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<p>One of the most abundantly produced and used plastic is Polystyrene (PS) and is a continuous source of plastic waste. Among the plastic waste management strategies, most suitable and sustainable concept these days is the bio upcycling of the waste to value-added products using microorganisms. In the current study, a newly isolated fungi <i>Rhizopus oryzae</i> strain NA1 being isolated from the dumping site has been isolated and evaluated for the biodegradation potential against PS at environmental temperature (~ 30&#xa0;°C). The ability to biodegrade PS was determined using various analytical practices including Environmental Scanning Electron Microscopy (ESEM), Fourier Transform Infrared Spectroscopy (FTIR), and Gel Permeation Chromatography (GPC). The mineralization of PS films as demonstrated by the strum test (CO<sub>2</sub> evolution test) confirmed the biodeterioration of the polymer upon incubation with the newly isolated fungi. Pre-treatment strategies such as ultraviolet (UV) irradiation, heat treatment and making a PS-Starch blends seemed to promote the rate of biodegradation of PS with fungal strain NA1. The bioaugmentation of <i>Rhizopus oryzae</i> strain NA1 into the soil clearly demonstrated the capability of the strain to biodegrade PS film without any assistance from the other biotic or abiotic factors. Current study demonstrates that <i>Rhizopus oryzae</i> strain NA1 is a promising candidate to develop a new biotechnological route for not only the biodegradation of PS to its monomers but to the other mixed plastic waste as well under environmental conditions and puts the foundational step towards a circular economy based sustainable solution to plastic waste menace.</p>

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Evaluation of Polystyrene Biodegradation: Characterization of biodegradation kinetics of Rhizopus oryzae Strain NA1 at Mesophilic Temperature

  • 期刊论文

  • 发表日期：

    2025年9月10日

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  • Sadia Mehmood Satti,
  • Naima Atiq,
  • Asim Abbasi,
  • Safia Ahmed,
  • Muhammad Adnan Shereen,
  • Aftab Ahmad,
  • Abeer Hashem,
  • Najla A. Alshaikh,
  • Graciela Dolores Avila-Quezada,
  • Elsayed Fathi Abd-Allah

摘要

One of the most abundantly produced and used plastic is Polystyrene (PS) and is a continuous source of plastic waste. Among the plastic waste management strategies, most suitable and sustainable concept these days is the bio upcycling of the waste to value-added products using microorganisms. In the current study, a newly isolated fungi Rhizopus oryzae strain NA1 being isolated from the dumping site has been isolated and evaluated for the biodegradation potential against PS at environmental temperature (~ 30 °C). The ability to biodegrade PS was determined using various analytical practices including Environmental Scanning Electron Microscopy (ESEM), Fourier Transform Infrared Spectroscopy (FTIR), and Gel Permeation Chromatography (GPC). The mineralization of PS films as demonstrated by the strum test (CO2 evolution test) confirmed the biodeterioration of the polymer upon incubation with the newly isolated fungi. Pre-treatment strategies such as ultraviolet (UV) irradiation, heat treatment and making a PS-Starch blends seemed to promote the rate of biodegradation of PS with fungal strain NA1. The bioaugmentation of Rhizopus oryzae strain NA1 into the soil clearly demonstrated the capability of the strain to biodegrade PS film without any assistance from the other biotic or abiotic factors. Current study demonstrates that Rhizopus oryzae strain NA1 is a promising candidate to develop a new biotechnological route for not only the biodegradation of PS to its monomers but to the other mixed plastic waste as well under environmental conditions and puts the foundational step towards a circular economy based sustainable solution to plastic waste menace.