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61,005 resultsShowing papers similar to Investigating the toxicities of different functionalized polystyrene nanoplastics on Daphnia magna
ClearPolystyrene Nanoplastic Behavior and Toxicity on Crustacean Daphnia magna: Media Composition, Size, and Surface Charge Effects
Researchers examined how size and surface charge of polystyrene nanoplastics (20-100 nm) affected their behavior and toxicity to Daphnia magna in different water media, finding that smaller particles and certain media compositions significantly increased toxicity and aggregation patterns.
Controlled protein mediated aggregation of polystyrene nanoplastics does not reduce toxicity towards Daphnia magna
Researchers found that protein-mediated aggregation of polystyrene nanoplastics into larger clusters did not reduce their toxicity to Daphnia magna, whereas solid particles of equivalent aggregate size were non-toxic, suggesting aggregation state alone does not determine nanoplastic hazard.
Aquatic behavior and toxicity of polystyrene nanoplastic particles with different functional groups: Complex roles of pH, dissolved organic carbon and divalent cations
Researchers systematically examined how water chemistry — pH, dissolved organic carbon, and divalent calcium and magnesium ions — affects the stability, aggregation, and toxicity of polystyrene nanoplastics with different surface functional groups, finding that complex solution conditions enhanced aggregation through cation bridging and increased oxidative gut damage in Daphnia magna.
Potential for high toxicity of polystyrene nanoplastics to the European Daphnia longispina
Researchers exposed water fleas (Daphnia) to polystyrene nanoplastics and found that 50 nm particles were thousands of times more toxic per unit mass than 100 nm particles, with effects comparable to highly regulated toxic chemicals. The results highlight how particle size dramatically changes nanoplastic hazard and challenge the assumption that microplastics pose low ecological risk.
Acute toxicity of nanoplastics on Daphnia and Gammarus neonates: Effects of surface charge, heteroaggregation, and water properties
Researchers examined nanoplastic toxicity on crustacean neonates and found that smaller particles (20-40 nm) were more toxic, with surface charge and aggregation behavior being the primary factors influencing toxicity depending on species and water conditions.
Ecotoxicological Effects of Nanoplastic and Microplastic Polystyrene Particles on Hyalella azteca: A Comprehensive Study on the Impact of Physical and Chemical Surface Properties
Researchers studied the ecotoxicological effects of polystyrene nano- and microplastics on the freshwater crustacean Hyalella azteca through short- and long-term exposure experiments. The study found that surface properties and functional group modifications of the particles were key determinants of toxicity, with amino-functionalized microplastics and fluorescent nanoplastics showing significant effects on oxidative stress biomarkers and organism development, while unmodified nanoplastics were nearly inert.
Effect of salinity and humic acid on the aggregation and toxicity of polystyrene nanoplastics with different functional groups and charges
Researchers showed that surface charge governs nanoplastic behavior in water — higher salinity caused negatively charged nanoplastics to aggregate while positively charged particles remained stable — and that humic acid (dissolved organic matter) alleviated toxicity to Daphnia, increasing survival from 15% to nearly 100% in some cases.
Potential for high toxicity of polystyrene nanoplastics to the European Daphnia longispina
Researchers found that polystyrene nanoplastics caused high toxicity in three genetically distinct clones of the European water flea Daphnia longispina, highlighting the ecological hazard of nanoplastics and the importance of reporting exposure in particle count rather than mass metrics.
Molecular, biochemical and behavioral responses of Daphnia magna under long-term exposure to polystyrene nanoplastics
Researchers studied the long-term effects of polystyrene nanoplastics on the water flea Daphnia magna over a 21-day exposure period at environmentally relevant concentrations. The study found molecular, biochemical, and behavioral changes even at low concentrations, suggesting that chronic exposure to nanoplastics may have significant impacts on aquatic organisms that short-term studies might miss.
Quantification of the combined toxic effect of polychlorinated biphenyls and nano-sized polystyrene on Daphnia magna
Researchers investigated how nano-sized polystyrene particles modify the acute toxicity of polychlorinated biphenyls (PCBs) to Daphnia magna, finding that low concentrations of nanoplastics reduced PCB toxicity by binding and sequestering the chemicals, while high nanoplastic concentrations became directly lethal, reversing the protective effect.
Metabolomics-based analysis in Daphnia magna after exposure to low environmental concentrations of polystyrene nanoparticles
Daphnia magna exposed to low environmental concentrations of polystyrene nanoplastics (as low as 3.2 micrograms per liter) showed significant metabolic disruptions detectable by metabolomics analysis. Carboxylate-functionalized particles caused distinct metabolic responses compared to amine-functionalized particles, suggesting surface chemistry drives differential toxicity.
Ecotoxicity of Heteroaggregates of Polystyrene Nanospheres in Chironomidae and Amphibian
Researchers examined the ecotoxicity of carboxylated polystyrene nanospheres (350 nm and 50 nm) and their heteroaggregates on freshwater Chironomidae larvae and amphibians, using exposure experiments to assess toxicity mechanisms in organisms with direct environmental contact with plastic-polluted freshwater. They found that heteroaggregation altered the bioavailability and toxicity profiles of the nanoplastics compared to pristine particles, with effects including developmental disruption and behavioral changes in exposed organisms.
