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Submicron-size-dependent toxicity of microplastic–antibiotic mixtures in Chlorella pyrenoidosa
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Scientists found that tiny plastic particles (smaller than a speck of dust) can team up with antibiotics in water to harm algae, the tiny organisms at the base of the food chain, and that the plastic's exact size and surface coating change how toxic the mixture becomes. Interestingly, when plastics and antibiotics mixed together, the combo was often less harmful than antibiotics alone, because the plastic particles soaked up some of the antibiotic. This matters because it shows that studying pollutants one at a time doesn't capture the full picture, real-world mixtures of microplastics and drugs in our water systems behave differently
As an emerging contaminant, the co-presence of microplastics (MPs) of multiple sizes can exacerbate ecological risks. This study investigated the individual and combined toxicity of three-sized MPs (0.2, 0.3, 0.4 μm) and three macrolide antibiotics on Chlorella pyrenoidosa. In a single exposure scenario, 0.4 μm polystyrene (PS) and carboxyl-modified polystyrene (CPS) demonstrated greater toxicity than the 0.2 μm size, while amino-modified polystyrene (APS) showed an inverse size-dependent effect. At environmentally relevant concentrations (0.0005-0.001 mg/L), most particle-size-related differences in growth inhibition were small and statistically nonsignificant. More pronounced but non-monotonic size effects emerged at 1 mg L-1 and varied with MP type and exposure duration. Notably, 0.4 μm MPs significantly suppressed superoxide dismutase activity, and the correlation between total antioxidant capacity and malondialdehyde shifted from negative to positive at high concentrations, indicating antioxidant defense failure. Binary growth inhibition was strongly dependent on antibiotic identity, MP type, particle size, and exposure concentration. Short-term exposure (96 hr) at high levels of MPs showed toxicity order: 0.4 μm > 0.2 μm > 0.3 μm, though differences diminished over time. Compared to antibiotics alone, MP-antibiotic mixtures generally showed reduced toxicity due to MP adsorption lowering bioavailable antibiotic concentrations. The 0.3-0.4 μm APS combination increased chlorophyll a inhibition by 59.3% compared to the 0.2-0.3 μm group, attributed to enhanced sedimentation and interfacial contact affecting photosynthesis. This study elucidates how MP particle size dictates the evolution of combined toxicity by concurrently regulating sedimentation, adsorption, and pollutant slow-release kinetics, providing a critical new perspective for assessing the risks of MP-antibiotic co-pollution in realistic environments.
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Response of Chlorella sorokiniana to Co-Exposure to Sulfamethoxazole and Polystyrene Microplastics: Toxicity Effect, Defense and Biodegradation Mechanism
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Scientists found that when a common antibiotic (sulfamethoxazole) and microplastic particles pollute water together, algae actually break down the antibiotic more effectively than when the antibiotic is alone—and the leftover breakdown products are less toxic than the original antibiotic. This matters because it suggests some algae in rivers and lakes could help naturally clean up antibiotic pollution even in microplastic-contaminated water, potentially reducing the spread of drug residues that can affect ecosystems and, indirectly, the water humans rely on.
Size-dependent effect of microplastics on toxicity and fate of diclofenac in two algae
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This study investigated how different sizes of polystyrene microplastics affect two species of algae and interact with the common pharmaceutical pollutant diclofenac. Researchers found that the smallest microplastics caused the most significant growth inhibition in algae, and the combined presence of microplastics and diclofenac could alter how each pollutant behaves. The findings underscore how microplastics can change the toxicity and environmental fate of other water contaminants.
When antibiotics encounter microplastics in aquatic environments: Interaction, combined toxicity, and risk assessments
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A meta-analysis of the combined toxicity of antibiotics and microplastics in aquatic environments found significant adverse effects on algae but limited apparent effects on fish and daphnia. Microplastics alter antibiotic environmental behavior through adsorption and co-transport, and their coexistence is widespread across global aquatic study sites, though standardized risk assessment methods for combined exposure remain lacking.
Interactive toxicity effects of metronidazole, diclofenac, ibuprofen, and differently functionalized nanoplastics on marine algae Chlorella sp.
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Researchers examined the combined toxicity of common pharmaceutical drugs and nanoplastics with different surface coatings on marine algae. They found that the interaction between drugs and nanoplastics produced effects ranging from additive to synergistic, depending on the specific combination, with amine-coated nanoplastics generally causing more harm. The study highlights that real-world mixtures of pharmaceutical and plastic pollutants in oceans may pose greater risks to marine life than either contaminant alone.
Higher toxicity induced by co-exposure of polystyrene microplastics and chloramphenicol to Microcystis aeruginosa: Experimental study and molecular dynamics simulation
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Researchers studied what happens when the antibiotic chloramphenicol and polystyrene microplastics are present together in water containing blue-green algae. The study found that the combined exposure was more toxic to the algae than either pollutant alone, disrupting photosynthesis and gene expression. The findings suggest that microplastics and antibiotics may interact in ways that amplify their harmful effects on aquatic ecosystems.
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