Abstract
This work assessed biodegradation, by Aspergillus, Fusarium, Penicillium and Parengyodontium fungi, of four samples of poly-ε-caprolactone (PCL), three samples of poly-l-lactide (PLA) and one sample of poly-d,l-lactide (DL-PLA) produced by ring-opening polymerization initiated by aluminium complexes of corresponding lactones. Mesophilic fungal strains actively biodegrading PCL (F. solani) and PLA (Parengyodontium album and A. calidoustus) were selected. The rate of degradation by the selected fungi was found to depend on the physicochemical and mechanical properties of the polymers (molecular weight, polydispersity, crystallinity). The most degradable poly-ε-caprolactone sample was shown to have the lowest molecular weight; the most biodegradable polylactide DL-PLA had the lowest crystallinity. Mass spectral analysis of biodegraded polymer residues showed PCL to be degraded more intensively than PLA. It is established that in the case of Parengyodontium album the colonization of the films of polypropylene composites with DL-PLA is observed, which will undoubtedly contribute to their further destruction under the influence of abiotic factors in the environment.
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Acknowledgements
We thank Dr. V.A. Korolkov (N.D. Zelinsky Institute of Organic Chemistry RAS, Moscow, Russia) for mass-spectral data. This work was supported partially by M.V. Lomonosov Moscow State University Program of Development and G.K. Skryabin Institute of Biochemistry and Physiology of Microorganisms RAS.
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Antipova, T.V., Zhelifonova, V.P., Zaitsev, K.V. et al. Biodegradation of Poly-ε-caprolactones and Poly-l-lactides by Fungi. J Polym Environ 26, 4350–4359 (2018). https://doi.org/10.1007/s10924-018-1307-3
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DOI: https://doi.org/10.1007/s10924-018-1307-3