title: Mediated microbial biosensor using a novel yeast strain for wastewater BOD measurement.
abstract: Two new yeast strains (SPT1 and SPT2) were isolated and immobilized on glassy carbon electrodes to form microbial biosensors for estimation of biochemical oxygen demand (BOD). Ferricyanide was proven to be the most efficient mediator to shuttle electrons from the redox center of reduced microbial enzymes to the electrode in the presence of excess glucose/glutamic acid (GGA). With a 3-fold greater metabolic assimilation capability and greater responses to various effluent samples, SPT1 was selected for sensor-BOD measurements. BOD estimations for the GGA standard resulted in an extended linear range: 2-100 mg/l. Response reproducibility was +/-10% for a GGA standard containing 10 mg BOD/l. For analysis of pulp mill effluents, the BOD detection limit was 2 mg/l with a response time of 5 min.
authors.affiliation: Biotechnology Research Institute, National Research Council Canada, Montreal, Quebec.
authors.forename: S P
authors.initials: SP
authors.lastname: Trosok
authors.forename: B T
authors.initials: BT
authors.lastname: Driscoll
authors.forename: J H
authors.initials: JH
authors.lastname: Luong
mesh_terms: D015374:Biosensing Techniques / Q000379:methods*; D018914:Cells, Immobilized; D003470:Culture Media; D004566:Electrodes; D005292:Ferricyanides / Q000378:metabolism; D010101:Oxygen Consumption; D010209:Paper; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014865:Waste Disposal, Fluid; D014871:Water Microbiology; D015003:Yeasts / Q000166:cytology* / Q000254:growth & development / Q000302:isolation & purification
chemical_list: D003470:Culture Media; D005292:Ferricyanides; C007931:hexacyanoferrate III