Degradation of polyester polyurethane by newly isolated Pseudomonas aeruginosa strain MZA-85 and analysis of degradation products by GC-MS

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• 作者：Ziaullah Shah^a ; Fariha Hasan^a ; Lee Krumholz^b ; Deniz Fulya Aktas^b ; Aamer Ali Shah^a ; ^{alishah@bs.qau.edu.pk} ; ^{alishah_75@yahoo.com}
• 关键词：Polyester polyurethane ; Biodegradation ; Pseudomonas aeruginosa ; Scanning electron microscopy ; Fourier transformed infra-red spectroscopy ; Sturm test ; Gas chromatography&ndash ; mass spectrometry
• 刊名：International Biodeterioration and Biodegradation
• 出版年：2013
• 出版时间：February, 2013
• 年：2013
• 卷：77
• 期：Complete
• 页码：114-122
• 全文大小：802 K

文摘

In this report, a polyester polyurethane (PU) degrading bacterium, designated as strain MZA-85, was isolated from soil through enrichment. The bacterium was identified through 16S rRNA gene sequencing; it was completely matched with Pseudomonas aeruginosa type strain. The degradation of PU film pieces by P. aeruginosa strain MZA-85 was investigated by scanning electron microscopy (SEM), Fourier transformed infra-red spectroscopy (FT-IR) and gel permeation chromatography (GPC). SEM micrographs of PU film pieces, treated with strain MZA-85, revealed changes in the surface morphology. FTIR spectrum showed increase in organic acid functionality and corresponding decrease in ester functional group. GPC results revealed increase in polydispersity, which shows that long chains of polyurethane polymer are cleaved into shorter chains by microbial action. The bacterium was found to produce cell associated esterases based on p-Nitrophenyl acetate (pNPA) hydrolysis assay. 1,4-Butanediol and adipic acid monomers were detected by gas chromatography-mass spectrometry (GC-MS), which were produced as a result of hydrolysis of ester linkages in PU by cell bound esterases. Strain MZA-85 not only depolymerized PU but also mineralized it into CO₂ and H₂O, as indicated by increase in cells growth in the presence of degradation products as well as detection of CO₂ evolution through Sturm test. From the results presented above, it is finally concluded that P. aeruginosa strain MZA-85, as well as its enzymes, can be applied in the process of biochemical monomerization for the pure monomers recycling.