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

Autor: Carniel A; School of Chemistry, Federal University of Rio de Janeiro (UFRJ) - Cidade Universitária, Rio de Janeiro, RJ CEP 21949-900, Brazil., Waldow VA; Petrobras Research, Development and Innovation Center (Cenpes), Av. Horácio Macedo, n° 950 - Cidade Universitária, Rio de Janeiro, RJ CEP 21941-915, Brazil., Castro AM; Petrobras Research, Development and Innovation Center (Cenpes), Av. Horácio Macedo, n° 950 - Cidade Universitária, Rio de Janeiro, RJ CEP 21941-915, Brazil. Electronic address: alinebio@petrobras.com.br.
Jazyk: angličtina
Zdroj: Biotechnology advances [Biotechnol Adv] 2021 Nov 15; Vol. 52, pp. 107811. Date of Electronic Publication: 2021 Jul 29.
DOI: 10.1016/j.biotechadv.2021.107811
Abstrakt: Plastics production and recycling chains must be refitted to a circular economy. Poly(ethylene terephthalate) (PET) is especially suitable for recycling because of its hydrolysable ester bonds and high environmental impact due to employment in single-use packaging, so that recycling processes utilizing enzymes are a promising biotechnological route to monomer recovery. However, enzymatic PET depolymerization still faces challenges to become a competitive route at an industrial level. In this review, PET characteristics as a substrate for enzymes are discussed, as well as the analytical methods used to evaluate the reaction progress. A comprehensive view on the biocatalysts used is discussed. Subsequently, different strategies pursued to improve enzymatic PET depolymerization are presented, including enzyme modification through mutagenesis, utilization of multiple enzymes, improvement of the interaction between enzymes and the hydrophobic surface of PET, and various reaction conditions (e.g., particle size, reaction medium, agitation, and additives). All scientific developments regarding these different aspects of PET depolymerization are crucial to offer a scalable and competitive technology. However, they must be integrated into global processes from upstream to downstream, discussed here at the final sections, which must be evaluated for their economic feasibility and life cycle assessment to check if PET recycling chains can be broadly incorporated into the future circular economy.
(Copyright © 2021 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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