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Environmental Health and Safety Implications of the Interplay Between Microplastics and the Residing Biofilm
Summary
This review examines the two-way relationship between microplastics and biofilms, the communities of microorganisms that quickly colonize plastic surfaces in the environment. Biofilms on microplastics can harbor harmful bacteria, concentrate toxic chemicals, and help spread antibiotic resistance genes through water systems. Understanding this interplay is important for human health because these contaminated biofilm-coated microplastics can enter drinking water and food supplies.
The increasing prevalence of microplastics in the environment has raised concerns about their potential environmental and health implications. Biofilms readily colonize microplastics upon their entry into the environment, altering their surface characteristics. While most studies have explored how biofilms influence the adsorption and transportation of other contaminants by microplastics, the reciprocal interplay between microplastics and biofilms and the resulting ecological risks remain understudied. This review comprehensively reviews the impact of microplastic properties on biofilm formation and composition, including the microbial community structure. We then explore the dynamic interactions between microplastics and biofilms, examining how biofilms alter the physicochemical properties, migration, and deposition of microplastics. Furthermore, we emphasize the potential of biofilm-colonized microplastics to influence the environmental fate of other pollutants. Lastly, we discuss how biofilm-microplastic interactions may modify the bioavailability, biotoxicity, and potential health implications of microplastics.