Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Polymer Film-Based Screening and Isolation of Polylactic Acid (PLA)-Degrading Microorganisms

  • Kim, Mi Yeon (School of Chemical and Biomolecular Engineering, Pusan National University) ;
  • Kim, Changman (School of Chemical and Biomolecular Engineering, Pusan National University) ;
  • Moon, Jungheun (School of Chemical and Biomolecular Engineering, Pusan National University) ;
  • Heo, Jinhee (Advanced Characterization & Analysis Research Group, Korea Institute of Materials Science (KIMS)) ;
  • Jung, Sokhee P. (Department of Environmental and Energy Engineering, Chonnam National University) ;
  • Kim, Jung Rae (School of Chemical and Biomolecular Engineering, Pusan National University)
  • Received : 2016.10.07
  • Accepted : 2016.11.12
  • Published : 2017.02.28
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Abstract

Polylactic acid (PLA) has been highlighted as an alternative renewable polymer for the replacement of petroleum-based plastic materials, and is considered to be biodegradable. On the other hand, the biodegradation of PLA by terminal degraders, such as microorganisms, requires a lengthy period in the natural environment, and its mechanism is not completely understood. PLA biodegradation studies have been conducted using mainly undefined mixed cultures, but only a few bacterial strains have been isolated and examined. For further characterization of PLA biodegradation, in this study, the PLA-degrading bacteria from digester sludge were isolated and identified using a polymer film-based screening method. The enrichment of sludge on PLA granules was conducted with the serial transference of a subculture into fresh media for 40 days, and the attached biofilm was inoculated on a PLA film on an agar plate. 3D optical microscopy showed that the isolates physically degraded the PLA film due to bacterial degradation. 16S rRNA gene sequencing identified the microbial colonies to be Pseudomonas sp. MYK1 and Bacillus sp. MYK2. The two isolates exhibited significantly higher specific gas production rates from PLA biodegradation compared with that of the initial sludge inoculum.

Keywords

References

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