Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 406, Issue 1, Pages 183-192Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-013-7437-5
Keywords
Dielectrophoresis; Escherichia coli; Bioanalytical methods; Electrokinetic separations; Microfluidics
Funding
- NIAID NIH HHS [R03 AI099740] Funding Source: Medline
- NIBIB NIH HHS [R21 EB010191] Funding Source: Medline
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Bacteria play a significant role in both human health and disease. An estimated 9.4 million cases of foodborne illness occur in the United States each year. As a result, rapid identification and characterization of microorganisms remains an important research objective. Despite limitations, selective culturing retains a central role among a cadre of identification strategies. For the past decade, separations-based approaches to rapid bacterial identification have been under investigation. Gradient insulator dielectrophoresis (g-iDEP) promises benefits in the form of rapid and specific separation of very similar bacteria, including serotypes of a single species. Furthermore, this approach allows simultaneous concentration of analyte, facilitating detection and downstream analysis. Differentiation of three serotypes or strains of Escherichia coli bacteria is demonstrated within a single g-iDEP microchannel, based on their characteristic electrokinetic properties. Whole cells were captured and concentrated using a range of applied potentials, which generated average electric fields between 160 and 470 V/cm. Bacteria remained viable after exposure to these fields, as determined by cellular motility. These results indicate the potential g-iDEP holds in terms of both separatory power and the possibility for diagnostic applications.
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