4.7 Review

Review of microplastic degradation: Understanding metagenomic approaches for microplastic degrading organisms

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Biodegradation of microplastics: Better late than never

Saba Miri et al.

Summary: Plastic use is expanding, especially in the form of microplastics, which are posing a global threat to ecosystems and human health. Current research focuses on biotechnological methods for removing microplastics, but further studies are needed to develop more effective strategies.

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Insights into polyester plastic biodegradation by carboxyl ester hydrolases

Alisa Gricajeva et al.

Summary: Researchers have been using various microbial enzymes to degrade polyester plastics, which can effectively reduce the levels of plastics in the environment. Progress is being made in protein engineering to develop more effective and suitable polyester-degrading lipolytic biocatalysts.

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Microplastics, both non-biodegradable and biodegradable, do not affect the whole organism functioning of a marine mussel

Patrick W. S. Joyce et al.

Summary: Microplastics are common in the marine environment and their impact on organisms is still unclear. Many experimental studies use much higher concentrations of microplastics than what is found in natural ecosystems. This study exposed Asian green mussels to biodegradable and non-biodegradable microplastics at environmentally relevant concentrations and found no significant effects on their survival, metabolism, and other indicators. Future research should focus on environmentally relevant microplastic concentrations.

SCIENCE OF THE TOTAL ENVIRONMENT (2022)

Article Chemistry, Multidisciplinary

Risk for the release of an enormous amount of nanoplastics and microplastics from partially biodegradable polymer blends

Xin-Feng Wei et al.

Summary: The presence of nanoplastics and microplastics in natural environments is a global concern. This study reveals the risk of significant emissions of these particles from partially biodegradable polymer blends. The findings emphasize the importance of avoiding the use of non-biodegradable polymers in blends.

GREEN CHEMISTRY (2022)

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Microplastics in Aquatic Environments: Sources, Ecotoxicity, Detection & Remediation

Yasharth Katare et al.

Summary: Microplastic pollutants pose a significant threat to aquatic environments and human health. They accumulate in various aquatic systems and enter the food chain, causing adverse effects on ecosystems. This study discusses the occurrence and release of microplastics, their impact on human health and aquatic life, as well as methods to remove them from water systems.

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Toxicities of microplastic fibers and granules on the development of zebrafish embryos and their combined effects with cadmium

Haodong Cheng et al.

Summary: The study compared the effects of granular and fibrous microplastics on the development of zebrafish embryos, and found that both types of microplastics reduced the toxicity of cadmium on the embryos. The detoxification effect of fibrous microplastics was more significant.

CHEMOSPHERE (2021)

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Microplastics and associated contaminants in the aquatic environment: A review on their ecotoxicological effects, trophic transfer, and potential impacts to human health

Wei Huang et al.

Summary: Microplastic pollution and its ecological impacts in aquatic environments have become a global concern in the past decade. Microplastics can affect aquatic organisms through food chain transfer and pose potential risks to human health.

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The effect of sewage sludge containing microplastics on growth and fruit development of tomato plants

Ricardo Hernandez-Arenas et al.

Summary: This study focused on the microplastics in sewage sludge and found that microplastics have certain effects on the growth of tomato plants and fruit production. Further research is needed to validate these findings and explain the potential mechanisms of impact.

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Characterization and environmental impacts of microplastics

Hao Du et al.

Summary: This paper systematically reviewed the analysis methods of microplastics, including physical and chemical characterization. It analyzed and compared the characteristics, application range, and pros and cons of each method, while also addressing the current research gaps and proposing future research recommendations. The study focused mainly on microplastics in aquatic environments, highlighting the need for further research in other environmental compartments.

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Degradation of a Main Plastic Pollutant Polyethylene Terephthalate by Two Distinct Proteases (Neprilysin and Cutinase-like Enzyme)

Qiaoyu Hu et al.

Summary: In this study, the hydrolysis of PET by two different enzymes, NEP and CLE, was investigated. It was found that NEP utilizes the MH mechanism as energetically most favorable, while CLE catalyzes the reaction with a higher barrier. These findings suggest that metal-based catalysts may be more effective for PET degradation.

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Human exposure to microplastics: A study in Iran

Sajjad Abbasi et al.

Summary: The study quantitatively assessed the exposure of microplastics to adults from different regions of Iran. It found that the highest amount of microplastics were retrieved from head hair, while the lowest were from saliva. Males were exposed to about twice as much microplastics as females. The most abundant type of microplastics found in all body receptors were polyethylene-polyethylene terephthalate and polypropylene fibres of < 100 μm in length.

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Microplastics pollution in the Brahmaputra River and the Indus River of the Indian Himalaya

Tenzin Tsering et al.

Summary: This study investigated microplastics pollution in river shore sediment of the Indian Himalaya, highlighting the abundance of small-sized microplastics and the dominance of fragmented, secondary microplastics in the sediments. The study contributes to filling the research gap on microplastics in India's freshwater sources and emphasizes the importance of comprehensive studies on microplastics in rivers that serve as pathways and sinks for these pollutants.

SCIENCE OF THE TOTAL ENVIRONMENT (2021)

Review Environmental Sciences

Plastic biodegradation: Frontline microbes and their enzymes

Ayodeji Amobonye et al.

Summary: Plastic waste poses a serious threat to the environment, causing pollution, climate change, and disruption to aquatic ecosystems. Recent research has shifted focus to the potential of biological degradation of plastics, examining the roles of microorganisms and enzymes in this process.

