African Journal of
Biotechnology

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12331

Full Length Research Paper

Analysis of the degradation of polyethylene, polystyrene and polyurethane mediated by three filamentous fungi isolated from the Antarctica

Rodrigo Oviedo-Anchundia
  • Rodrigo Oviedo-Anchundia
  • Centro de Investigaciones Biotecnológicas del Ecuador, CIBE, Facultad de Ciencias de la Vida, FCV, Escuela Superior Politécnica del Litoral, ESPOL, Campus Gustavo Galindo km. 30.5 Via Perimetral, P. O. Box 09-01-5863, Guayaquil, Ecuador.
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Daynet Sosa del Castillo
  • Daynet Sosa del Castillo
  • Centro de Investigaciones Biotecnológicas del Ecuador, CIBE, Facultad de Ciencias de la Vida, FCV, Escuela Superior Politécnica del Litoral, ESPOL, Campus Gustavo Galindo km. 30.5 Via Perimetral, P. O. Box 09-01-5863, Guayaquil, Ecuador.
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Jaime Naranjo-Morán
  • Jaime Naranjo-Morán
  • Centro de Investigaciones Biotecnológicas del Ecuador, CIBE, Facultad de Ciencias de la Vida, FCV, Escuela Superior Politécnica del Litoral, ESPOL, Campus Gustavo Galindo km. 30.5 Via Perimetral, P. O. Box 09-01-5863, Guayaquil, Ecuador.
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Nora Francois
  • Nora Francois
  • Grupo de Aplicaciones de Materiales Biocompatibles, Facultad de Ingeniería, Universidad de Buenos Aires, Av. Paseo Colón 850, 5º Piso, Buenos Aires, Argentina.
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José Álvarez-Barreto
  • José Álvarez-Barreto
  • Colegio de Ciencias e Ingenierías, Universidad San Francisco de Quito, Diego de Robles y Vía Interoceánica, Quito, Ecuador.
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Alejandro Alarcón
  • Alejandro Alarcón
  • Área de Microbiología, Postgrado de Edafología, Colegio de Postgraduados, km 36.5 Carretera México-Texcoco, C.P. 56230, Montecillo, Estado de México, México.
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Jhonny Saulo Villafuerte
  • Jhonny Saulo Villafuerte
  • Universidad Laica Eloy Alfaro de Manabí, Facultad Ciencias de la Educación. Ave.Circunvalación, C.P. 130802. Manta, Ecuador.
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Milton Barcos-Arias
  • Milton Barcos-Arias
  • Centro de Investigaciones Biotecnológicas del Ecuador, CIBE, Facultad de Ciencias de la Vida, FCV, Escuela Superior Politécnica del Litoral, ESPOL, Campus Gustavo Galindo km. 30.5 Via Perimetral, P. O. Box 09-01-5863, Guayaquil, Ecuador.
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  •  Received: 04 July 2020
  •  Accepted: 13 August 2020
  •  Published: 28 February 2021

Abstract

Plastic polymers are petroleum-derived synthetic materials that have multiple uses in everyday life, but their excessive production has led to the accumulation of approximately 1,000 million tons of residues, causing negative ecological impacts. This study analyzed the biological degradation in liquid medium of polyurethane, polystyrene, and polyethylene samples by filamentous fungi isolated from Antarctica. The plastic samples were used without pretreatment or pretreated with an artificial aging UV chamber according to ASTM G155 for 500 h, inoculated or not with the Antarctic fungi (Penicillium, Geomyces, Mortierella species). Samples were incubated at 18°C for 90 days to determine potential fungal biodegradation. The physical-chemical and biological degradation of plastics were evaluated by analyzing the weight loss in function of time, and by determining possible changes in the chemical structure, using the technique of Fourier Transform Infrared Spectroscopy (FTIR). The polymers exposed to the artificial aging chamber resulted in the oxidative degradation of plastics (detected by morphological and structural changes), which favored their biodegradation. Out of the three fungal strains, Penicillium spp. presented the highest degradation percentage in aged plastics corresponding to 28.3% in polyurethane, and to 8.39 and 3.53% in polystyrene and low-density polyethylene, respectively.

 

Key words: Plastic aging, polymers, filamentous fungi, fungal biodegradation, deterioration.