Evaluation of a microwire sensor functionalized to detect Escherichia coli bacterial cells

Biosensors & Bioelectronics
Lin Lu, Soojin Jun

Abstract

A functionalized microwire sensor based on dielectrophoresis (DEP) and antigen-antibody reaction was initially developed for sensitive and selective detection of E. coli O157:H7. The dynamics of gold-tungsten microwires were manipulated using an automated X-Y-Z stage and the sensing process included antibody immobilization and bacterial detection, and cell quantification. Antibodies were first immobilized on surface of the microwire to improve sensing specificity, and then coupled with DEP for capture of E. coli cells in a mixture of E. coli cells and non-conductive polystyrene beads. Afterward, fluorescein-conjugated secondary antibodies were applied to the wire for quantification of captured bacteria. Field Emission Scanning Electron Microscope (FESEM) figures and fluorescence intensities of bacteria on the wire validated the sensing mechanism. The entire immobilization and detection procedure could be completed within 30 min with simple operations. Performance of the microwire sensor was not significantly affected when conducted in orange juice. In addition, the detection limit of this sensor was about 5 bacterial cells per microwire in 1000 CFU/mL bacterial suspensions when the electric field generated at 3 MHz and 20 peak ...Continue Reading

References

Mar 28, 2007·Analytica Chimica Acta·Lisa C Shriver-LakeChris R Taitt
Dec 12, 2007·Electrophoresis·Blanca H Lapizco-Encinas, Marco Rito-Palomares
Aug 23, 2008·Journal of Industrial Microbiology & Biotechnology·Jung-Tang HuangShiuh-Bin Fang
Sep 20, 2008·Biosensors & Bioelectronics·Dimitris KyprianouSergey A Piletsky

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Citations

Jan 4, 2017·Journal of Microbiological Methods·Robert S Burlage, Joshua Tillmann
Dec 2, 2014·Biosensors & Bioelectronics·Marisa ManzanoPatrizia Melpignano
Feb 23, 2017·Veterinary Research·Jasmina VidicNicole Jaffrezic-Renault
Jul 9, 2016·Macromolecular Rapid Communications·Patrick WünnemannAlexander Böker

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