Abstract
In the present study, Acinetobacter pittii NFL and Enterobacter cloacae BT were studied for the first time for growth kinetics and biodegradation of pyrene over a range of 10–500 mg/L. E. cloacae BT and A. pittii NFL showed increase in specific growth rate from 0.0087 to 0.0318 h−1 and 0.0182 to 0.0320 h−1 up till 300 mg/L and 200 mg/L concentration, respectively. Maximum amount of pyrene degraded by the strain BT and NFL was found to be 241.7 ± 7.7 and 193.7 ± 2.1 mg/L, as determined by HPTLC. This high amount of pyrene degradation was facilitated by the biosurfactant released during growth with the compound. Biosurfactant production was validated by emulsification index (24 ± 4.8 and 36 ± 5.7% for BT and NFL, respectively) and drop collapse test, and, identified by FTIR analysis. Results indicated excellent efficiency of the acclimatized strains for pyrene degradation within few days, even when present at initial concentrations of high toxicity.
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