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Influence of the Carbon Source on Gordonia alkanivorans Strain 1B Resistance to 2-Hydroxybiphenyl Toxicity

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Abstract

The viability of bacteria plays a critical role in the enhancement of fossil fuels biodesulfurization efficiency since cells are exposed to toxic compounds such as 2-hydroxybiphenyl (2-HBP), the end product of dibenzothiophene (DBT) biodesulfurization. The goal of this work was to study the influence of the carbon source on the resistance of Gordonia alkanivorans strain 1B to 2-HBP. The physiological response of this bacterium, pre-grown in glucose or fructose, to 2-HBP was evaluated using two approaches: a growth inhibition toxicity test and flow cytometry. The results obtained from the growth inhibition bioassays showed that the carbon source has an influence on the sensitivity of strain 1B growing cells to 2-HBP. The highest IC50 value was obtained for the assay using fructose as carbon source in both inoculum growth and test medium (IC50-48 h = 0.464 mM). Relatively to the evaluation of 2-HBP effect on the physiological state of resting cells by flow cytometry, the results showed that concentrations of 2-HBP >1 mM generated significant loss of cell viability. The higher the 2-HBP concentration, the higher the toxicity effect on cells and the faster the loss of cell viability. In overall, the flow cytometry results highlighted that strain 1B resting cells grown in glucose-SO4 or glucose-DBT are physiologically less resistant to 2-HBP than resting cells grown in fructose-SO4 or fructose-DBT, respectively.

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Acknowledgments

The present work was financed by FEDER funds through POFC-COMPETE and by national funds through Fundação para a Ciência e a Tecnologia (FCT) in the scope of the project Carbon4Desulf—FCOMP-01-0124-FEDER-013932 (Ex–PTDC/AAC-AMB/112841/2009).

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Authors and Affiliations

  1. LNEG—Instituto Nacional de Energia e Geologia IP, Unidade de Bioenergia, Estrada do Paço do Lumiar, 22, 1649-038, Lisbon, Portugal

    Alexandra V. Teixeira, Susana M. Paixão, Teresa Lopes da Silva & Luís Alves

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  1. Alexandra V. Teixeira
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  2. Susana M. Paixão
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  3. Teresa Lopes da Silva
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  4. Luís Alves
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Correspondence to Susana M. Paixão or Luís Alves.

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Teixeira, A.V., Paixão, S.M., da Silva, T.L. et al. Influence of the Carbon Source on Gordonia alkanivorans Strain 1B Resistance to 2-Hydroxybiphenyl Toxicity. Appl Biochem Biotechnol 173, 870–882 (2014). https://doi.org/10.1007/s12010-014-0902-6

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  • DOI: https://doi.org/10.1007/s12010-014-0902-6

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