Sensitive fluorescence detection of ATP based on host-guest recognition between near-infrared β-Cyclodextrin-CuInS2 QDs and aptamer

Publication date: 1 April 2017
Source:Talanta, Volume 165
Author(s): Tianyu Hu, Weidan Na, Xu Yan, Xingguang Su
We have developed a near-infrared (NIR) fluorescent aptamer-based sensor for sensitive detection of adenosine-5′-triphosphate (ATP) by using a ATP-binding aptamer and β-Cyclodextrin-CuInS2 quantum dots (β-CD-CuInS2 QDs). The fluorescence of β-CD-CuInS2 QDs has a slight enhancement with the addition of ATP-binding aptamer due to the host-guest recognition between aptamer and β-CD. When ATP is added, it will bind to aptamer to form G-quadruplexes. Aptamer-ATP complexes can enter into the hydrophobic cavities of β-CD and result in great enhancement of the fluorescence intensity. Under the optimum conditions, the fluorescence intensity of β-CD-CuInS2 QDs is proportional to the concentration of ATP, which shows a good linear response toward ATP concentration range of 6–1200μmolL⁻¹, the detection limit for ATP is 3μmolL⁻¹. The present assay shows a good selectivity for ATP over other biologically important proteins, and it is applied to the determination of ATP in human serum sample with satisfactory results.

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