Sub-lethal effects of nanoplastics upon chronic exposure to daphnia magna
Researchers conducted 21-day chronic exposures of Daphnia magna to 20 nm and 200 nm carboxylated polystyrene nanoplastics at 50 mg/L and 0.1 mg/L, finding sub-lethal effects on growth, molting, and reproduction at all tested concentrations and both size classes, with results supporting particle number as a relevant dose metric.
What Is on the Outside Matters—Surface Charge and Dissolve Organic Matter Association Affect the Toxicity and Physiological Mode of Action of Polystyrene Nanoplastics toC. elegans
Researchers investigated how surface charge and organic matter coatings affect the toxicity of polystyrene nanoplastics to the nematode C. elegans. Positively charged nanoplastics were over 60 times more toxic than negatively charged ones, and organic matter coatings reduced toxicity across all particle types. The findings suggest that surface chemistry plays a critical role in nanoplastic toxicity and should be considered when assessing environmental risks.
Polystyrene nanoplastic exposure induces immobilization, reproduction, and stress defense in the freshwater cladoceran Daphnia pulex
Researchers documented how polystyrene nanoplastics accumulate in the guts of the freshwater crustacean Daphnia pulex and cause chronic toxicity at environmentally relevant concentrations, delaying reproduction, reducing offspring numbers, and inducing then suppressing antioxidant defense genes over a 21-day exposure.
Influence of nanoplastic surface charge on eco-corona formation, aggregation and toxicity to freshwater zooplankton
Researchers examined how surface charge and natural organic matter influence the stability and toxicity of polystyrene nanoplastics to freshwater zooplankton. They found that positively charged nanoplastics were significantly more toxic than negatively charged ones, and that natural organic matter formed an eco-corona on the particles that reduced their toxicity. The study highlights that both particle surface properties and environmental conditions play critical roles in determining nanoplastic impacts on aquatic organisms.
Assessing the acute differential toxicity of polystyrene microplastic particles and comparing the impacts of bead-shaped versus fragmented particles on Daphnia magna
Researchers compared the toxicity of polystyrene microplastic fragments versus beads on tiny freshwater crustaceans (Daphnia magna) and found that jagged fragments were more harmful than smooth beads, causing greater mortality and triggering more stress-related genes — suggesting that the shape of a microplastic particle matters as much as its chemical makeup.
Protein binding on acutely toxic and non-toxic polystyrene nanoparticles during filtration by Daphnia magna
Researchers investigated protein binding on acutely toxic versus non-toxic polystyrene nanoparticles during filtration by Daphnia magna zooplankton, finding that the two particle types bind different protein profiles, suggesting that surface protein corona composition may help explain differential toxicity outcomes.
Quantifying nanoplastic-bound chemicals accumulated in Daphnia magna with a passive dosing method
A passive dosing method was used to measure how chemicals accumulate in Daphnia water fleas when nanoplastics are present, helping separate direct particle effects from chemical effects. Understanding which pathway causes more harm is essential for accurately assessing nanoplastic risk.
Emerging trends in nanoparticle toxicity and the significance of using Daphnia as a model organism
Researchers reviewed why the freshwater crustacean Daphnia is a valuable model organism for nanoparticle toxicity testing, summarizing how nanoparticle size, charge, and surface chemistry influence toxicity in Daphnia and highlighting key knowledge gaps in nanoplastic environmental risk assessment.
Impact of polystyrene nanoplastics on early life stages of marine invertebrates: current knowledge and future research perspectives
This review synthesizes knowledge on how polystyrene nanoparticles affect the early life stages of marine invertebrates across five phyla, finding that toxicity depends heavily on surface charge, with amino-modified particles being most harmful to embryos and larvae.
Secreted protein eco-corona mediates uptake and impacts of polystyrene nanoparticles on Daphnia magna
Researchers discovered that proteins secreted by Daphnia magna create an eco-corona around polystyrene nanoparticles, increasing their uptake and toxicity. The study found that this protein coating also made the nanoparticles harder to remove from the gut, demonstrating a previously unknown biological mechanism that enhances the harmful effects of nanoplastics on this important indicator species.
Distinctive toxic repercussions of polystyrene nano plastic towards aquatic non target species Nitrobacter vulgaris, Scenedesmus sp and Daphnia magna
Researchers tested polystyrene nanoplastics across a wide concentration range against three aquatic species and found dose-dependent toxicity in all three — inhibiting nitrifying bacteria growth, reducing algal protein and chlorophyll, and killing water fleas — revealing broad ecological hazard across trophic levels.
Combined Toxicity of Polystyrene Nanoplastics and Pyriproxyfen to Daphnia magna
Researchers evaluated the combined toxic effects of polystyrene nanoplastics and the insecticide pyriproxyfen on the water flea Daphnia magna under both acute and chronic exposure conditions. They found that nanoplastics initially reduced the acute toxicity of the pesticide within 24 hours but worsened chronic effects over longer periods. The study suggests that nanoplastics can alter how other environmental contaminants affect aquatic organisms, complicating risk assessments.