Abstract
Polycyclic aromatic hydrocarbons (PAH) are persistent priority pollutants of soil and sediments. The use of white-rot fungi has been proposed as a means of bioremediating PAH-polluted sites. However, higher PAH compounds of low bioavailability in polluted soil are biodegraded slowly. In order to enhance their bioavailability, PAH solubilization, can be increased in water/solvent mixtures. The oxidation of a model PAH compound, anthracene, in the presence of cosolvents by the white-rot fungus, Bjerkandera sp. strain BOS55 was investigated. Acetone and ethanol at 5% were toxic to this fungus when added at the time of inoculation. However, when solvents up to 20% (v/v) were added to 9-day-old cultures, ligninolytic activity as indicated by Poly R-478 dye decolorization and anthracene oxidation was evident for several days. Since 20% solvent was toxic to cells, the oxidation of anthracene can be attributed to extracellular peroxidases, which were shown to tolerate the solvent. Solvent additions of 11%–21% (v/v) acetone or ethanol increased the rate of anthracene bioconversion to anthraquinone in liquid medium by a factor of 2–3 compared to fungal cultures receiving 1%–3% solvent.
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Field, J.A., Boelsma, F., Baten, H. et al. Oxidation of anthracene in water/solvent mixtures by the white-rot fungus, Bjerkandera sp. strain BOS55. Appl Microbiol Biotechnol 44, 234–240 (1995). https://doi.org/10.1007/BF00164508
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DOI: https://doi.org/10.1007/BF00164508