title: Biodegradation of benzo[a]pyrene by bacterial consortium isolated from mangrove sediment.
abstract: Benzo[a]pyrene is a high-molecular-weight polycyclic aromatic hydrocarbon highly recalcitrant in nature and thus harms the ecosystem and/or human health. Therefore, its removal from the marine environment is crucial. This research focuses on benzo[a]pyrene degradation by using enriched bacterial isolates in consortium under saline conditions. Bacterial isolates capable of using benzo[a]pyrene as sole source of carbon and energy were isolated from enriched mangrove sediment. These isolates were identified as Ochrobactrum anthropi, Stenotrophomonas acidaminiphila, and Aeromonas salmonicida ss salmonicida. Isolated O. anthropi and S. acidaminiphila degraded 26% and 20%, respectively, of an initial benzo[a]pyrene concentration of 20 mg/L after 8 days of incubation in seawater (28 ppm of NaCl). Meanwhile, the bacterial consortium decomposed 41% of an initial 50 mg/L benzo[a]pyrene concentration after 8 days of incubation in seawater (28 ppm of NaCl). The degradation efficiency of benzo[a]pyrene increased to 54%, when phenanthrene was supplemented as a co-metabolic substrate. The order of biodegradation rate by temperature was 30°C > 25°C > 35°C. Our results suggest that co-metabolism by the consortium could be a promising biodegradation strategy for benzo[a]pyrene in seawater.
authors.affiliation: a Lasbela University of Agriculture, Water and Marine Sciences , Uthal , Pakistan.|b Institute of Biological Sciences, Faculty of Science , University of Malaya , Kuala Lumpur , Malaysia.|c Center for Research in Waste Management, Faculty of Science , University of Malaya , Kuala Lumpur , Malaysia.
authors.forename: A
authors.initials: A
authors.lastname: Aziz
authors.affiliation: b Institute of Biological Sciences, Faculty of Science , University of Malaya , Kuala Lumpur , Malaysia.|c Center for Research in Waste Management, Faculty of Science , University of Malaya , Kuala Lumpur , Malaysia.
authors.forename: P
authors.initials: P
authors.lastname: Agamuthu
authors.affiliation: b Institute of Biological Sciences, Faculty of Science , University of Malaya , Kuala Lumpur , Malaysia.|c Center for Research in Waste Management, Faculty of Science , University of Malaya , Kuala Lumpur , Malaysia.
authors.forename: F O
authors.initials: FO
authors.lastname: Alaribe
authors.affiliation: b Institute of Biological Sciences, Faculty of Science , University of Malaya , Kuala Lumpur , Malaysia.|c Center for Research in Waste Management, Faculty of Science , University of Malaya , Kuala Lumpur , Malaysia.
authors.forename: S H
authors.initials: SH
authors.lastname: Fauziah
mesh_terms: D001564:Benzo(a)pyrene / Q000032:analysis / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019015:Geologic Sediments / Q000737:chemistry / Q000382:microbiology*; D059013:Microbial Consortia; D012623:Seawater / Q000382:microbiology; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism*; D053833:Wetlands
chemical_list: D014874:Water Pollutants, Chemical; D001564:Benzo(a)pyrene
keywords: Benzo[a]pyrene; bacterial consortium; biodegradation; co-metabolism