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Additives in microplastics shape biofilm composition during aging and favour antibiotic-resistant microorganisms
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Microplastics often contain additives like UV filters and fillers, and this study found that these added chemicals change how quickly plastic breaks down in water and what kinds of microbes grow on its surface. Instead of helpful algae-like organisms, the plastic became coated with tougher bacteria, including some carrying antibiotic-resistance genes. This suggests that common plastic additives may not just affect how long microplastics stick around in the environment, but could also help breed drug-resistant bacteria, a growing concern for human health.
Plastic additives are emerging as active agents that shape the environmental impacts of microplastics. In this study, we investigated how a polyethylene microplastic formulation containing the commonly used UV filter benzophenone-3 (BP-3) and a calcium carbonate filler affects aging and biofilm colonization in freshwater. The additive-containing formulation altered the density and crystallinity of polyethylene particles and predisposed the material for faster surface transformation and formation of pits and cracks during aging. At the same time, it suppressed biofilm formation, reduced the development of extracellular polymeric substances by microorganisms, and specifically affected phototrophic microorganisms. Microbial community profiling revealed a shift from cyanobacteria-dominated biofilms to heterotrophic, chemically more resilient taxa, accompanied by enrichment of antibiotic resistance genes. Despite comparable genetic potential for polymer degradation, microbial activity was inhibited, indicating a trade-off between abiotic and biotic degradation. These results indicated that the tested additive-containing polyethylene formulation reduces microplastics stability and alters biofilm composition, highlighting the importance of considering additives in assessments of microplastic persistence and environmental effects.
More Papers Like This
Additives and biofilm formation on microplastics : insights from benzophenone-3 in polyethylene
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Researchers investigated how the UV-filter additive benzophenone-3 (BP-3) embedded in polyethylene microplastics affects biofilm formation and environmental aging in freshwater. BP-3-containing MPs developed different biofilm communities and aged differently compared to pristine MPs, demonstrating that additives significantly shape the environmental behavior of microplastics.
Effects of polymer type and aging on enrichment of antibiotic resistance genes and pathogens in biofilm on microplastics in biological wastewater treatment
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Tiny plastic particles in wastewater treatment plants act like magnets for bacteria, and this study found that the type of plastic and how much it's been broken down by sunlight both affect how much antibiotic-resistant bacteria build up on its surface. Plastics that break down more easily (like biodegradable PLA) and plastics that had been "aged" by UV light collected especially high levels of antibiotic resistance genes, meaning these microplastics could help spread drug-resistant germs back into our water and environment. This matters because it suggests not all plastics pose the same risk, and even "eco-friendly" biodegradable plast
Bisphenol A sorption on commercial polyvinyl chloride microplastics: Effects of UV-aging, biofilm colonization and additives on plastic behaviour in the environment.
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Researchers studied how UV aging and biofilm growth affect the ability of commercial PVC microplastics to adsorb and release bisphenol A, an endocrine-disrupting chemical. The study found that UV exposure and biofilm colonization generally increased adsorption capacity, but the effect varied depending on the plastic's additive composition, suggesting that commercial additives play an underappreciated role in how microplastics transport pollutants in the environment.
Influence of additives on long-term weathering of microplastic
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Researchers studied how chemical additives incorporated into plastic polymers during manufacturing affect how those plastics weather and degrade over extended periods in the environment. They found that certain additives accelerated degradation while others slowed it, with additive breakdown products themselves potentially posing environmental risks. The findings highlight that understanding the long-term fate of microplastics requires knowing not just the polymer type but also what additives were included.
Physicochemical behavior and ecological risk of biofilm-mediated microplastics in aquatic environments
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This review explores how biofilm formation on microplastics in water environments changes their physical and chemical behavior, potentially increasing their ecological risks. Researchers found that biofilm-coated microplastics more readily absorb pollutants and antibiotic resistance genes, and may disrupt gut microbiota in organisms that ingest them. The findings suggest that the biological aging of microplastics in nature makes them more dangerous than freshly produced particles.
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