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• W4211082835 endingPage "1356" @default.
• W4211082835 startingPage "1348" @default.
• W4211082835 abstract "Ethanolamine is an important analyte for environmental chemistry and biological sciences. A few DNA aptamers were previously reported for binding ethanolamine with a dissociation constant (Kd) as low as 9.6 nM. However, most of the previous binding assays and sensing work used either immobilized ethanolamine or immobilized aptamers. In this work, we studied three previously reported DNA sequences, two of which were supposed to bind ethanolamine while the other could not bind. Isothermal titration calorimetry revealed no binding for any of these sequences. In addition, due to their guanine-rich sequences, thioflavin T was used as a probe. Little fluorescence change was observed with up to 1 μM ethanolamine. Responses within the millimolar range of ethanolamine were attributed to the general fluorescence quenching effect of ethanolamine instead of aptamer binding. Finally, after studying the adsorption of ethanolamine to gold nanoparticles (AuNPs), we confirmed the feasibility of using AuNPs as a probe when the concentration of ethanolamine was below 0.1 mM. However, no indication of specific aptamer binding was observed by comparing the three DNA sequences for their color changing trends. This work articulates the importance of careful homogeneous binding assays using free target molecules." @default.
• W4211082835 created "2022-02-13" @default.
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• W4211082835 date "2022-01-01" @default.
• W4211082835 modified "2023-09-25" @default.
• W4211082835 title "Homogeneous assays for aptamer-based ethanolamine sensing: no indication of target binding" @default.
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• W4211082835 doi "https://doi.org/10.1039/d2an00145d" @default.
• W4211082835 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35244657" @default.
• W4211082835 hasPublicationYear "2022" @default.
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