Abstract
This paper investigates the effect of two nonionic surfactants (Tween 80 and Triton X-100) and hydroxypropyl-β-cyclodextrin (HP-β-CD) on the biodegradation of nitrobenzene (NB) by Acinetobacter sp. in liquid cultures at different dosages as well as the fate of both surfactants. When the initial concentration of NB was about 400 mg/l, neither Tween 80 nor HP-β-CD had any effect on the degradation of NB. However, Triton X-100 retarded the full removal of NB and the bacterial growth entering the stationary phase. While the initial concentration of NB was increased to about 850 mg/l, they all significantly enhanced the extent and rate of biodegradation if they were added at concentrations above 2000 mg/l. HP-β-CD could not be utilized by Acinetobacter sp. as the sole carbon source whereas both surfactants could, but no surfactant depletion was observed during the biodegradation of NB. So the rapid bacterial growth observed in the presence of each additive should be attributed to the rapid metabolism of NB. Both surfactants would promote the degradation of NB more than HP-β-CD would do if their dosages were increased properly.
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Shao, Y., Gao, S., Zhang, H. et al. Influence of nonionic surfactants and hydroxypropyl-β-cyclodextrin on the biodegradation of nitrobenzene. World Journal of Microbiology and Biotechnology 19, 783–790 (2003). https://doi.org/10.1023/A:1026026722568
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DOI: https://doi.org/10.1023/A:1026026722568