Aerobic degradation of 3-chlorobenzoic acid by an indigenous strain isolated from a polluted river |
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Authors: | Alfredo Gallego Virginia L. Gemini Ariana A. Rossen Susana L. Rossi Valeria Trípodi Daniel Corach Estela Planes Sonia E. Korol |
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Affiliation: | 1.Chair of Hygiene, Faculty of Pharmacy and Biochemistry,University of Buenos Aires,Buenos Aires,Argentina;2.National Institute of Industrial Technology,San Martín, Buenos Aires,Argentina;3.Digital Genetic Fingerprinting Service, Faculty of Pharmacy and Biochemistry,University of Buenos Aires,Buenos Aires,Argentina |
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Abstract: | An indigenous strain of Pseudomonas putida capable of degrading 3-chlorobenzoic acid as the sole carbon source was isolated from the Riachuelo, a polluted river in Buenos Aires. Aerobic biodegradation assays were performed using a 2-l microfermentor. Biodegradation was evaluated by spectrophotometry, chloride release, gas chromatography and microbial growth. Detoxification was evaluated by using Vibrio fischeri, Pseudokirchneriella subcapitata and Lactuca sativa as test organisms. The indigenous bacterial strain degrades 100 mg l−1 3-chlorobenzoic acid in 14 h with a removal efficiency of 92.0 and 86.1% expressed as compound and chemical oxygen demand removal, respectively. The strain was capable of degrading up to 1,000 mg of the compound l−1. Toxicity was not detected at the end of the biodegradation process. Besides initial concentration, the effect of different factors, such as initial pH, initial inoculum, adaptation to the compound and presence of other substrates and toxic related compounds, was studied. |
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