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Cited by 174

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Rapid Physicochemical Changes in Microplastic Induced by Biofilm Formation

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McGivney, Eric, Cederholm, Linnea, Barth, Andreas, Hakkarainen, Minna, Hamacher-Barth, Evelyne, Ogonowski, Martin, Gorokhova, Elena·2020·Frontiers in Bioengineering and Biotechnology
DOI 10.3389/fbioe.2020.00205
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Abstract

Risk assessment of microplastic (MP) pollution requires understanding biodegradation processes and related changes in polymer properties. In the environment, there are two-way interactions between the MP properties and biofilm communities: (i) microorganisms may prefer some surfaces, and (ii) MP surface properties change during the colonization and weathering. In a two-week experiment, we studied these interactions using three model plastic beads (polyethylene [PE], polypropylene [PP], and polystyrene [PS]) exposed to ambient bacterioplankton assemblage from the Baltic Sea; the control beads were exposed to bacteria-free water. For each polymer, the physicochemical properties (compression, crystallinity, surface chemistry, hydrophobicity, and surface topography) were compared before and after exposure under controlled laboratory conditions. Furthermore, we characterized the bacterial communities on the MP surfaces using 16S rRNA gene sequencing and correlated community diversity indices to the physicochemical properties of the MP. Significant changes in PE crystallinity, PP stiffness, and PS maximum compression were observed as a result of exposure to bacteria. Moreover, there were significant correlations between bacterial diversity and some physicochemical characteristics (crystallinity, stiffness, and surface roughness). These changes coincided with variation in the relative abundance of unique OTUs, mostly related to the PE samples having significantly higher contribution of Sphingobium, Novosphingobium and uncultured Planctomycetaceae compared to the other test materials, whereas PP and PS samples had significantly higher abundance of Sphingobacteriales and Alphaproteobacteria, indicating possible involvement of these taxa in the initial biodegradation steps. Our findings demonstrate measurable signs of MP weathering under short-term exposure to environmentally relevant microbial communities at conditions resembling those in the water column. A systematic approach for the characterization of the biodegrading capacity in different systems will improve the risk assessment of plastic litter in aquatic environments.

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Metadata

Authors
McGivney, E., Cederholm, L., Barth, A., Hakkarainen, M., Hamacher-Barth, E., Ogonowski, M., & Gorokhova, E.
Venue
Frontiers in Bioengineering and Biotechnology
Publisher
Frontiers Media SA
Published
2020-03-20
Volume
8
Pages
205-205
ISSN
2296-4185 (ISSN-L)
DOI
10.3389/fbioe.2020.00205
OpenAlex
W3011932438
Cited by
174
References
8
FWCI
5.18
Type
journal article
Language
en
Open access
gold
Licence
creativecommons.org/licenses/by/4.0/ (vor)

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McGivney, E., Cederholm, L., Barth, A., Hakkarainen, M., Hamacher-Barth, E., Ogonowski, M., & Gorokhova, E. (2020). Rapid Physicochemical Changes in Microplastic Induced by Biofilm Formation. Frontiers in Bioengineering and Biotechnology. https://doi.org/10.3389/fbioe.2020.00205

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