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• W2783456355 startingPage "1249" @default.
• W2783456355 abstract "Electrochemical DNA biosensors composed of a redox marker modified nucleic acid probe tethered to a solid electrode is a common experimental construct for detecting DNA and RNA targets, proteins, inorganic ions, and even small molecules. This class of biosensors generally relies on the binding-induced conformational changes in the distance of the redox marker relative to the electrode surface such that the charge transfer is altered. The conventional design is to attach the redox species to the distal end of a surface-bound nucleic acid strand. Here we show the impact of the position of the redox marker, whether on the distal or proximal end of the DNA monolayer, on the DNA interface electrochemistry. Somewhat unexpectedly, greater currents were obtained when the redox molecules were located on the distal end of the surface-bound DNA monolayer, notionally furthest away from the electrode, compared with currents when the redox species were located on the proximal end, close to the electrode. Our results suggest that a limitation in ion accessibility is the reason why smaller currents were obtained for the redox markers located at the bottom of the DNA monolayer. This understanding shows that to allow the quantification of the amount of redox labeled target DNA strand that hybridizes to probe DNA immobilized on the electrode surface, the redox species must be on the distal end of the surface-bound duplex." @default.
• W2783456355 created "2018-01-26" @default.
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• W2783456355 date "2018-01-18" @default.
• W2783456355 modified "2023-10-14" @default.
• W2783456355 title "Dual Signaling DNA Electrochemistry: An Approach To Understand DNA Interfaces" @default.
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• W2783456355 doi "https://doi.org/10.1021/acs.langmuir.7b02787" @default.
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