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• W2051838028 abstract "In the present study, we report a novel aptasensor based on silver nanoparticle enhanced fluorescence for the detection of adenosine. First, the distance dependence nature of silver nanoparticle enhanced fluorescence was investigated through fluorescent dyes modified oligonucleotides to control the spacing distance between dyes and AgNP. The results showed that the fluorescence intensity reached the maximum value with the spacing distance of dyes about 8 nm from AgNP surface. The fluorescence intensity decreases when the spacing distance is either above or below this value. Based on this result, a fluorescence switch is constructed. In the “OFF” state, without the target molecules, there is a greater spacing distance between the Cy3 dyes and the AgNP giving comparatively lower fluorescence intensity. While in the “ON” state, in the presence of target molecules, the fluorescence signals increased for the conformation structure change of the aptamer which shorten the spacing distance between the Cy3 dyes and the AgNP to 8 nm. Using adenosine as target, the aptasensor produced a linear range from 200 nM to 200 μM with a correlation coefficient of 0.9949 and the detection limit was 48 nM estimated using 3σ. The aptasensor was also found to be specific in targeting adenosine. The presented method shows a new strategy of combining aptamer recognition and silver nanoparticle for fluorescence signal enhancement and increasing sensitivity." @default.
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• W2051838028 date "2012-02-01" @default.
• W2051838028 modified "2023-10-16" @default.
• W2051838028 title "A novel aptasensor based on silver nanoparticle enhanced fluorescence" @default.
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• W2051838028 doi "https://doi.org/10.1016/j.bios.2011.11.030" @default.
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