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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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Pesticides often feature structurally complex chemical architectures, incorporating halogen groups and multiple aromatic rings. These characteristics confer high chemical stability, rendering many pesticides resistant to natural degradation processes. This resistance poses significant environmental concerns, as persistent pesticide residues can accumulate in ecosystems and affect non-target organisms.Despite the inherent stability of many pesticides, certain microorganisms possess the metabolic...
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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

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Isolation of Native Soil Microorganisms with Potential for Breaking Down Biodegradable Plastic Mulch Films Used in Agriculture
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Microbial assisted High Impact Polystyrene (HIPS) degradation.

Arya J Mohan1, Vini C Sekhar1, Thallada Bhaskar2

  • 1Biotechnology Division, CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Trivandrum 695 019, Kerala, India.

Bioresource Technology
|March 20, 2016
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Summary

Newly isolated Pseudomonas and Bacillus bacteria effectively degrade brominated High Impact Polystyrene (HIPS). These microbes utilize e-plastic as a carbon source, showing significant degradation and weight loss, offering a potential bioremediation solution.

Keywords:
Bacillus speciesHigh Impact PolystyreneMethyl brominePseudomonas species

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Area of Science:

  • Microbiology
  • Polymer Science
  • Environmental Science

Background:

  • Brominated High Impact Polystyrene (HIPS) poses environmental challenges due to its persistence.
  • Bioremediation offers a sustainable approach to plastic waste management.

Purpose of the Study:

  • To investigate the efficacy of newly isolated Pseudomonas and Bacillus strains in degrading brominated HIPS.
  • To validate the use of these bacteria as a sole carbon source for e-plastic degradation.

Main Methods:

  • Microbial degradation assays using HIPS emulsion.
  • Validation of bacterial viability with Triphenyl Tetrazolium Chloride (TTC).
  • Confirmation of degradation via High-Performance Liquid Chromatography (HPLC), Nuclear Magnetic Resonance (NMR), Fourier-Transform Infrared Spectroscopy (FTIR), Thermogravimetric Analysis (TGA), and weight loss analysis.
  • Surface morphology analysis using Scanning Electron Microscopy (SEM).

Main Results:

  • Bacillus spp. and Pseudomonas spp. demonstrated high degradation efficacy, with 94% and 97% turbidity reduction, respectively, within four days.
  • NMR analysis confirmed the formation of aliphatic carbon chains and bromine release.
  • FTIR analysis indicated a reduction in CH, CO, and CN groups.
  • SEM visualized significant surface changes on the degraded HIPS film.
  • Degradation by Bacillus spp. resulted in a 23% (w/w) weight loss of the HIPS film over 30 days.

Conclusions:

  • Pseudomonas and Bacillus strains are effective agents for the biodegradation of brominated HIPS.
  • These microorganisms can utilize brominated HIPS as a sole carbon source.
  • The study confirms microbial degradation pathways involving chemical bond alterations and structural changes in the polymer.