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- W1985454080 abstract "In this report, we demonstrate a label-free genosensor based on DNA hairpins coupled to gold coated sensor surfaces. The hairpin probes were labeled with a thiolated moiety for immobilization at the 5' end and with a fluorophore for signal transduction at the 3' end. In the absence of the complement, the fluorophore is quenched by energy transfer to the gold surface. Addition of the target sequence leads to the hairpin unfolding, and releases the fluorescent signal. This built-in property, using a gold film as both the immobilizing substrate and quenching agent, has the advantage of simplicity in design and ease of further integration. Our results showed that lengths of both the stem and the loop structures have significant effects on the sensor performance. Hybridization kinetics was investigated for various probe/target lengths and concentrations. An optimized hairpin probe gave a fluorescent signal increase of 39 folds after hybridization, which is much higher than the earlier reported results. A limit of detection (LOD) down to 0.3 nM for the complementary target DNA detection has been achieved. The developed sensor was further successfully applied for the detection of single-base mismatch targets, as well as for the direct detection of PCR products." @default.
- W1985454080 created "2016-06-24" @default.
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- W1985454080 date "2011-03-01" @default.
- W1985454080 modified "2023-09-25" @default.
- W1985454080 title "Label-free genosensor based on immobilized DNA hairpins on gold surface" @default.
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- W1985454080 doi "https://doi.org/10.1016/j.bios.2010.12.008" @default.
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