Degradation of carbazole and its derivatives by a Pseudomonas sp. |
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| Authors: | Li Li Qinggang Li Fuli Li Quan Shi Bo Yu Fengrui Liu Ping Xu |
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| Institution: | (1) State Key Laboratory of Microbial Technology, Shandong University, Jinan, 250100, People’s Republic of China;(2) School of Environmental Science and Engineering, Shandong University, Jinan, 250100, People’s Republic of China;(3) State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, 102200, People’s Republic of China |
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| Abstract: | Carbazole, carbazoles with monomethyl or dimethyls substituted on different positions (C1-carbazoles or C2-carbazoles), and benzocarbazoles, as toxic and mutagenic components of petroleum and creosote contamination, were biodegradable by an isolated bacterial strain Pseudomonas sp. XLDN4-9. C1-carbazoles were degraded in preference to carbazole and C2-carbazoles. The biodegradation of C1-carbazoles or C2-carbazoles was influenced by the positions of methyl substitutions. Among C1-carbazole isomers, 1-methyl carbazole was the most susceptible. C2-carbazole isomers with substitutions on the same benzo-nucleus were more susceptible at a concentration of less than 3.4 μg g−1 petroleum, especially when harboring one substitution on position 1. In particular, 1,5-dimethyl carbazole was the most recalcitrant dimethyl isomer. |
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| Keywords: | Biodegradation Carbazole Carbazole derivatives Pseudomonas sp Angular dioxygenase |
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