Diagnostic approaches providing identification of phenotypes of pathogens directly from biofluids with improved figures of merit (fast, accurate (selective, sensitive), simple, low power, and cost-effective) is needed. A new, innovative microfluidic strategy that can contribute to this goal is presented here. The system can rapidly and selectively separate, isolate and concentrate pathogens from biofluids for direct identification or further assessments (immuno- or geno-recognition). The strategy is based on DC insulator gradient dielectrophoresis (DC-iGDEP) which provides not only the advantage of truly unique and non-linear separation of bioparticles, but also can remove unwanted components that are often present in complex biological samples and interfere with subsequent assays. The approach can fuse location to identification via electric field manipulation of bioparticles, thus avoiding a number of issues with current methods that require prior molecular recognition elements and commonly cold-chain reagents. The basis for the approach is a combination of dielectrophoretic and electrokinetic forces in a single channel. The system will be demonstrated by isolating and concentrating enterohemorrhagic strain designated E. coli serotype O157 in the presence of background flora and matrix. The long-term objective is to integrate DC-iGDEP into a simple, cost effective, reliable sensor that will be a component of a diagnostic platform that can be used in the clinical laboratory and ideally, amenable for surveillance and diagnosis in developing countries. The goal is to isolate/concentrate/separate pathogen particles from typical venipuncture and respiratory sample volumes. Once developed, the approach can be modified for a broad range of medically important pathogens.

Public Health Relevance

Developing an ability to isolate and concentrate pathogens from biofluids and materials using gradient dielectrophoresis. This can be developed into devices which can detect dangerous strains at earlier phases of infection providing for better care and reduced spread of infectious agents.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Small Research Grants (R03)
Project #
5R03AI099740-02
Application #
8437159
Study Section
Special Emphasis Panel (ZRG1-IDM-V (12))
Program Officer
Hall, Robert H
Project Start
2012-03-05
Project End
2015-02-28
Budget Start
2013-03-01
Budget End
2015-02-28
Support Year
2
Fiscal Year
2013
Total Cost
$68,609
Indirect Cost
$18,609
Name
Arizona State University-Tempe Campus
Department
Chemistry
Type
Schools of Arts and Sciences
DUNS #
943360412
City
Tempe
State
AZ
Country
United States
Zip Code
85287
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Staton, Sarah J R; Castillo, Josemar A; Taylor, Thomas J et al. (2013) Identifying indoor environmental patterns from bioaerosol material using HPLC. Anal Bioanal Chem 405:351-7
Woolley, Christine F; Hayes, Mark A (2013) Recent developments in emerging microimmunoassays. Bioanalysis 5:245-64