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.
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.
|Crowther, Claire V; Hayes, Mark A (2017) Refinement of insulator-based dielectrophoresis. Analyst 142:1608-1618|
|Ding, Jie; Lawrence, Robert M; Jones, Paul V et al. (2016) Concentration of Sindbis virus with optimized gradient insulator-based dielectrophoresis. Analyst 141:1997-2008|
|Jones, Paul V; Hayes, Mark A (2015) Development of the resolution theory for gradient insulator-based dielectrophoresis. Electrophoresis 36:1098-106|
|Kenyon, Stacy M; Keebaugh, Michael W; Hayes, Mark A (2014) Development of the resolution theory for electrophoretic exclusion. Electrophoresis 35:2551-9|
|Jones, Paul V; DeMichele, Alexa F; Kemp, LaKeta et al. (2014) Differentiation of Escherichia coli serotypes using DC gradient insulator dielectrophoresis. Anal Bioanal Chem 406:183-92|
|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|
|Yanashima, Ryan; García, Antonio A; Aldridge, James et al. (2012) Cutting a drop of water pinned by wire loops using a superhydrophobic surface and knife. PLoS One 7:e45893|
|Castillo, Josemar A; Staton, Sarah J R; Taylor, Thomas J et al. (2012) Exploring the feasibility of bioaerosol analysis as a novel fingerprinting technique. Anal Bioanal Chem 403:15-26|
|Kenyon, Stacy M; Weiss, Noah G; Hayes, Mark A (2012) Using electrophoretic exclusion to manipulate small molecules and particles on a microdevice. Electrophoresis 33:1227-35|
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