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- W2893365116 abstract "In terms of hybridization assays surface plasmon resonance imaging (SPRi) offers high throughput, label-free and real-time monitoring of the binding kinetics. This requires DNA microarrays on bare or modified gold SPRi chips, which are generally premade by an off-line microspotting procedure. Therefore, the surface density of the immobilized probes is not known although it is an essential quality control parameter, especially, when it can vary in a broad range as in case of self-assembled thiol-labeled DNAs on gold surface. Here we show that the small molecular weight ruthenium(III) hexamine complex (RuHex) introduced earlier for electrochemical quantitation of DNA coverage on gold electrodes can be used also in SPRi to assess the surface density of DNA probes in DNA microarrays. A single injection of RuHex solution allows the simultaneous visualization and quantification of the surface density of DNA probes (ranging in this study from 4 × 1011 to 1.7 × 1013 molecules cm−2) on all spots of a microarray made by microspotting thiol labeled short DNA probes both in prehybridized and single-stranded form on a gold SPRi chip. The methodology was applied to determine the effect of the surface density of DNA probes on the hybridization efficiency and kinetics of complementary microRNAs, using hsa-miR-208a-3p as model. Single mismatch duplexes were found to be more effectively destabilized than fully complementary duplexes by steric hindrance at large surface densities of the DNA probes, which offers an effective mean to increase single mismatch selectivity." @default.
- W2893365116 created "2018-10-05" @default.
- W2893365116 creator A5022203074 @default.
- W2893365116 creator A5037960192 @default.
- W2893365116 date "2019-01-01" @default.
- W2893365116 modified "2023-10-15" @default.
- W2893365116 title "Multiplexed assessment of the surface density of DNA probes on DNA microarrays by surface plasmon resonance imaging" @default.
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- W2893365116 doi "https://doi.org/10.1016/j.aca.2018.09.048" @default.
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