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Setting new standards: Multiphasic analysis of microplastic mineralization by fungi. | LitMetric

AI Article Synopsis

  • Plastic materials are beneficial but accumulate in the environment due to their durability, leading to the creation of hazardous microplastics, primarily from polystyrene.
  • The tropical sooty mold fungus Capnodium coffeae was studied for its ability to biodegrade polystyrene, showing significant growth in its presence but only limited mineralization of the plastic.
  • The research suggests that while C. coffeae can encourage the breakdown of polystyrene, it shows minimal use of plastic as a carbon source, prompting calls for new standards to evaluate plastic-degrading microbes.

Article Abstract

Plastic materials provide numerous benefits. However, properties such as durability and resistance to degradation that make plastic attractive for variable applications likewise foster accumulation in the environment. Fragmentation of plastics leads to the formation of potentially hazardous microplastic, of which a considerable amount derives from polystyrene. Here, we investigated the biodegradation of polystyrene by the tropical sooty mold fungus Capnodium coffeae in different experimental setups. Growth of C. coffeae was stimulated significantly when cultured in presence of plastic polymers rather than in its absence. Stable isotope tracing using C-enriched polystyrene particles combined with cavity ring-down spectroscopy showed that the fungus mineralized polystyrene traces. However, phospholipid fatty acid stable isotope probing indicated only marginal assimilation of polystyrene-C by C. coffeae in liquid cultures. NMR spectroscopic analysis of residual styrene contents prior to and after incubation revealed negligible changes in concentration. Thus, this study suggests a plastiphilic life style of C. coffeae despite minor usage of plastic as a carbon source and the general capability of sooty mold fungi to stimulate polystyrene mineralization, and proposes new standards to identify and unambiguously demonstrate plastic degrading capabilities of microbes.

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Source
http://dx.doi.org/10.1016/j.chemosphere.2023.141025DOI Listing

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