SCIENCE OF THE TOTAL ENVIRONMENT (2021)

Article Environmental Sciences

Landfill microbiome harbour plastic degrading genes: A metagenomic study of solid waste dumping site of Gujarat, India

Raghawendra Kumar et al.

Summary: This study investigated the bacterial community structure and functional potential in a landfill site, revealing the presence of plastic degrading capabilities. The dominant phyla in soil and compost samples were Proteobacteria, Bacteroidetes, Firmicutes, and Actinobacteria, while in leachate samples, Firmicutes and Actinobacteria were predominant. The study also identified potential genes associated with the biodegradation of different types of plastics like polyethylene, polyethyl-ene terephthalate, and polystyrene.

SCIENCE OF THE TOTAL ENVIRONMENT (2021)

Editorial Material Microbiology

Editorial: Microbial Degradation of Plastics

Ren Wei et al.

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Plastic-Degrading Potential across the Global Microbiome Correlates with Recent Pollution Trends

Jan Zrimec et al.

Summary: Utilizing global environmental DNA sampling projects and constructing hidden Markov models, we identified the potential of global microorganisms to degrade plastics and compiled a catalogue of nonredundant enzyme homologues with the ability to degrade 10 different plastic types. We found that ocean and soil enzyme abundance relates to depth and plastic pollution, and the abundance of these enzymes correlates significantly with marine and country-specific plastic pollution trends.
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Biodegradation of microplastics in food and agriculture

Hannah S. Zurier et al.

Summary: The review of current microplastic literature focuses on their presence in wastewater treatment facilities and their biodegradation by microorganisms, proposing the introduction of engineered enzymes for microplastic degradation, and highlighting the potential of biocatalytic interventions for microplastic biodegradation in other areas of the food and agricultural systems.

CURRENT OPINION IN FOOD SCIENCE (2021)

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Emerging Roles of PETase and MHETase in the Biodegradation of Plastic Wastes

Writtik Maity et al.

Summary: PET, widely used in plastic products, has caused global concerns due to its accumulation in the environment. A novel bacterial strain called Ideonella sakaiensis 201-F6 has been discovered to utilize PET, offering hope for bioremediation strategies. Detailed understanding of the protein structure of these enzymes has opened up possibilities for enhancing degradation efficiency.

APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY (2021)

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Prevalence and characteristics of microplastics present in the street dust collected from Chennai metropolitan city, India

Arunkumar Patchaiyappan et al.

Summary: This study assessed microplastic pollution in road dust in Chennai, India for the first time, revealing a high average content of microplastics. The majority of quantified microplastics were fragments, and Raman spectroscopy and SEM-EDS analysis identified various polymer types and trace elements.

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Genomic and proteomic profiles of biofilms on microplastics are decoupled from artificial surface properties

Sonja Oberbeckmann et al.

Summary: The study found that the properties of different materials had minimal impact on the plastic-associated communities, with biogeographic factors playing a major role. Wood induced the formation of substrate-specific biofilms and served as a nutrient source. PE and PS microplastics in marine habitats may provide opportunities for phototrophic microorganisms but do not appear to biodegrade or harbor pathogenic microorganisms.

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Microplastics Originating from Polymer Blends: An Emerging Threat?

Xin-Feng Wei et al.

Summary: This article highlights the risk of microplastics from polymer blends, especially in the aging-induced fragmentation process where a significant amount of microplastics can be released. It emphasizes the importance of raising awareness about microplastic risks during the entire lifecycle of polymer blends, from development and production to use and waste handling. ""

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2021)

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More than 1000 rivers account for 80% of global riverine plastic emissions into the ocean

Lourens J. J. Meijer et al.

Summary: Research shows that plastic waste in the marine environment mainly comes from rivers, with a model approach predicting the probability of plastic waste entering the ocean and identifying regions likely to emit plastic into the ocean. It is estimated that over 1000 rivers globally contribute to 80% of plastic waste emissions, with small urban rivers being the most polluting.

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Chemical and biological catalysis for plastics recycling and upcycling

Lucas D. Ellis et al.

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Biodegradable chito-beads replacing non-biodegradable microplastics for cosmetics

Sungbin Ju et al.

Summary: This study focused on a biodegradable alternative to plastic microbeads called "chito-beads", which showed promising mechanical properties, stability, and low toxicity. Experimental results demonstrated that "chito-beads" performed well in terms of biodegradability, cleansing efficiency, and non-toxicity.

GREEN CHEMISTRY (2021)

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Ocean plastics: environmental implications and potential routes for mitigation - a perspective

Ethan Watt et al.

Summary: This review provides a comprehensive overview of the major sources and distribution of ocean plastic contamination, their potential environmental effects, and prospects for mitigating plastic pollution. It highlights the distinction between micro and macro plastics, discusses common plastic waste sources that end up in aquatic environments, and addresses potential pathways of prevention. The need for further research on the environmental impact of ocean plastics, their adverse health effects, and impact on marine habitats is emphasized, along with efforts to increase the feasibility of recycling ocean plastics and developing an international supply chain to tackle this growing problem.

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Microplastics and their possible sources: The example of Ofanto river in southeast Italy

Claudia Campanale et al.

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Mini-review of microplastics in the atmosphere and their risks to humans

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Foaming at the mouth: Ingestion of floral foam microplastics by aquatic animals

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Microplastics in soils: a review of possible sources, analytical methods and ecological impacts

Bin Zhang et al.

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