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Enzymatic post-consumer poly(ethylene terephthalate) (PET) depolymerization using commercial enzymes.

Rodrigo Brackmann1,2, Cláudia de Oliveira Veloso1, Aline Machado de Castro3

  • 1Chemistry Institute, Rio de Janeiro State University (UERJ), Rua São Francisco Xavier, 524, PHLC, IQ, Sl.310, Rio de Janeiro, RJ CEP 20550-013 Brazil.

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Summary
This summary is machine-generated.

This study explored enzymatic degradation of post-consumer Poly(ethylene terephthalate) (PET) plastic. Humicola insolens cutinase (HiC) showed high activity, with temperature and enzyme concentration significantly impacting hydrolysis product yields for PET recycling.

Keywords:
Enzymatic depolymerizationLipasesPET hydrolysisPoly(ethylene terephthalate)Terephthalic acidUltrasound

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Area of Science:

  • Biotechnology
  • Polymer Science
  • Environmental Science

Background:

  • Poly(ethylene terephthalate) (PET) is a widely used synthetic polymer with poor biodegradability, leading to environmental accumulation.
  • Improper disposal of PET plastic poses significant threats to terrestrial and aquatic ecosystems.

Purpose of the Study:

  • To investigate the enzymatic degradation of post-consumer PET (PC-PET) using various hydrolase enzymes.
  • To identify the most effective enzyme and optimize reaction conditions for PC-PET hydrolysis.

Main Methods:

  • Screening of five commercial hydrolase enzymes for PC-PET degradation activity.
  • Evaluation of key reaction parameters including enzyme type, concentration, temperature, and ultrasound treatment using Humicola insolens cutinase (HiC).
  • Analysis of hydrolysis products: terephthalic acid (TPA), mono(2-hydroxyethyl) terephthalate (MHET), and bis(2-hydroxyethyl) terephthalate (BHET).

Main Results:

  • Humicola insolens cutinase (HiC) demonstrated the highest activity among the tested enzymes.
  • Reaction temperature significantly influenced the yield and ratio of hydrolysis products, with higher temperatures favoring TPA formation.
  • Enzymatic hydrolysis was highly sensitive to enzyme concentration, with optimal results observed at 40-50 vol % HiC.

Conclusions:

  • Enzymatic hydrolysis using HiC is a promising method for PC-PET degradation.
  • Optimizing temperature and enzyme concentration is crucial for efficient PET recycling.
  • The findings contribute valuable data for advancing enzyme-based plastic recycling technologies.