Abstract
In this work, a bacterial strain with suitable capability to metabolize carbazole (CAR) as a main nitrogen containing compound of petroleum was isolated and characterized. 16S rDNA gene analysis and morphological characteristics of the strain showed that the isolate belonged to the genus Achromobacter and was tentatively named as Achromobacter sp. strain CAR1389. The growth monitoring and biodegradation rate measurements of carbazole in minimal medium supplemented by 6 mM CAR revealed that the strain CAR1389 is able to remove more than 90 % of this compound at 25, 30, and 37 °C during 7 days. The effect of higher concentrations of the carbazole on growth rate and metabolizing activity of the strain exhibited the Achromobacter sp. strain CAR1389 can tolerate increasing levels of CAR concentration up to 21 mM in culture media and degrade 43 % of this toxic material. According to these results and high tolerance of this bacterium in regards to higher concentrations of CAR, we suggest the strain CAR1389 as a suitable isolate to do biorefining of crude oil and also bioremediation processes in highly contaminated area of carbazole.
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Acknowledgments
The authors are indebted to Dr. Younes Ghasemi for GC-Mass analysis. This study was supported by Shiraz University.
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Farajzadeh, Z., Karbalaei-Heidari, H.R. Isolation and characterization of a new Achromobacter sp. strain CAR1389 as a carbazole-degrading bacterium. World J Microbiol Biotechnol 28, 3075–3080 (2012). https://doi.org/10.1007/s11274-012-1105-3
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DOI: https://doi.org/10.1007/s11274-012-1105-3