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Effect of polystyrene microplastic and chlorpyrifos pesticide on superoxide dismutase activity in tissues of rainbow trout (Oncorhynchus mykiss)
Summary
Rainbow trout were exposed to polystyrene microplastics, the pesticide chlorpyrifos, and a combination of both, with researchers measuring effects on antioxidant enzyme activity. The combined exposure caused greater disruption to superoxide dismutase activity than either pollutant alone, suggesting microplastics can amplify pesticide toxicity in fish.
Microplastics are particles smaller than 5 mm that can enter to the environment through primary or secondary sources. These particles can be vector for various chemical compounds in the environment, such as pesticides and pollutants. The absorption of these particles into the body of organisms, especially aquatic organisms, causes changes in the activity of their enzymes, especially antioxidant enzymes. The aim of our study was to investigate the effect of polystyrene microplastic and chlorpyrifos pesticide alone and in combination on the superoxide dismutase (SOD) activity tissues of rainbow trout (Oncorhynchus mykiss). Fish were exposed to two concentrations of chlorpyrifos (2 μg / L, 6 μg / L), polystyrene microplastic (30 μg / L, 300 μg / L), and their combination. Then the superoxide dismutase activity was examined in the liver, kidney and muscle tissues of fish. Analysis of the results with significance level of Pvalue μgL-1 MPs pesticide and in combination of 30 μg / L microplastic and 2 μgL-1CPFpesticide enzyme activity was decreased. In general, it was concluded that microplastics in liver and kidney decrease the bioavailability of chlorpyrifos pesticide and in muscle increases the toxicity and bioavailability of pesticides.
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