AI Article Synopsis
- Polylactic acid (PLA) is a versatile bioplastic derived from lactic acid, known for its high melting point, mechanical strength, and transparency, but its safe disposal poses environmental challenges due to its resistance to microbial degradation.
- A method was developed to isolate rare actinomycetes with proteolytic activity, leading to the identification of four strains capable of degrading emulsified PLA.
- Among these, the strain SNC showed the best PLA degradation capabilities, significantly eroding the polymer and achieving a weight loss of 36% within one month under mesophilic conditions.
Article Abstract
Polylactic acid (PLA), a bioplastic synthesized from lactic acid, has a broad range of applications owing to its excellent proprieties such as a high melting point, good mechanical strength, transparency, and ease of fabrication. However, the safe disposal of PLA is an emerging environmental problem: it resists microbial attack in environmental conditions, and the frequency of PLA-degrading microorganisms in soil is very low. To date, a limited number of PLA-degrading bacteria have been isolated, and most are actinomycetes. In this work, a method for the selection of rare actinomycetes with extracellular proteolytic activity was established, and the technique was used to isolate four mesophilic actinomycetes with the ability to degrade emulsified PLA in agar plates. All four strains-designated SO1.1, SO1.2, SNC, and SST-belong to the genus . The PLA-degrading capability of the four strains was investigated by testing their ability to assimilate lactic acid, fragment PLA polymers, and deteriorate PLA films. The strain SNC was the best PLA degrader-it was able to assimilate lactic acid, constitutively cleave PLA, and form a thick and widespread biofilm on PLA film. The activity of this strain extensively eroded the polymer, leading to a weight loss of 36% in one month in mesophilic conditions.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6955660 | PMC |
| http://dx.doi.org/10.3390/microorganisms7120590 | DOI Listing |
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