A label-free fluorescent probe for the detection of adenosine 5 '-triphosphate via inhibiting the aggregation-induced emission enhancement of glutathione modified silver nanoclusters triggered by zinc ion

摘要

It is important to establish sensitive and simple analysis methods for adenosine 5'-triphosphate (ATP). A label-free fluorescent probe for the determination of ATP was constructed based on glutathione modified silver nanoclusters (AgNCs/GSH). AgNCs/GSH showed aggregation-induced emission enhancement (AIEE) property in the organic solvent. The effects of metal ions on the fluorescence of AgNCs/GSH were also studied. Only zinc ion enhanced the fluorescence of AgNCs/GSH obviously. This was because Zn2+ coordinated with AgNCs/GSH to cause the aggregation of AgNCs/GSH, which was sufficiently proved by TEM. With the addition of ATP, Zn2+ bound with ATP through Zn-O-P bond and the binding between Zn2+ and AgNCs/GSH was inhibited. Hence the fluorescence of AgNCs/GSHwas decreasedwith increasing the ATP concentration. The fluorescence response was linear in the ATP concentration range of 1-110 mu M, and the detection limitwas 0.8 mu M. Then this method was successfully applied for determining ATP in the samples of human urine and rat serum, the recoveries were in the range of 97.6%-103%. (C) 2019 Elsevier B.V. All rights reserved.