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Giyoung Kim,Mark Morgan,Daniel Ess,Byoung-Kwon Hahm,Aparna Kothapalli,Arun Bhunia 한국식품과학회 2007 Food Science and Biotechnology Vol.16 No.3
Conventional methods for pathogen detection and identification are labor-intensive and take days to complete. Biosensors have shown great potential for the rapid detection of foodborne pathogens. Fiber-optic biosensors have been used to rapidly detect pathogens because they can be very sensitive and are simple to operate. However, many fiber-optic biosensors rely on manual sensor handling and the sandwich assay, which require more effort and are less sensitive. To increase the simplicity of operation and detection sensitivity, a binding inhibition assay method for detecting Listeria monocytogenes in food samples was developed using an automated, fiber-optic-based immunosensor; RAPTOR (Research International, Monroe, WA, USA). For the assay, fiber-optic biosensorswere developed by the immobilization of Listeria antibodies on polystyrene fiber waveguides through a biotin-avidin reaction. Developed fiber-optic biosensors were incorporated into the RAPTOR to evaluate the detection of L. monocytogenes in frankfurter samples. The binding inhibition method combined with RAPTOR was sensitive enough to detect L. monocytogenes (5.4ⅹ10? CFU/mL) in a frankfurter sample.
Detection of Listeria Monocytogenes Using an Automated Fiber-Optic Biosensor: RAPTOR
Kim, Gi Young,Morgan, Mark T.,Ess, Daniel,Hahm, Byoung Kwon,Kothapalli, Aparna,Valadez, Angela,Bhunia, Arun Trans Tech Publications, Ltd. 2006 Key Engineering Materials Vol.321 No.-
<P>Fiber-optic biosensor uses light transmittable tapered fiber to send excitation laser light and receive emitted fluorescent light. The fluorescent light excited by an evanescent wave generated by the laser is quantitatively related to biomolecules immobilized on the fiber surface [1]. An automated fiber-optic biosensor based detection method for Listeria monocytogenes was developed in this research. Detections of Listeria monocytogenes in hotdog sample were performed to evaluate the method. By using the detection method with automated fiber-optic biosensor, 5.4×107 cfu/ml of Listeria monocytogenes was able to detect.</P>
Binding Inhibition Assay Using Fiber-Optic Based Biosensor for the Detection of Foodborne Pathogens
Morgan, Mark T.,Kim, Gi Young,Ess, Daniel,Kothapalli, Aparna,Hahm, Byoung Kwon,Bhunia, Arun Trans Tech Publications, Ltd. 2006 Key Engineering Materials Vol.321 No.-
<P>Frequent outbreaks of foodborne illness have been increasing the need for simple, rapid and sensitive methods to detect foodborne pathogens. Conventional methods for pathogen detection and identification are labor-intensive and take days to complete. Some immunological rapid assays are developed, but these assays still require prolonged enrichment steps. Biosensors have shown great potential for the rapid detection of foodborne pathogens. Among the biosensors, fiber-optic methods have much potential because they can be very sensitive and simple to operate. Fiber-optic biosensors typically use a light transmittable, tapered fiber to send excitation laser light to the detection surface and receive emitted fluorescent light. The fluorescent light excited by an evanescent wave generated by the laser is quantitatively related to fluorophor-labeled biomolecules immobilized on the fiber surface. A portable and automated fiber-optic biosensor, RAPTOR (Research International, Monroe, WA), was used to detect Salmonella enteritidis in food samples. A binding inhibition assay based on the biosensor was developed to detect the bacteria in hot dog samples. The biosensor and the binding inhibition assay could detect 104 cfu/ml of bacteria in less than 10 min of assay time.</P>