کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4364689 1301720 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Isolation and characterisation of fungal communities associated with degradation and growth on the surface of poly(lactic) acid (PLA) in soil and compost
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست علوم زیست محیطی (عمومی)
پیش نمایش صفحه اول مقاله
Isolation and characterisation of fungal communities associated with degradation and growth on the surface of poly(lactic) acid (PLA) in soil and compost
چکیده انگلیسی


• Colonisation & biodegradation of poly(lactic) acid coupons (96% l-isomer) in soil & compost were investigated.
• Fungi colonising PLA showed a high degree of selection from the surrounding community.
• PLA tensile strength loss was associated with significant fungal colonisation at 50 °C.
• Aspergillus fumigatus & Thermomyces lanuginosus were the principle fungi colonising PLA.
• A. fumigatus and T. lanuginosus were both shown to accelerate PLA degradation in monoculture.

Polylactic acid (PLA) is a compostable biopolymer that is currently used for short shelf-life product containers and waste disposal bags. At temperatures at or above its glass transition temperature (55°–62 °C), PLA in the presence of water undergoes chemical hydrolysis, progressively reducing polymer molecular weight and ultimately releasing lactic acid. The role of microorganisms in this process has largely focused on bacteria, with few studies investigating potential role of fungi. In this study, PLA (96% l-isomer) coupons were buried in soil or compost and incubated at 25 °C or 50 °C for up to 8 weeks. Physical disintegration of the coupons was seen only when incubated at 50 °C in both soil and compost. The principle fungal species identified from PLA coupons at 25 °C included Mortierella sp., Doratomyces microsporus, Fusarium solani, Fennellomyces sp., Aspergillus fumigatus, Verticillium sp., Lecanicillium saksenae, Cladosporium sp. and Trichoderma sp. Only Thermomyces lanuginosus and A. fumigatus were isolated from PLA at 50 °C and both were shown to cause significant PLA biodegradation as determined by tensile strength loss compared to abiotic controls. Terminal restriction fragment length polymorphism (TRFLP) demonstrated strong selection of specific fungal species from soil and compost communities on PLA the surface and a greater species diversity than could be detected by conventional culturing techniques.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Biodeterioration & Biodegradation - Volume 95, Part B, November 2014, Pages 301–310
نویسندگان
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