A microchip-based endothelium mimic utilizing open reservoirs for cell immobilization and integrated carbon ink microelectrodes for detection |
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Authors: | Matthew K Hulvey R Scott Martin |
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Institution: | (1) Department of Chemistry, Saint Louis University, 3501 Laclede Avenue, St. Louis, MO 63103, USA |
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Abstract: | This paper describes the fabrication and characterization of a microfluidic device that utilizes a reservoir-based approach
for endothelial cell immobilization and integrated embedded carbon ink microelectrodes for the amperometric detection of extracellular
nitric oxide (NO) release. The design utilizes a buffer channel to continuously introduce buffer or a plug of stimulant to
the reservoir as well as a separate sampling channel that constantly withdraws buffer from the reservoir and over the microelectrode.
A steel pin is used for both the fluidic connection to the sampling channel and to provide a quasi-reference electrode for
the carbon ink microelectrode. Characterization of the device was performed using NO standards produced from a NONOate salt.
Finally, NO release from a layer of immobilized endothelial cells was monitored and quantified using the system. This system
holds promise as a means to electrochemically detect extracellular NO release from endothelial cells in either an array of
reservoirs or concurrently with fluorescence-based intracellular NO measurements. |
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Keywords: | Microchip Cell immobilization Electrochemistry Amperometric detection Endothelial cell |
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