Cited by 229Microplastics and Plastic PollutionMicrobial bioremediation and biosurfactantsbiodegradable polymer synthesis and properties

Critical evaluation of biodegradation studies on synthetic plastics through a systematic literature review

Matjašič, Tjaša, Simčič, Tatjana, Medvešček, Neja, Bajt, Oliver, Dreo, Tanja, Mori, Nataša·2021·Science of The Total Environment

Abstract

Increasing amounts of plastic waste in the environment and their fragmentation into smaller particles known as microplastics (particles, <5mm) have raised global concerns due to their persistency in the environment and their potential to act as vectors for harmful substances or pathogenic microorganisms. One possible solution to this problem is biodegradation of plastics by microorganisms. However, the scientific information on plastic-degrading microorganisms is scattered across different scientific publications. We conducted a systematic literature review (SLR) with predefined criteria using the online databases of Scopus and Web of Science to find papers on bacterial biodegradation of synthetic petroleum-based polymers. The aims of this SLR were to provide an updated list of all of the currently known bacteria claimed to biodegrade synthetic plastics, to determine and define the best methods to assess biodegradation, to critically evaluate the existing studies, and to propose directions for future research on polymer biodegradation in support of more rapid development of biodegradation technologies. Most of the bacteria identified here from the 145 reviewed papers belong to the phyla Proteobacteria, Firmicutes and Actinobacteria, and most were isolated from contaminated sites, such as landfill sites. Just under a half of the studies (44%) investigated the biodegradability of polyethylenes and derivates, particularly low-density polyethylenes. The methods used to monitor the biodegradation were mainly scanning electron microscopy and Fourier-transform infrared spectroscopy. We propose that: (1) future research should focus on biodegradation of microplastics arising from the most common pollutants (e.g. polyethylenes); (2) bacteria should be isolated from environments that are permanently contaminated with plastics; and (3) a combination of different observational methods should be used to confirm bacterial biodegradation of these plastics. Finally, when reporting, researchers need to follow standard protocols and include all essential information needed for repetition of the experiments by other research groups.

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Crossref · 10.1016/j.scitotenv.2020.141959

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163 of 163 references verified0 citation errors · 0 not checkable

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  • Several microbes have been found that seemingly degrade some plastic polymers directly, though it is debated if such metabolic traits exist in the marine environment and/or substantially contribute to plastic removal from the ocean.

    “Furthermore, several microbes were found that seemingly degrade some plastic polymers directly, 32,33 though it is at present debated if and in how far such metabolic traits exist in the marine environment and/or substantially contribute to plastic removal from the ocean environment.[34][35][36]”

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Authors
Matjašič, T., Simčič, T., Medvešček, N., Bajt, O., Dreo, T., & Mori, N.
Affiliations
  • Jožef Stefan International Postgraduate School (SI)
  • National Institute of Biology (SI)
Corresponding author
Matjašič, Tjaša
Venue
Science of The Total Environment
Publisher
Elsevier BV
Published
2021-01
Volume
752
Pages
141959
ISSN
0048-9697 (ISSN-L)
OpenAlex
W3082183116
Cited by
229
References
163
Citations by year
2026: 22 · 2025: 46 · 2024: 54 · 2023: 44 · 2022: 40 · 2021: 23
FWCI
1.20
Type
journal article
Language
en
Open access
closed
Locations
  • The Science of The Total Environment (publishedVersion)
  • PubMed (publishedVersion)
Funders
Javna Agencija za Raziskovalno Dejavnost RS (P1-0255, P1-0237, P4-0165, 51985)
Topics
  • Physical Sciences › Environmental Science › Pollution › Microplastics and Plastic Pollution
  • Physical Sciences › Environmental Science › Pollution › Microbial bioremediation and biosurfactants
  • Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
Keywords
plastic biodegradation, plastic-degrading bacteria, microplastics, polyethylene, low-density polyethylene, landfill contamination, Proteobacteria, Firmicutes, actinobacteria, reporting guidelines
MeSH terms
Microplastics, Biodegradation, Environmental, Petroleum, Plastics, Polymers

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