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https://doi.org/10.1371/journal.pone.0095429
Title: | A double-taper optical fiber-based radiation wave other than evanescent wave in all-fiber immunofluorescence biosensor for quantitative detection of Escherichia coli O157:H7 | Authors: | Zhang Z. Hua F. Liu T. Zhao Y. Li J. Yang R. Yang C. Zhou L. |
Keywords: | article bacterium detection colony forming unit controlled study diagnostic test accuracy study double taper optical fiber evanescent wave all fiber immunofluorescence biosensor double taper optical fiber radiation wave all fiber immunofluorescence biosensor electrical equipment Escherichia coli O157 ferrule connector fiber optic biosensor fiber optics food borne pathogen limit of detection microtechnology molecular probe nonhuman organisms by habitat particle size process optimization quantitative analysis sensitivity analysis Escherichia coli O157 genetic procedures isolation and purification procedures Biosensing Techniques Escherichia coli O157 Fiber Optic Technology |
Issue Date: | 2014 | Citation: | Zhang Z., Hua F., Liu T., Zhao Y., Li J., Yang R., Yang C., Zhou L. (2014). A double-taper optical fiber-based radiation wave other than evanescent wave in all-fiber immunofluorescence biosensor for quantitative detection of Escherichia coli O157:H7. PLoS ONE 9 (5) : e95429. ScholarBank@NUS Repository. https://doi.org/10.1371/journal.pone.0095429 | Rights: | Attribution 4.0 International | Abstract: | Cylindrical or taper-and-cylinder combination optical fiber probe based on evanescent wave has been widely used for immunofluorescence biosensor to detect various analytes. In this study, in contrast to the contradiction between penetration depth and analyte diameter of optical fiber probe-based evanescent wave, we demonstrate that double-taper optical fiber used in a radiation wave-based all-fiber immunofluorescence biosensor (RWAIB) can detect micron-scale analytes using Escherichia coli O157:H7 as representative target. Finite-difference time-domain method was used to compare the properties of evanescent wave and radiation wave (RW). Ray-tracing model was formulated to optimize the taper geometry of the probe. Based on a commercial multi-mode fiber, a double-taper probe was fabricated and connected with biosensor through a "ferrule connector" optical fiber connector. The RWAIB configuration was accomplished using commercial multi-mode fibers and fiber-based devices according to the "all-fiber" method. The standard sample tests revealed that the sensitivity of the proposed technique for E. coli O157:H7 detection was 103 cfu·mL-1. Quantitation could be achieved within the concentration range of 103 cfu·mL -1 to 107 cfu·mL-1. No non-specific recognition to ten kinds of food-borne pathogens was observed. The results demonstrated that based on the double-taper optical fiber RWAIB can be used for the quantitative detection of micron-scale targets, and RW sensing is an alternative for traditional evanescent wave sensing during the fabrication of fiber-optic biosensors. © 2014 Zhang et al. | Source Title: | PLoS ONE | URI: | https://scholarbank.nus.edu.sg/handle/10635/161413 | ISSN: | 1932-6203 | DOI: | 10.1371/journal.pone.0095429 | Rights: | Attribution 4.0 International |
Appears in Collections: | Staff Publications Elements |
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