title: Detection of Escherichia coli O157:H7 in 10- and 25-gram ground beef samples with an evanescent-wave biosensor with silica and polystyrene waveguides.
abstract: A portable evanescent-wave fiber-optic biosensor was used to detect Escherichia coli O157:H7 in seeded 10- and 25-g ground beef samples. The biosensor works by launching light from a 635-nm laser diode into specially designed optical fiber probes, generating an evanescent field that extends approximately 1,000 nm from the fiber surface. Fluorescent molecules within the evanescent field are excited, and a portion of their emission recouples into the fiber probe. The return path emission is transported by an optical fiber to a photodiode within the biosensor that detects and quantifies the fluorescent signal. A sandwich immunoassay was performed on the fiber probes with cyanine 5 dye-labeled polyclonal anti-E. coli O157:H7 antibodies for generation of the specific fluorescent signal. Biotin-streptavidin interactions were used to attach polyclonal anti-E. coli O157:H7 antibodies to the surface of the fiber probe. A centrifugation method was developed to obtain samples suitable for biosensor analysis from 10- and 25-g ground beef samples. The assay was shown to be sensitive and repeatable. One hundred percent correct identification of positive samples was demonstrated at 9.0 x 10(3) CFU/g for 25-g ground beef samples with silica waveguides and at 5.2 x 10(2) CFU/g for 10-g ground beef samples with polystyrene waveguides. The reaction was highly specific. No false positives were observed for 10-g ground beef samples not spiked with the pathogen. In addition, when samples were spiked with high concentrations of a variety of non-E. coli O157:H7 organisms, no false positives were observed. The method was rapid, with results being obtained within 25 min of sample processing.
authors.affiliation: Department of Biology, University of South Florida, Tampa 33620, USA.
authors.forename: Daniel R
authors.initials: DR
authors.lastname: Demarco
authors.forename: Daniel V
authors.initials: DV
authors.lastname: Lim
mesh_terms: D000818:Animals; D015374:Biosensing Techniques / Q000295:instrumentation / Q000379:methods*; D002417:Cattle; D019453:Escherichia coli O157 / Q000302:isolation & purification*; D005336:Fiber Optic Technology; D005516:Food Microbiology; D008461:Meat Products / Q000382:microbiology*; D055100:Optical Fibers; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013997:Time Factors