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Aging-induced surface modifications in biodegradable microplastics and their influence on antibiotic interactions
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Adsorption behaviors and mechanisms of azithromycin on degradable and non-degradable microplastics aged with UV/sodium percarbonate
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Scientists found that when microplastics (both regular plastic and "eco-friendly" biodegradable plastic) get weathered by sunlight and cleaning chemicals used in wastewater treatment, their surfaces become rougher and chemically altered, making them up to 4 times better at soaking up azithromycin, a common antibiotic that surged in use during COVID-19. This matters because these antibiotic-loaded microplastics could act as carriers, potentially transporting drugs through water systems and the environment in ways that aren't fully understood yet, including possibly contributing to antibiotic resistance or human exposure down the line.
The Sorption of Amoxicillin on Engineered Polyethylene Terephthalate Microplastics
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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.
Impacts of Biofilm Formation on the Physicochemical Properties and Toxicity of Microplastics: A Concise Review
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Researchers reviewing biofilm formation on microplastics found that microbial colonization alters the particles' surface chemistry, density, and pollutant adsorption capacity, ultimately affecting how microplastics are ingested by organisms and how they influence nutrient cycling in aquatic ecosystems.
Effects of biofilm modification on polyethylene microplastics-associated sulfamethazine adsorption
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A 28-day study found that biofilm colonization on polyethylene microplastics increased their adsorption of the antibiotic sulfamethazine by 2–2.6-fold, driven by hydrogen bonding, electrostatic, and CH/π interactions. This demonstrates that microplastics in aquatic environments become more dangerous over time as biofilms form on their surfaces, amplifying their ability to accumulate and transport harmful pollutants through ecosystems.
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