Biodegradação bacteriana de compostos organoclorados

Química Nova

Mariana Consiglio Kasemodel¹  André Luiz Meleiro Porto¹  Marcia Nitschke¹ 

[1] ,Universidade de São Paulo Instituto de Química de São Carlos Departamento de Físico-QuímicaSão Carlos SP ,Brasil

关键词: biodegradation;    DDD;    dieldrin;    PCP;    rhamnolipids;   

DOI  :  10.5935/0100-4042.20140218

来源: SciELO

【 摘 要 】

Due to their recalcitrant nature, organochlorides are already found in environment and the search for alternatives to eliminate these compounds such as biodegradation using native microorganisms is of great interest. A screening trial to select environmental bacteria able to degrade DDD, PCP and dieldrin was conducted. Among 14 isolates, the soil bacteria Pseudomonas aeruginosa L2-1 showed the highest tolerance to increasing concentrations of the organochlorides and was selected for further studies. Biodegradation was assessed in liquid medium, varying the concentrations of glucose and the presence of rhamnolipids (RL). The best medium for the occurrence of biodegradation of the compounds contained 0.5% glucose, giving approximately 50% yield after three days of incubation. Results showed that the biodegradation rates of the organochlorides by P. aeruginosa L2-1 were greater at low concentrations of glucose and in the presence of rhamnolipids.

【 授权许可】

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