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Mechanism of Norfloxacin Transformation by Horseradish Peroxidase and Various Redox Mediated by Humic Acid and Microplastics
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Researchers chemically aged three types of microplastics—biodegradable PLA, PET, and polypropylene—and found that aging significantly increased their capacity to adsorb norfloxacin antibiotic, with aged PLA showing the greatest enhancement due to increased surface area and roughness. These results show that environmentally weathered microplastics act as more effective vectors for antibiotic transport in water systems, potentially worsening co-contamination risks for aquatic life and human health.
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Scientists found that when plastic bags (LDPE) break down in water treatment processes designed to remove pollutants, the resulting microplastic fragments actually become better at soaking up antibiotics like ofloxacin from water. This matters because these "weathered" microplastics could act like tiny sponges, ferrying antibiotics and other contaminants through our water systems and potentially into our bodies, meaning cleanup efforts might unintentionally make microplastic pollution more harmful rather than less.
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Researchers investigated how polypropylene, polyethylene, and polystyrene microplastics affect the formation of chlorinated disinfection byproducts (DBPs) when the antibiotic ciprofloxacin is chlorinated during water treatment, finding that microplastics had minimal effect on overall DBP generation. The study clarifies that while microplastics co-occur with antibiotics in treated water, they do not substantially amplify the formation of toxic chlorinated byproducts during disinfection — an important finding for drinking water safety assessment.
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Aged PET microplastics derived from beach-collected bottles adsorbed significantly more amoxicillin antibiotic than unaged lab-produced microplastics due to increased surface area and hydrogen bonding interactions between the antibiotic and polymer ester groups. These findings confirm that weathered microplastics act as vectors for antibiotic transport in aquatic environments, potentially spreading pharmaceutical contamination far from its original source.
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