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Polyethylene terephthalate (PET) biodegradation by Pleurotus ostreatus and Pleurotus pulmonarius

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Abstract

The essential properties of polyethylene terephthalate (PET), such as chemical inertness and durability that make it a suitable material for the packaging of mineral and soft drinks, have led to it becoming a major environmental pollutant and a threat to the planet. Ecologically friendly solutions such as bioremediation are now being advocated for by scientists. This paper, therefore, seeks to explore the potential capacity of Pleurotus ostreatus and Pleurotus pulmonarius in biodegrading PET plastic on two different substrates (soil and rice straw). The substrates were combined with 5% and 10% plastic before inoculation with Pleurotus ostreatus and Pleurotus pulmonarius and then left to incubate for 2 months. Biodegradation, monitored by FT-IR pointed to the formation of new peaks in the incubated plastics after 30 and 60 days unlike in the control. Changes in band intensity and shifts in the wavenumbers caused by stretching of functional groups, C–H, O–H and N–H in the band region of 2898 cm−1 to 3756 cm−1 are confirmed indicators of successful breakdown caused by contact with P. ostreatus and P. pulmonarius. The FT-IR analysis also gave an indication of N–H stretching at 3338.04 cm−1 and 3228.62 cm−1 for PET flakes incubated with Pleurotus sp. Furthermore, degradation products like hydrocarbons, carboxylic acids, alcohols, esters, and ketones were also detected in the GC–MS analysis of the decomposed PET plastic after 30 and 60 days. These compounds are formed due to chain scission caused by the fungal species. There was a discoloration of the PET flakes caused by an increase in carboxyl-terminated species as a result of enzymes secreted by the fungi in the process of biodegradation.

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Acknowledgements

I wish to acknowledge the Department of Botany, University of Ibadan for providing laboratory facilities used for this research

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Authors and Affiliations

  1. Plant Physiology and Biochemistry Section, Botany Department, University of Ibadan, Ibadan, Nigeria

    Chioma Odigbo & Clementina Adenipekun

  2. Chemistry Department, University of Ibadan, Ibadan, Nigeria

    Ibrahim Oladosu

  3. Microbiology Department, University of Ibadan, Ibadan, Nigeria

    Adeniyi Ogunjobi

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  1. Chioma Odigbo
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  2. Clementina Adenipekun
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  3. Ibrahim Oladosu
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  4. Adeniyi Ogunjobi
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Contributions

Odigbo C. L: performed the experiment and wrote the paper. Adenipekun C. O: conceived and designed the research. Oladosu I. A: contributed data analysis and interpretation tools. Ogunjobi A. A: critical revision and approval of the manuscript.

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Correspondence to Chioma Odigbo or Clementina Adenipekun.

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Odigbo, C., Adenipekun, C., Oladosu, I. et al. Polyethylene terephthalate (PET) biodegradation by Pleurotus ostreatus and Pleurotus pulmonarius. Environ Monit Assess 195, 585 (2023). https://doi.org/10.1007/s10661-023-11153-5

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