Comparison of polylactic acid biodegradation ability of Brevibacillus brevis and Bacillus amyloliquefaciens and promotion of PLA biodegradation by soytone

Jaeyoung Yu, Pa Do Kim, Yewon Jang, Sung Kon Kim, Jeehoon Han, Jiho Min

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Polylactic acid (PLA), a biodegradable plastic, is used to substitute commercial plastics in various fields such as disposable packaging materials and mulching films. Although the biodegradation of PLA under submerged or composting conditions is accelerated, increasing the biodegradability of PLA under soil burial conditions is still a challenge. This study reviews and compares the PLA biodegradation ability of Bacillus amyloliquefaciens and Brevibacillus brevis, both PLA-degrading bacteria. The biodegradation ability of a single bacteria in non-composting conditions was evaluated. In addition, in terms of biostimulation, PLA biodegradation according to nitrogen sources was compared. As a result, a higher PLA biodegradation ability was found in B. brevis than in B. amyloliquefaciens. Moreover, it was confirmed that the biodegradation of the PLA film was increased by using soytone as a nitrogen source in both bacteria. Controlling the nitrogen source could be a new way to increase the biodegradation of PLA.

Original languageEnglish
Pages (from-to)477-487
Number of pages11
JournalBiodegradation
Volume33
Issue number5
DOIs
StatePublished - Oct 2022

Keywords

  • Bacillus amyloliquefaciens
  • Biodegradation
  • Brevibacillus brevis
  • Nitrogen source
  • Polylactic acid
  • Soytone

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