Abstract
Dibutyl phthalate (DBP) is a widely used plasticizer, whose presence in the environment as a pollutant raises concern because of its endocrine-disrupting toxicity. Growth kinetics, glucose uptake, biodegradation constant of DBP (k), half-life of DBP biodegradation (t1/2) and percentage of removal efficiency (%E) were evaluated for Fusarium culmorum grown on media containing glucose and different concentrations of DBP (500 and 1000 mg/l). Intermediate compounds of biodegraded DBP were identified by GC–MS and a novel DBP biodegradation pathway was proposed on the basis of the intermolecular flow of electrons of the intermediates identified using quantum chemical modeling. F. culmorum degraded 99% of both 1000 and 500 mg of DBP/l after an incubation period of 168 and 228 h, respectively. %E was 99.5 and 99.3 for 1000 and 500 mg of DBP/l, respectively. The k was 0.0164 and 0.0231 h−1 for 500 and 1000 mg of DBP/l, respectively. DBP was fully metabolized to fumaric and malic acids, which are compounds that enter into the Krebs cycle. F. culmorum has a promising ability for bioremediation of environments polluted with DBP because it efficiently degrades DBP and uses high concentrations of this compound as carbon and energy source.
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Acknowledgements
We are thankful to the Mexican Council for Science and Technology (CONACyT) for providing a doctoral scholarship (no. 351476) to Miriam Ahuactzin-Pérez.
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MA-P; did the experimental work (Ph.D. thesis). ST-B and ES-J; drew the DBP biodegradation pathway. JG-D; did the GC–MS analysis. MG-P; did the quantum chemical studies. MCG-R; co-supervised MAP Ph.D. thesis and checked the MS. CS; co-supervised MAP Ph.D. thesis and wrote the MS.
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Ahuactzin-Pérez, M., Tlecuitl-Beristain, S., García-Dávila, J. et al. Mineralization of high concentrations of the endocrine disruptor dibutyl phthalate by Fusarium culmorum. 3 Biotech 8, 42 (2018). https://doi.org/10.1007/s13205-017-1065-2
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DOI: https://doi.org/10.1007/s13205-017-1065-2