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- W2012011961 abstract "Tagged, negatively charged, liposomes are used to amplify DNA sensing processes. The analyses of the target DNA are transduced electrochemically by using Faradaic impedance spectroscopy, or by microgravimetric measurements with Au-quartz crystals. By one method, a probe oligonucleotide (1) is assembled on Au-electrodes or Au-quartz crystals. The formation of the double-stranded assembly with the analyte DNA (2) is amplified by the association of the 3-oligonucleotide-functionalized liposomes to the sensing interface. The target DNA is analyzed by this method with a sensitivity limit that corresponds to 1 x 10(-12) M. A second method to amplify the sensing of the analyte involves the interaction of the 1-functionalized electrode or Au-quartz crystal with the target DNA sample (2) that is pretreated with the biotinylated oligonucleotide (4). The formation of the three-component double-stranded assembly between 1/2/4 is amplified by the association of avidin and biotin-labeled liposomes to the sensing interfaces. By the secondary association of avidin and biotin-tagged liposomes, a dendritic-type amplification of the analysis of the DNA is accomplished. The analyte DNA (2) is sensed by this method with a sensitivity limit corresponding to 1 x 10(-13) M. The biotin-tagged liposomes are also used to probe and amplify single-base mismatches in an analyte DNA. The 6-oligonucleotide-functionalized Au-electrode or Au-quartz crystal was used to differentiate the single-base mismatch (G) in the mutant (5) from the normal A-containing gene (5a). Polymerase-induced coupling of the biotinylated-C-base to the double-stranded assembly generated between 6 and 5 followed by the association of avidin and biotin-tagged liposomes is used to probe the single base mismatch. The functionalized liposomes provide a particulate building unit for the dendritic amplification of DNA sensing." @default.
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- W2012011961 date "2001-05-11" @default.
- W2012011961 modified "2023-09-27" @default.
- W2012011961 title "Electronic Transduction of DNA Sensing Processes on Surfaces: Amplification of DNA Detection and Analysis of Single-Base Mismatches by Tagged Liposomes" @default.
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- W2012011961 doi "https://doi.org/10.1021/ja0036256" @default.
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