Journal
ANALYTICA CHIMICA ACTA
Volume 1232, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.aca.2022.340450
Keywords
Fluorescence resonance energy transfer; Polymer dots; Ratiometric fluorescence; miRNA-21 detection; Exonuclease III-Assisted amplification
Categories
Funding
- National Natural Science Foundation of China
- [21890741]
- [21827812]
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This study proposed a simple and sensitive method for ratiometric fluorescent detection of nucleic acids by controlling the pH-dependent adsorption of dye-labeled DNA on polymer dots. The method showed promising application in bioanalysis with excellent performance and good extendability.
This work proposed a simple and sensitive method for ratiometric fluorescent detection of nucleic acids via pH -dependent adsorption of dye-labeled DNA on polymer dots. The polymer dots (Pdots) could be conveniently prepared with nanoprecipitation in water. The mixture of dye-labeled DNA and Pdots at neutral pH showed the fluorescence of Pdots, while the adsorption of dye-labeled DNA on Pdots at acidic pH led to fluorescence reso-nance energy transfer from the Pdots to dye, and thus the fluorescence of dye. As a result, a signal switch could be designed for the detection of nucleic acids complementary to the DNA after combining with exonuclease III -assisted digestion of DNA. Using miRNA-21 as a target model and Cy3-labeled DNA as the probe, the hybridi-zation of DNA with miRNA-21 provided active sites for EXO III, which released the hybridized miRNA-21 for cyclic digestion of DNA, and thus decreased the adsorption of Cy3-labeled DNA on Pdots and the fluorescence of Cy3. The ratio of fluorescent intensity of Pdots to Cy3 showed linear increase upon increasing miRNA-21 con-centration ranging from 0.01 to 2.5 nM. The limit of detection at 3 sigma was 4.0 pM. The excellent performance and good extendability of the proposed strategy demonstrated its promising application in bioanalysis.
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