Abstract
A versatile nanocomposite was simply prepared based upon the electrostatic adsorption of positively charged gold nanoparticles with negatively charged graphene oxide (nano-gold@GO), and utilized as a novel fluorescence quenching platform for ultrasensitive detection of adenosine triphosphate (ATP). In the designed system, DNA-stabilized Ag nanoclusters (DNA/AgNCs) were used as fluorescent probes, DNA duplex was formed in the presence of ATP, and they can electrostatically adsorb onto the surface of nano-gold@GO to quench the fluorescence signal. Upon the addition of exonuclease III (Exo III), the DNA duplex would be hydrolyzed into DNA fragments and resulted in the recovery of the fluorescence signals due to the diffusion of AgNCs away from nano-gold@GO. Based on these, sensitive detection of ATP was realized with a detection range of 5.0 pM–20 nM. Notably, a good recovery in the range of 94–104% was obtained when detecting ATP in human serum samples, indicating a promising application value in early disease diagnosis.
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The authors wish to acknowledge the Natural Science Foundation of Xuzhou City (KC18140) and the project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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Written informed consent was obtained from the patient for research use. The study was approved by the Jiangsu Normal University ethics committee.
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Xue, N., Wu, S., Li, Z. et al. One-step and ultrasensitive ATP detection by using positively charged nano-gold@graphene oxide as a versatile nanocomposite. Anal Bioanal Chem 412, 2487–2494 (2020). https://doi.org/10.1007/s00216-020-02470-6
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DOI: https://doi.org/10.1007/s00216-020-02470-6