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Related Concept Videos

Microbial Bioremediation of Plastics01:28

Microbial Bioremediation of Plastics

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Polyethylene terephthalate (PET) is a synthetic polymer widely utilized in the packaging industry, particularly for bottles and containers. Due to its chemical stability and durability, PET accumulates in the environment, contributing significantly to plastic pollution. It comprises repeating units of terephthalic acid and ethylene glycol, resulting in a semi-crystalline structure that is resistant to natural degradation processes.A notable breakthrough in plastic biodegradation came with the...
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Types of Step-Growth Polymers: Polyesters01:20

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches...
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Microbial Bioremediation of Hydrocarbons01:26

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Bioremediation is an environmentally sustainable process that employs living organisms—primarily microorganisms—to degrade or neutralize pollutants from contaminated environments. In oil spills and hydrocarbon pollution, bioremediation involves the use of hydrocarbon-degrading bacteria to transform toxic compounds into less harmful substances. This approach leverages natural microbial metabolic processes and is considered both cost-effective and ecologically favorable compared to...
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Related Experiment Video

Updated: Apr 16, 2026

Aerobic Biodegradation Testing of Materials Using a Natural Marine Seawater Inoculum and Closed Loop Respirometer
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Aerobic Biodegradation Testing of Materials Using a Natural Marine Seawater Inoculum and Closed Loop Respirometer

Published on: October 24, 2025

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Engineering a robust IsPETase for energy-efficient PET depolymerization in natural seawater at ambient temperatures.

Xin Huang1, Qian Jia1, Guang Li1

  • 1State Key Laboratory of Biocontrol, Innovation Center for Evolutionary Synthetic Biology, Guangzhou Innovation Center of Biotechnology and Biomanufacturing, School of Life Sciences, Sun Yat-Sen University, Guangzhou, 510275, China.

Advanced Biotechnology
|April 15, 2026
PubMed
Summary

Enzymatic depolymerization of polyethylene terephthalate (PET) in seawater offers a novel, energy-efficient plastic recycling method. Engineered enzymes demonstrate superior performance, enabling efficient bioconversion of PET waste into valuable monomers.

Keywords:
Bio-recyclingEnzymatic depolymerizationEnzyme engineeringPET hydrolaseSeawater bio-catalysisSimultaneous enzymatic depolymerization and fermentation (SEDF)

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Area of Science:

  • Biotechnology
  • Environmental Science
  • Materials Science

Background:

  • Polyethylene terephthalate (PET) recycling is crucial due to its widespread use.
  • Enzymatic depolymerization in seawater is an underexplored, energy-efficient recycling strategy.
  • Limited research exists on PET hydrolase performance in saline environments.

Purpose of the Study:

  • To screen and engineer PET hydrolases for efficient depolymerization in seawater.
  • To develop a robust enzymatic platform for plastic bioconversion in marine environments.
  • To assess the potential of seawater-based recycling for polyethylene terephthalate.

Main Methods:

  • Screening of eight enzymes in artificial seawater at 30°C.
  • Semi-rational engineering of the most active enzyme, IsPETase, focusing on rigidifying flexible sites.
  • Characterization of the engineered variant (M8) for thermostability, activity, and expression yield.

Main Results:

  • Engineered variant M8 showed enhanced thermostability (+27.3°C), activity (1.14-fold), and expression yield (14.3-fold).
  • M8 depolymerization efficiency surpassed benchmark enzymes DuraPETase (32.2-fold) and LCC-ICCG (10.4-fold).
  • M8 efficiently depolymerized 15% PET powder in natural seawater at 37°C, producing monomers at 15.4 mM/day.

Conclusions:

  • The engineered M8 enzyme provides an efficient platform for PET depolymerization in saline conditions.
  • This study demonstrates the feasibility of seawater-based bioconversion processes for plastic recycling.
  • The findings pave the way for integrated, environmentally friendly plastic waste management solutions.