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Biosensors 2015, 5(3), 562-576; doi:10.3390/bios5030562

The Detection of Helicobacter hepaticus Using Whispering-Gallery Mode Microcavity Optical Sensors

1
Department of Biochemistry, University of Missouri, Columbia, MO 65211, USA
2
Department of Bioengineering, University of Missouri, Columbia, MO 65211, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Yuliya Semenova
Received: 16 June 2015 / Accepted: 5 August 2015 / Published: 7 August 2015
(This article belongs to the Special Issue Optical Sensors for Biomedical Applications)
View Full-Text   |   Download PDF [479 KB, uploaded 7 August 2015]   |  

Abstract

Current bacterial detection techniques are relatively slow, require bulky instrumentation, and usually require some form of specialized training. The gold standard for bacterial detection is culture testing, which can take several days to receive a viable result. Therefore, simpler detection techniques that are both fast and sensitive could greatly improve bacterial detection and identification. Here, we present a new method for the detection of the bacteria Helicobacter hepaticus using whispering-gallery mode (WGM) optical microcavity-based sensors. Due to minimal reflection losses and low material adsorption, WGM-based sensors have ultra-high quality factors, resulting in high-sensitivity sensor devices. In this study, we have shown that bacteria can be non-specifically detected using WGM optical microcavity-based sensors. The minimum detection for the device was 1 × 104 cells/mL, and the minimum time of detection was found to be 750 s. Given that a cell density as low as 1 × 103 cells/mL for Helicobacter hepaticus can cause infection, the limit of detection shown here would be useful for most levels where Helicobacter hepaticus is biologically relevant. This study suggests a new approach for H. hepaticus detection using label-free optical sensors that is faster than, and potentially as sensitive as, standard techniques. View Full-Text
Keywords: H. hepaticus; sensors; microcavities; bacterial detection; optical transducing mechanisms H. hepaticus; sensors; microcavities; bacterial detection; optical transducing mechanisms
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Anderson, M.E.; O'Brien, E.C.; Grayek, E.N.; Hermansen, J.K.; Hunt, H.K. The Detection of Helicobacter hepaticus Using Whispering-Gallery Mode Microcavity Optical Sensors. Biosensors 2015, 5, 562-576.

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