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• W4210610880 endingPage "339566" @default.
• W4210610880 startingPage "339566" @default.
• W4210610880 abstract "Highly rigid and versatile functionality of DNA tetrahedron nanostructures is often used in biosensing systems as a potential detection technique. In this work, a signal on-off fluorescence sensor based on the self-assembly DNA tetrahedron was developed for the rapid simultaneous detection of ochratoxin A (OTA) and aflatoxin B1 (AFB1). The fluorophore labeled DNA tetrahedron as probe was successfully synthesized via a simple denaturing annealing, the distance between fluorophore and quencher was regulated according to the change of hairpin structure on the tetrahedron. The fluorescence intensity of Cy3 decreased significantly in the presence of OTA, while the fluorescence intensity of Cy5 kept almost unchanged. And the fluorescence intensity of Cy5 decreased significantly in the presence of AFB1, while the fluorescence intensity of Cy3 kept almost unchanged. In the present of OTA and AFB1, the fluorescence intensity of Cy3 and Cy5 showed decreased significantly simultaneously, indicating the fluorescence sensor can be applied to simultaneous detect OTA and AFB1. Hence, the quantitative analysis of OTA and AFB1 was performed indirectly by the fluorescence intensity changes. The limits of detection (LOD) are as low as 0.005 ng/mL for OTA and 0.01 ng/mL for AFB1. In addition, the novel DNA tetrahedron-based fluorescence sensor possessed a universal applicability, which could be well applied in corn and wine." @default.
• W4210610880 created "2022-02-08" @default.
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• W4210610880 date "2022-03-01" @default.
• W4210610880 modified "2023-10-17" @default.
• W4210610880 title "A signal on-off fluorescence sensor based on the self-assembly DNA tetrahedron for simultaneous detection of ochratoxin A and aflatoxin B1" @default.
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• W4210610880 doi "https://doi.org/10.1016/j.aca.2022.339566" @default.
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