Abstract
Triclosan (TCS), a widely used antimicrobial and preservative agent, is an emerging contaminant in aqueous and soil environment. Microbial degradation of TCS has not been reported frequently because of its inhibition of microbe growth. To explore the new microbial resources for TCS biodegradation, fungal endophytes were isolated and screened for the degradation potential. The endophytic strain B4 isolated from Artemisia annua L. showed higher degradation efficiency and was identified as Penicillium oxalicum based on its morphology and ITS sequences of ribosomal DNA. In both medium and synthetic wastewater, TCS (5 mg/L) was almost completely degraded within 2 h by the strain B4. The high capacity of TCS uptake (127.60 ± 8.57 mg/g dry weight, DW) of fungal mycelium was observed during the first 10 min after TCS addition. B4 rapidly reduced initial content (5.00 mg/L) of TCS to 0.41 mg/L in medium in 10 min. Then, the accumulation of TCS in mycelium was degraded from 0.45 to 0.05 mg/g DW after 1-h treatment. The degradation metabolites including 2-chlorohydroquinone, 2, 4-dichloropheno, and hydroquinone were found to be restrained in mycelia. The end products of the biodegradation in medium showed no toxicity to Escherichia coli. The new characteristics of high adsorption, fast degradation, and low residual toxicity highlight the potential of endophytic P. oxalicum B4 in TCS bioremediation.
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Acknowledgements
The authors are grateful to the projects supported by the National Natural Science Foundation of China (No. 81273487, 81473183), Soochow Scholar Program (No. 14317363), the Natural Science Foundation of Yunnan (No. 2017FB132), and the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX17_2042).
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Tian, H., Ma, Y.J., Li, W.Y. et al. Efficient degradation of triclosan by an endophytic fungus Penicillium oxalicum B4. Environ Sci Pollut Res 25, 8963–8975 (2018). https://doi.org/10.1007/s11356-017-1186-5
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DOI: https://doi.org/10.1007/s11356-017-1186-5