ArticleJournal of fluorescence2025
A Facile Ratiometric Fluorescent Biosensor Using Blue-emitting Carbon Dots and Acriflavine for Quantitative Detection of DNA.
Article in Journal of fluorescence, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Carbon dots (CDs)-based ratiometric fluorescence strategies have attracted considerable attention. In this study, we developed a facile ratiometric fluorescent biosensor for DNA detection by utilizing the blue-emitting carbon dots (BCDs) as the fluorophore and acriflavine (AF), a fluorescent biological stain reagent, as both the response and recognition molecules. When AF was added, the fluorescence of BCDs decreased effectively and accompanied by a hypsochromic shift from 448 to 425 nm, whereas the fluorescence of AF at about 500 nm appeared due to the synergistic effect of Förster resonance energy transfer (FRET) and the inner filter effect (IFE) between the BCDs and AF. In the presence of DNA, the intercalative binding of AF into the DNA helix resulted in the fluorescence quenching of AF and the fluorescence restoration of BCDs at the same time. Therefore, the quantitative detection of DNA can be carried out vis evaluating the fluorescence intensity ratio of F
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