title: A microbial chip combined with scanning electrochemical microscopy.
abstract: A microbial chip for bioassay was fabricated and its performance was characterized by scanning electrochemical microscopy (SECM). The microbial chip was prepared by spotting a suspension of Escherichia coli on a polystyrene substrate by using a glass capillary pen. The respiration activity of the E. coli spot was imaged with SECM by mapping the oxygen concentration around the spot. The SECM images of the microbial chips clearly showed spots with lower reduction currents, indicating that E. coli in the spots uptake oxygen by respiration. The bactericidal effects of antibiotics (streptomycin and ampicillin) were measured using the E. coli-based microbial chip, and discussed in comparison with the minimum inhibitory concentration (MIC) determined by an agar plate dilution method.
authors.affiliation: Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kaya
authors.forename: M
authors.initials: M
authors.lastname: Nishizawa
authors.forename: T
authors.initials: T
authors.lastname: Yasukawa
authors.forename: M
authors.initials: M
authors.lastname: Nishiguchi
authors.forename: T
authors.initials: T
authors.lastname: Onouchi
authors.forename: T
authors.initials: T
authors.lastname: Matsue
mesh_terms: D000667:Ampicillin / Q000494:pharmacology; D001681:Biological Assay / Q000379:methods*; D004594:Electrophysiology; D004926:Escherichia coli / Q000378:metabolism; D005898:Glass / Q000737:chemistry; D008826:Microbial Sensitivity Tests; D008828:Microbiological Techniques; D008855:Microscopy, Electron, Scanning / Q000379:methods*; D010100:Oxygen / Q000378:metabolism; D010101:Oxygen Consumption; D013307:Streptomycin / Q000494:pharmacology
chemical_list: D000667:Ampicillin; D010100:Oxygen; D013307:Streptomycin