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Biodegradation

Fungal Communities Associated with the Biodegradation of Polyester Polyurethane Buried under Compost at Different Temperatures

Urooj Zafar, Ashley Houlden, Geoffrey D. Robson
Urooj Zafar
Faculty of Life Sciences, University of Manchester, Manchester, United Kingdom
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Ashley Houlden
Faculty of Life Sciences, University of Manchester, Manchester, United Kingdom
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Geoffrey D. Robson
Faculty of Life Sciences, University of Manchester, Manchester, United Kingdom
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DOI: 10.1128/AEM.02536-13
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ABSTRACT

Plastics play an essential role in the modern world due to their low cost and durability. However, accumulation of plastic waste in the environment causes wide-scale pollution with long-lasting effects, making plastic waste management expensive and problematic. Polyurethanes (PUs) are heteropolymers that made up ca. 7% of the total plastic production in Europe in 2011. Polyester PUs in particular have been extensively reported as susceptible to microbial biodegradation in the environment, particularly by fungi. In this study, we investigated the impact of composting on PUs, as composting is a microbially rich process that is increasingly being used for the processing of green waste and food waste as an economically viable alternative to landfill disposal. PU coupons were incubated for 12 weeks in fresh compost at 25°C, 45°C, and 50°C to emulate the thermophilic and maturation stages of the composting process. Incubation at all temperatures caused significant physical deterioration of the polyester PU coupons and was associated with extensive fungal colonization. Terminal restriction fragment length polymorphism (TRFLP) analysis and pyrosequencing of the fungal communities on the PU surface and in the surrounding compost revealed that the population on the surface of PU was different from the surrounding compost community, suggesting enrichment and selection. The most dominant fungi identified from the surfaces of PU coupons by pyrosequencing was Fusarium solani at 25°C, while at both 45°C and 50°C, Candida ethanolica was the dominant species. The results of this preliminary study suggest that the composting process has the potential to biodegrade PU waste if optimized further in the future.

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Fungal Communities Associated with the Biodegradation of Polyester Polyurethane Buried under Compost at Different Temperatures
Urooj Zafar, Ashley Houlden, Geoffrey D. Robson
Applied and Environmental Microbiology Nov 2013, 79 (23) 7313-7324; DOI: 10.1128/AEM.02536-13

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Fungal Communities Associated with the Biodegradation of Polyester Polyurethane Buried under Compost at Different Temperatures
Urooj Zafar, Ashley Houlden, Geoffrey D. Robson
Applied and Environmental Microbiology Nov 2013, 79 (23) 7313-7324; DOI: 10.1128/AEM.02536-13
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