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• W2000539038 abstract "Previous work has described several reagentless, electrochemical DNA (E-DNA) sensing architectures comprised of an electrode-immobilized, redox-tagged probe oligonucleotide. Recent studies suggest that E-DNA signaling is predicated on hybridization-linked changes in probe flexibility, which will alter the efficiency with which the terminal redox tag strikes the electrode. This, in turn, suggests that probe length, probe geometry, and redox-tag placement will affect E-DNA signaling. To test this we have characterized E-DNA sensors comprised of linear or stem-loop probes of various lengths and with redox tags placed either distal to the electrode or internally within the probe sequence (proximal). We find that linear probes produce larger signal changes upon target binding than equivalent stem-loop probes. Likewise, long probes exhibit greater signal changes than short probes provided that the redox tag is placed proximal to the electrode surface. In contrast to their improved signaling, the specificity of long probes is poorer than that of short probes, suggesting that sensor optimization represents a trade off between sensitivity and specificity. Finally, we find that sensor response time and selectivity are only minimally affected by probe geometry or length. The results of this comparative study will help guide future designs and applications of these sensors." @default.
• W2000539038 created "2016-06-24" @default.
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• W2000539038 date "2009-02-12" @default.
• W2000539038 modified "2023-10-03" @default.
• W2000539038 title "Effects of Probe Length, Probe Geometry, and Redox-Tag Placement on the Performance of the Electrochemical E-DNA Sensor" @default.
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• W2000539038 doi "https://doi.org/10.1021/ac802317k" @default.
• W2000539038 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19215066" @default.
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