title: Hydrolysis of fenamiphos and its toxic oxidation products by Microbacterium sp. in pure culture and groundwater.
abstract: A bacterium with an exceptional ability to hydrolyse fenamiphos and its toxic oxidation products fenamiphos sulfoxide and fenamiphos sulfone, all possessing POC bond was isolated from soil. Based on 16S rRNA gene determination, this bacterium was putatively identified as Microbacterium esteraromaticum. The phenols (fenamiphos phenol, sulfoxide phenol and sulfone phenol) formed during bacterial hydrolysis resisted further degradation in mineral salts medium and sterile groundwater, but were transitory in non-sterile groundwater due to the catabolism of native microorganisms. Also, the cell-free preparation of this bacterium was highly effective in hydrolysing fenamiphos and its oxides. These results demonstrate the potential of this bacterium to detoxify pesticide waste in the environment including the groundwater.
authors.affiliation: Centre for Environmental Risk Assessment and Remediation, University of South Australia, Mawson Lakes Boulevard, SA 5095, Australia.
authors.forename: Tanya P
authors.initials: TP
authors.lastname: Cáceres
authors.forename: Mallavarapu
authors.initials: M
authors.lastname: Megharaj
authors.forename: Seidu
authors.initials: S
authors.lastname: Malik
authors.forename: Michael
authors.initials: M
authors.lastname: Beer
authors.forename: Ravi
authors.initials: R
authors.lastname: Naidu
mesh_terms: D000192:Actinomycetales / Q000378:metabolism*; D006868:Hydrolysis; D007306:Insecticides / Q000302:isolation & purification / Q000378:metabolism*; D009943:Organophosphorus Compounds / Q000302:isolation & purification / Q000378:metabolism*; D010084:Oxidation-Reduction; D014871:Water Microbiology; D014874:Water Pollutants, Chemical / Q000302:isolation & purification / Q000378:metabolism*; D018508:Water Purification / Q000379:methods*
chemical_list: D007306:Insecticides; D009943:Organophosphorus Compounds; D014874:Water Pollutants, Chemical; C002698:fenamiphos