A comprehensive and critical review on key elements to implement enzymatic PET depolymerization for recycling purposes

Carniel, Adriano; Waldow, Vinícius de Abreu; Castro, Aline Machado de

doi:10.1016/j.biotechadv.2021.107811

Cited by 83 publications

(85 citation statements)

References 101 publications

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“…These biocatalytic reactions have the advantage of enabling PET hydrolysis under mild conditions (30-75 °C and ambient pressure) in aqueous solutions to provide BHET, mono-2hydroxyethylterephthalate (MHET), TPA, and EG with varying selectivity as products (Figure 45). Many reviews have been written on this topic 21,681,[785][786][787][788][789][790] and it is a highly active area of research, thus we only discuss highlights here. The first report of enzymatic hydrolysis of PET was in 2005 from Müller et al 791 wherein they showed appreciable extents of PET conversion over 3 weeks at 55 °C using a cutinase enzyme from the thermophilic bacterium Thermobifida fusca.…”

Section: Biocatalysismentioning

confidence: 99%

Expanding Plastics Recycling Technologies: Chemical Aspects, Technology Status and Challenges

Aguirre-Villegas

Allen

et al. 2022

Preprint

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Less than 10% of the plastics generated globally are recycled, while the rest are incinerated, accumulated in landfills, or leach into the environment. New technologies are emerging to chemically recycle waste plastics that are receiving tremendous interest from academia and industry. Chemists and chemical engineers need to understand the fundamentals of these technologies to design improved systems for chemical recycling and upcycling of waste plastics. In this paper, we review the entire life cycle of plastics and options for the management of plastic waste to address barriers to industrial chemical recycling and further provide perceptions on possible opportunities with such materials. Knowledge and insights to enhance plastic recycling beyond its current scale are provided. Outstanding research problems and where researchers in the field should focus their efforts in the future are also discussed.

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Section: Biocatalysismentioning

confidence: 99%

Expanding Plastics Recycling Technologies: Chemical Aspects, Technology Status and Challenges

Aguirre-Villegas

Allen

et al. 2022

Preprint

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“…The enzyme’s family of cutinases, lipases, proteases, and esterases are repurposed from original biopolymer degradation to corresponding bonds containing C-X class of plastic types (Carniel et al ., 2021; Satti & Shah, 2020). The PE, PS, LDPE, and PVA are only C-C class of plastic types in the local enzyme database associated with less than 20% of overall unique ids in the database.…”

Section: Resultsmentioning

confidence: 99%

Computational exploration of bio-remediation solution for mixed plastic waste

Malik

Maurya

Vats

et al. 2022

Preprint

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The plastic materials are recalcitrant in the open environment, surviving longer without complete remediation. The current disposal methods of used plastic material are not efficient; consequently, plastic wastes are infiltrating the natural resources of the biosphere. A sustaining solution for plastic waste is either recycling or making it part of the earth's biogeochemical cycle. We have collected, manually mined, and analyzed the previous reports on plastic biodegradation. Our results demonstrate that the biodegradation pattern of plastics follows the chemical classification of plastic types. Based on clustering analysis, the distant plastic types are grouped into two broad categories of plastic types, C-C (non-hydrolyzable) and C-X (hydrolyzable). The genus enrichment analysis suggests that Pseudomonas and Bacillus from bacteria and Aspergillus and Penicillium from fungal are potential genera for bioremediation of mixed plastic waste. Overall results have pointed towards a possible solution of mixed plastic waste either in a circular economy or open remediation. The meta-analysis of the reports revealed a historical inclination of biodegradation studies towards C-X type of plastic; however, the C-C class is dominated in overall plastic production. An interactive web portal of reports is hosted at plasticbiodegradation.com for easy access by other researchers for future studies.

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“…This enzyme group also serves as a representative set of catalysts to be further rened by evolution or engineering approaches for biotechnological application. 52,53,55,56 Though not pursued here, the exibility and throughput of this assay would be ideal for use comparing the activity of wild-type enzymes to such a panel of mutants against native or non-native substrates. Additionally, we examined commercial esterases, which may better simulate the type of highly diverse enzyme sets obtained in a library screen or an environmental sample.…”

Section: Discussionmentioning

confidence: 99%

A flexible kinetic assay efficiently sorts prospective biocatalysts for PET plastic subunit hydrolysis

et al. 2022

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A comprehensive and critical review on key elements to implement enzymatic PET depolymerization for recycling purposes

Cited by 83 publications

References 101 publications

Expanding Plastics Recycling Technologies: Chemical Aspects, Technology Status and Challenges

Expanding Plastics Recycling Technologies: Chemical Aspects, Technology Status and Challenges

Computational exploration of bio-remediation solution for mixed plastic waste

A flexible kinetic assay efficiently sorts prospective biocatalysts for PET plastic subunit hydrolysis

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