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Strategies for biofilm optimization of plastic-degrading microorganisms and isolating biofilm formers from plastic-contaminated environments
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This study investigated biofilm formation as a prerequisite for microbial plastic degradation, both optimizing biofilm formation in known plastic degraders and isolating novel biofilm formers from plastic-contaminated environments. Strategies to enhance surface colonization were evaluated as a practical step toward improving plastic biodegradation efficiency.
Abstract The perpetual disposal of plastic waste, combined with ineffective waste management strategies, has resulted in widespread environmental plastic pollution. Microbial plastic biodegradation represents an emerging solution to this problem. However, biodegradation studies tend to overlook the fundamental prerequisite of initial surface colonization via biofilm formation. This study had two independent but connected aims relating to plastic surface colonization by microorganisms: to enhance biofilm formation by known plastic degraders, with translational potential for improved plastic degradation, and to isolate microorganisms from microplastic contaminated environments with the ability to colonize plastic surfaces. Planktonic and biofilm responses to diverse carbon and energy sources were investigated over 7 days, using Bacillus subtilis 168, Fusarium solani (Martius) Saccardo, Ideonella sakaiensis 201-F6, Pseudomonas putida KT2440, and Rhodococcus ruber C208. This enabled optimal conditions for biofilm formation by each strain to be determined. In parallel, environmental samples containing synthetic or natural polymeric substances (anaerobic digestate, landfill leachate, and microplastic contaminated compost) were incubated with polyethylene and polyethylene terephthalate films, to isolate microorganisms capable of colonizing their surfaces. This yielded eight bacterial isolates from three genera: Bacillus, Lysinibacillus, and Proteus. These genera contain species that have been shown to degrade plastics and other recalcitrant synthetic polymers, demonstrating the success of our approach. This study also suggests that discrete plastic types may create different ecological niches which can be exploited by unique bacterial colonizers. Our findings underscore the importance of considering plastic colonization by microbial biofilms in the context of their biodegradation.
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Plastisphere community assemblage of aquatic environment: plastic-microbe interaction, role in degradation and characterization technologies
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This review examines the plastisphere—microbial communities colonizing plastic surfaces in aquatic environments—covering how these biofilms form, their role in plastic biodegradation, and current characterization technologies for studying plastic-microbe interactions.
Microbial Biofilm of Plastic in Tropical Marine Environment and their Potential for Bioremediation of Plastic Waste
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This review examined microbial biofilm communities on plastic debris in tropical marine environments, finding that warm, humid conditions accelerate plastisphere biofilm development, and that several identified bacterial taxa show potential for biodegradation of plastic polymers.
Direct evidence for selective microbial enrichment with plastic degradation potential in the plastisphere
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This study provided direct experimental evidence that microplastic surfaces selectively enrich bacteria capable of degrading plastic polymers, addressing the long-standing hypothesis that the plastisphere harbors plastic-degrading microbes. Bacteria isolated from microplastic biofilms demonstrably used plastic as a carbon source, confirming that environmental microplastics actively select for and concentrate plastic-degrading communities.
Promoting bacterial colonization and biofilm formation for enhanced biodegradation of low-density polyethylene microplastics
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Four bacterial strains isolated from marine plastic debris — including Bacillus cereus and Micrococcus luteus — were shown to form biofilms on low-density polyethylene and produce biosurfactants, with biofilm promotion strategies enhancing polyethylene biodegradation rates.
Biofilm development as a factor driving the degradation of plasticised marine microplastics
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Researchers investigated how natural marine biofilms drive the degradation of plasticized microplastics. The study found that biodegradation was dependent on polymer type, plasticizer type, and time, with polystyrene containing bisphenol A showing the most degradation, coinciding with increased abundance of putative biodegradative bacteria in the colonizing biofilm.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.