Development of a capillary flow microfluidic Escherichia coli biosensor with on-chip reagent delivery using water-soluble nanofibers |
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Authors: | Shengquan Jin Minhui Dai Bang-ce Ye Sam R Nugen |
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Affiliation: | 1. Department of Food Science, University of Massachusetts Amherst, Amherst, MA, USA 2. Lab of Biosystems and Microanalysis, State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, People’s Republic of China
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Abstract: | Although the potential role of microfluidics in point of care diagnostics is widely acknowledged, the practical limitations to their use still limit deployment. Here, we developed a capillary flow microfluidic with on-chip reagent delivery which combines a lateral flow assay with microfluidic technology. The horseradish peroxidase tagged antibody was electrospun in a water-soluble polyvinylpyrrolidone nanofibers and stored in a microfluidic poly(methyl methacrylate) chip. During the assay, the sample containing Escherichia coli on immunomagnetic beads came in contact with the nanofibers causing them to dissolve and release the reagents for binding. Following hybridization, the solution moved by capillary flow toward a detection zone where the analyte was quantified using chemiluminescence. The limit of detection was found to be approximately 106 CFU/mL of E. coli O157. More importantly, the ability to store sensitive reagents within a microfluidic as nanofibers was demonstrated. The fibers showed almost instant hydration and dissemination within the sample solution. |
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