title: Study of the biodegradation process of polychlorinated biphenyls in liquid medium and soil by a new isolated aerobic bacterium (Janibacter sp.).
abstract: We have isolated and characterised a novel aerobic bacterial strain, designated MS3-02, belonging to the genus Janibacter sp. The capability of this new strain to degrade polychlorinated biphenyls (PCBs) in a commercial mixture (Aroclor 1242) in liquid medium and in soil (sterile and non sterile soil), under laboratory scale, has been evaluated. MS3-02 was isolated from the soil around of an incinerator, located in the east of Madrid (Spain). Gas-chromatographic analysis showed that MS3-02 was able to reduce most peaks observed in the chromatogram between 70% and 100% after seven days of incubation in a culture mineral medium containing yeast extract, but without the addition of biphenyl. The presence of biphenyl in the culture medium decreased the rate of PCB degradation by this bacterium. Comparing the performance of the MS3-02 in liquid culture medium and in soil, degradation was less efficient in sterile soil and still less efficient in non sterile soil. Under the best conditions (sterile soil and 20 weeks of incubation) MS3-02 was able to reduce, between 50% and 100%, nine of the main gas-chromatographic peaks in Aroclor 1242.
authors.affiliation: Centro de Tecnología de los Alimentos y Servicios, Biosanitarios, Universidad de Alcalá, 28871 Alcalá de Henares, Madrid, Spain.
authors.forename: Isabel
authors.initials: I
authors.lastname: Sierra
authors.forename: José Luis
authors.initials: JL
authors.lastname: Valera
authors.forename: M Luisa
authors.initials: ML
authors.lastname: Marina
authors.forename: Fernando
authors.initials: F
authors.lastname: Laborda
mesh_terms: D000192:Actinomycetales / Q000254:growth & development / Q000302:isolation & purification / Q000378:metabolism*; D001140:Aroclors / Q000378:metabolism*; D001420:Bacteria, Aerobic / Q000254:growth & development / Q000302:isolation & purification / Q000378:metabolism*; D001673:Biodegradation, Environmental; D002849:Chromatography, Gas; D003470:Culture Media / Q000737:chemistry; D011078:Polychlorinated Biphenyls / Q000378:metabolism*; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000378:metabolism*; D018505:Waste Management / Q000379:methods
chemical_list: D001140:Aroclors; D003470:Culture Media; D012989:Soil Pollutants; C027423:aroclor 1242; D011078:Polychlorinated Biphenyls