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• W2085542022 endingPage "4961" @default.
• W2085542022 startingPage "4953" @default.
• W2085542022 abstract "Surface hybridization, a reaction in which nucleic acid molecules in solution react with nucleic acid partners immobilized on a surface, is widely practiced in life science research. In these applications the immobilized partner, or “probe”, is typically single-stranded DNA. Because DNA is strongly charged, high salt conditions are required to enable binding between analyte nucleic acids (“targets”) in solution and the DNA probes. High salt, however, compromises prospects for label-free monitoring or control of the hybridization reaction through surface electric fields; it also stabilizes secondary structure in target species that can interfere with probe−target recognition. In this work, initial steps toward addressing these challenges are taken by introducing morpholinos, a class of uncharged DNA analogues, for surface-hybridization applications. Monolayers of morpholino probes on gold supports can be fabricated with methods similar to those employed with DNA and are shown to hybridize efficiently and sequence-specifically with target strands. Hybridization-induced changes in the interfacial charge organization are analyzed with electrochemical methods and compared for morpholino and DNA probe monolayers. Molecular mechanisms connecting surface hybridization state to the interfacial capacitance are identified and interpreted through comparison to numerical Poisson−Boltzmann calculations. Interestingly, positive as well as negative capacitive responses (contrast inversion) to hybridization are possible, depending on surface populations of mobile ions as controlled by the applied potential. Quantitative comparison of surface capacitance with target coverage (targets/area) reveals a nearly linear relationship and demonstrates sensitivities (limits of quantification) in the picogram per square millimeter range." @default.
• W2085542022 created "2016-06-24" @default.
• W2085542022 creator A5021166773 @default.
• W2085542022 creator A5028812493 @default.
• W2085542022 creator A5039679140 @default.
• W2085542022 creator A5064852246 @default.
• W2085542022 date "2009-03-18" @default.
• W2085542022 modified "2023-10-18" @default.
• W2085542022 title "Morpholino Monolayers: Preparation and Label-free DNA Analysis by Surface Hybridization" @default.
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• W2085542022 doi "https://doi.org/10.1021/ja810051q" @default.
• W2085542022 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2730437" @default.
• W2085542022 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19296583" @default.
• W2085542022 hasPublicationYear "2009" @default.
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