Abstract
The biodegradation studies were conducted to test the ability of the bacterial strains (Chry2 and Chry3) isolated from the oily sludge obtained from Gujarat refinery, India, for utilization of chrysene in the liquid medium. Biodegradation of the compound was confirmed using gas chromatography and the percent degradation was calculated to be 15.0 and 17% by Chry2 and Chry3, respectively. The biodegradation results were supported by increase in viable cell count and dry biomass, in the presence of chrysene as the sole carbon source. Both the cultures produced biosurfactant which was indicated by the reduction in surface tension of the growth medium. Presence of catechol 2, 3-dioxygenase gene in Chry3 indicated its potential for degradation of PAHs through meta cleavage degradation pathway. Both the strains were found to possess catechol 1,2-dioxygenase and catechol 2,3-dioxygenase enzyme activities. Based on morphological and biochemical tests, the cultures were tentatively identified as Bacillus sp. (Chry2) and Pseudomonas sp. (Chry3).
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Acknowledgments
The authors want to acknowledge the contributions of Dr. Hemant J. Purohit of Environment Genomic Unit, National Environmental Engineering Research Institute, Nagpur, for providing primers for enzyme studies.
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Dhote, M., Juwarkar, A., Kumar, A. et al. Biodegradation of chrysene by the bacterial strains isolated from oily sludge. World J Microbiol Biotechnol 26, 329–335 (2010). https://doi.org/10.1007/s11274-009-0180-6
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DOI: https://doi.org/10.1007/s11274-009-0180-6