Biodegradation of waste
            <scp>PET</scp>

Hiraga, Kazumi; Taniguchi, Ikuo; Yoshida, Shousuke; Kimura, Yoshiharu; Oda, Kōhei

doi:10.15252/embr.201949365

Cited by 90 publications

(47 citation statements)

References 9 publications

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“…In this respect the aforementioned microbial consortium no. 46 from I. sakaiensis, may prove useful in bioremediation applications, either directly in the environment or in designated facilities for the treatment of PET waste and microplastics from marine and terrestrial sources (Hiraga et al, 2019). However, to fulfill the criteria for efficient bioremediation, natural microbial consortia require synthetic modifications to improve consortium interactions such as cell-cell signaling and metabolite exchange (Jaiswal et al, 2020).…”

Section: Future Perspectives Bioremediationmentioning

confidence: 99%

“…Chemical recycling aims to degrade PET into its basic monomers which can then be repolymerized. This method is unfavorable from an economic standpoint as the recovered monomers are more expensive than those from crude oil and despite its drawbacks, mechanical recycling is much more cost effective (Awaja and Pavel, 2005;Hiraga et al, 2019). In addition, chemical methods require the maintenance of high temperature and pressure as well as employing toxic reagents and several preceding unit operations (Wei and Zimmermann, 2017a;Koshti et al, 2018).…”

Section: Biological Recyclingmentioning

confidence: 99%

“…Bio-recycling holds great potential for improved efficiency and cost effectiveness over the aforementioned mechanical and chemical methods as well as helping to eliminate the occurrence of secondary pollutants that come with landfill and incineration (Webb et al, 2013). The possibility exists that a biological recycling process could be achieved using PET hydrolysis and further metabolism of its monomers by I. sakaiensis and other PET-degrading organisms and their enzymatic systems (Hiraga et al, 2019). However, bio-recycling is limited by the organism used, inherent polymer properties and the choice of pre-treatment.…”

Section: Biological Recyclingmentioning

confidence: 99%

“…Annually, plastic pollution is considered responsible for the death of around 1 million sea birds, as well as 100,000 marine mammals and turtles (Jaiswal et al, 2020). Furthermore, the partial breakdown of discarded plastics and treatment of synthetic fibers has resulted in the widespread shedding of microplastics and microfibers, respectively (Hiraga et al, 2019). In this form, plastics readily contaminate marine ecosystems and this has resulted in them entering the animal and human food chain, which has been linked to various adverse health effects, including immune disorders and congenital disabilities, as well as cancer (Jaiswal et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Genomic and metagenomic strategies, which allow both genomic and gene expression analysis of unculturable and culturable microbes, have broadened the extent to which genetic information can be explored (Handelsman, 2004;Parages et al, 2016). The ever-increasing number of genomic and metagenomic datasets has led to the identification of genes of interest, including those encoding cutinases and PET hydrolase homologs (Hiraga et al, 2019). For example, functional screening of a leaf-branch compost metagenome enabled the isolation of LC-cutinase, a cutinase homolog with PET-degrading activity (Sulaiman et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Microbial Polyethylene Terephthalate Hydrolases: Current and Future Perspectives

2020

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Plastic has rapidly transformed our world, with many aspects of human life now relying on a variety of plastic materials. Biological plastic degradation, which employs microorganisms and their degradative enzymes, has emerged as one way to address the unforeseen consequences of the waste streams that have resulted from mass plastic production. The focus of this review is microbial hydrolase enzymes which have been found to act on polyethylene terephthalate (PET) plastic. The best characterized examples are discussed together with the use of genomic and protein engineering technologies to obtain PET hydrolase enzymes for different applications. In addition, the obstacles which are currently limiting the development of efficient PET bioprocessing are presented. By continuing to study the possible mechanisms and the structural elements of key enzymes involved in microbial PET hydrolysis, and by assessing the ability of PET hydrolase enzymes to work under practical conditions, this research will help inform large-scale waste management operations. Finally, the contribution of microbial PET hydrolases in creating a potential circular PET economy will be explored. This review combines the current knowledge on enzymatic PET processing with proposed strategies for optimization and use, to help clarify the next steps in addressing pollution by PET and other plastics.

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Section: Future Perspectives Bioremediationmentioning

confidence: 99%

Section: Biological Recyclingmentioning

confidence: 99%

Section: Biological Recyclingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microbial Polyethylene Terephthalate Hydrolases: Current and Future Perspectives

2020

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Toward Making Poly(ethylene terephthalate) Degradable in Aqueous Environment

Chen

Wan-jin

et al. 2022

Macro Materials & Eng

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Polyethylene terephthalate (PET) is a non‐biodegradable polymer, and it takes hundreds of years or longer to degrade in nature. In the current study, it is demonstrated that the addition of calcium oxide (CaO) into PET renders a degradable PET in an aqueous environment. Specifically, PET/CaO composite samples are prepared by melt mixing and compression molding, and the capability of hydrolysis of the composite in an aqueous environment is evaluated using different characterization and testing methods. The results show that the PET/CaO mixture is thermally stable during melt processing, and the resulting composite undergoes controllable hydrolysis in a water bath with calcium terephthalate as a main hydrolysis byproduct. The PET/CaO composite is mechanically strong; for example, a 75/25 PET/CaO sample shows a strength comparable to that of the pure PET polymer. The results further show that the hydrolysis of the PET/CaO composite may be promoted by addition of other fillers such as glass fibers. It is anticipated that the development of such a degradable PET material may impact a number of application areas where disposable packaging materials and water dissolvable composite products are desired.

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A review on microbial bioremediation of polyethylene terephthalate microplastics

Kulkarni,

Patwardhan,

Iyer

et al. 2024

Environmental Quality Mgmt

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Microplastics (<5 mm size) continue to be a disruptor in the ecosystem being omnipresent in the various spheres of the earth. While there have been various approaches for their degradation, biological approaches continue to be an emerging technology owing to their reduced stress on the environment and energy efficiency. This review paper encompasses the problems created by these microplastics and specifically focuses on polyethylene terephthalate (PET) that are widely used in the packaging and textile industries. This review paper highlights the various microorganisms used to degrade PET and optimum conditions in which PET degradation was carried out. PET is converted to MHET (mono (2‐hydroxyethyl) terephthalic acid) by extracellular PETase, which is subsequently transferred into the periplasmic region of microorganisms by outer membrane anchored MHETase, which transforms MHET to terephthalic acid and ethylene glycol. Factors affecting PET degradation like temperature, pH, crystallinity and environment have also been analyzed.

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Biodegradation of waste PET

Abstract: The discovery of Ideonella sakaiensis, a plastic‐degrading bacterium, creates possibilities for a sustainable “bioeconomy” for recycling plastic waste.

Cited by 90 publications

References 9 publications

Microbial Polyethylene Terephthalate Hydrolases: Current and Future Perspectives

Microbial Polyethylene Terephthalate Hydrolases: Current and Future Perspectives

Toward Making Poly(ethylene terephthalate) Degradable in Aqueous Environment

A review on microbial bioremediation of polyethylene terephthalate microplastics

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