increased with external exposure concentration, with broader distribution at lower concentration and more pronounced hotspot formation at higher concentrations. ROI-based co-localisation analysis showed increasing spatial association between Eu and endogenous elements, particularly Fe, suggesting that Eu-associated signals were spatially structured within gut-associated elemental microenvironments rather than uniformly distributed. This study demonstrates that Eu-doped NPls combined with ICP-MS and synchrotron nano-XRF provide a complementary element-specific framework for linking quantitative body-burden analysis with spatially resolved biodistribution in aquatic organisms.
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Using a specially engineered nanoplastic particle visible under confocal Raman imaging, researchers tracked how nanoplastics move from the gut into other organs of the water flea Daphnia magna. The study revealed that nanoplastics can cross the intestinal barrier and translocate to other body parts, providing direct visual evidence of how these particles spread through a living organism and raising concerns about similar processes in other aquatic animals.
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Researchers used an advanced imaging technique called mass spectrometry imaging to track where microplastics accumulate inside water fleas after short-term exposure. They found that the tiny organisms ingested microplastics that concentrated in their gut, and the exposure altered their lipid metabolism. The technique offers a new way to visualize exactly where microplastics end up in small aquatic organisms and what biochemical changes they cause.
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Using gold-coated polystyrene nanoplastics as dual-function probes, researchers tracked how nanoplastics move through the body of the water flea Daphnia magna after ingestion, observing that particles initially accumulate in the intestine and then translocate to other organs within four hours at environmentally concerning concentrations. This direct visualization of inter-organ translocation in a key aquatic model organism strengthens concerns that nanoplastic pollution can spread beyond the gut and affect multiple body systems.
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Scientists studying nanoplastics (tiny plastic particles too small to see) usually track them in living organisms by tagging them with glowing dyes, but these dyes get lost in the body's own natural glow, making it hard to know exactly where the plastic ends up. In this study, researchers created a new type of glowing tag that uses special light-converting particles, and tested it in water fleas (a common lab organism), finding it showed up much more clearly in the gut than traditional dyes, without harming the animals. This matters because better tools to track where nanoplastics travel in living bodies could eventually help scientists understand how these particles move through the
Gold-labelled nanoplastics models: Synthesis, detection, and quantification by SP-ICP-MS in Daphnia magna
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Scientists have developed a clever new tool to track tiny plastic particles (nanoplastics) inside living organisms by attaching a microscopic gold marker to them, making even trace amounts detectable and measurable. Using this method on water fleas, they showed the tiny creatures absorbed more plastic the more they were exposed to, confirming these particles build up in the body over time. While this study was done in a small aquatic organism rather than humans, it's an important step toward better understanding how nanoplastics—found throughout our environment and food—accumulate in living things, which is crucial groundwork for future research into their health effects on people.
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