Abstract
This paper presents the results of an experimental study of the bacterial-mediated biodegradation of linear low density polyethylene (LLDPE) by Serratia marcescens subsp. marcescens (S. marcescens marcescens) bacterium without prior exposure of the LLDPE to thermo-oxidative aging. Degradation promoted by supernatant from S. marcescens marcescens was also studied, and compared to that promoted by direct exposure to S. marcescens marcescens cells. The results show that the cell-free extracts degrade LLDPE faster than the S. marcescens marcescens. The mechanisms of degradation are also elucidated via Scanning Electron Microscopy, Differential Scanning Calorimetry and Fourier Transform Infra-Red Spectroscopy. These methods show that the S. marcescens marcescens and its supernatant both degrade LLDPE. There was also an increase in the concentrations of the carbonyl groups (new peaks) after the microbial degradation of LLDPE. The degradation process results in the formation and growth of microvoids. The latter are also found to coalesce to form larger defects with increasing exposure to supernatant/cell-free extracts or S. marcescens marcescens.
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Acknowledgments
This research was supported by the STEP B program of the World Bank, the World Bank African Centers of Excellence Program, the African Capacity Building Foundation, the Sheda Science and Technology Complex (SHESTCO), Princeton University and the Nelson Mandela Institution and the African University of Science and Technology. The authors are grateful to these sponsors for their support.
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Azeko, S.T., Etuk-Udo, G.A., Odusanya, O.S. et al. Biodegradation of Linear Low Density Polyethylene by Serratia marcescens subsp. marcescens and its Cell Free Extracts. Waste Biomass Valor 6, 1047–1057 (2015). https://doi.org/10.1007/s12649-015-9421-0
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DOI: https://doi.org/10.1007/s12649-015-9421-0