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Incubation habitats and aging treatments affect the formation of biofilms on polypropylene microplastics
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Researchers studied how aging treatments and different aquatic habitats (marine, estuary, and river) affect biofilm formation on polypropylene microplastics. The study found that aging processes damaged the surface structure of microplastics and increased oxygen-containing groups, which enhanced microbial colonization. The results suggest that both environmental conditions and plastic degradation status significantly influence the microbial communities that form on microplastic surfaces.
Microbial colonization and biofilm formation associated with microplastics (MPs) have recently attracted wide attention. However, little is known about the effect of MP aging and different exposed habitats on biofilm formation and associated microbial community characteristics. To obtain a comprehensive understanding, virgin and aged polypropylene MPs were selected as attachment substrates and exposed to different aquatic habitats (marine, estuary, and river). The results showed that the aging process could destroy surface structure and increase oxygen-containing groups of MPs. The total biomass of the biofilms, attached-bacterial OTU numbers, and α diversities increased with exposure time. The biofilms biomass and α diversity of MPs in the river were significantly higher than those in the marine and estuary habitats, and temperature and salinity were primary factors affecting microbial colonization. Bacterial communities in MP-attached biofilms were significantly different from those in surrounding water. Microorganisms tend to adhere to aged MPs, and especially, genes related to human pathogens were significantly expressed on aged MPs, suggesting a potential ecological and health risk of aged MPs in aquatic ecosystems. Our results showed that aged MPs and different habitats have an important influence on microbial colonization, and the weathering process can accelerate biofilm formation on MPs.
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The Effects of Pristine and Aged Microplastics on Biofilm Formation and Antibiotic Production
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Researchers examined how pristine versus UV-light-aged polypropylene microplastics differentially affect biofilm formation and antibiotic production in microorganisms using a 96-well microplate assay, finding that surface aging alters the microbial colonization dynamics on microplastic surfaces. The study highlights the role of environmental weathering in changing how microplastics interact with microbial communities, with implications for the spread of antimicrobial resistance.
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This meta-analysis found that non-degradable microplastics — particularly PVC and polystyrene — support significantly more microbial colonization and biofilm formation than degradable plastics. Smaller particles were more conducive to colonization, and environmental factors like temperature, salinity, and exposure duration became increasingly important over time, with ocean microplastics forming biofilms more easily than those in lakes.
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