Terbium ion-coordinated carbon dots for fluorescent aptasensing of adenosine 5′-triphosphate with unmodified gold nanoparticles

Abstract

This work reports on a novel time-resolved fluorescent aptasensing platform for the quantitative monitoring of adenosine 5'-triphosphate (ATP) by interaction of dispersive/agglomerate gold nanoparticles (AuNPs) with terbium ion-coordinated carbon dots (Tb-CDs). To construct such a fluorescent nanoprobe, Tb-CDs with high-efficient fluorescent intensity are first synthesized by the microwave method with terbium ions (Tb(3+)). The aptasensing system consists of ATP aptamer, AuNP and Tb-CD. The dispersive/agglomerate gold nanoparticles are acquired through the reaction of the aptamer with target ATP. Upon target ATP introduction, the aptamers bind with the analytes to form new aptamer-ATP complexes and coat on the surface of AuNPs to inhibit their aggregation in the high salt solution. In this case, the fluorescent signal of Tb-CDs is quenched by the dispersive AuNPs on the basis of the fluorescence resonance energy transfer (FRET). At the absence of target analyte, gold nanoparticles tend to aggregate in the high salt state even if the aptamers are present. Thus, the added Tb-CDs maintain their intrinsic fluorescent intensity. Experimental results indicated that the aptasensing system exhibited good fluorescent responses toward ATP in the dynamic range from 40nM to 4.0μM with a detection limit of 8.5nM at 3sblank criterion. The repeatability and intermediate precision is less than 9.5% at three concentrations including 0.04, 0.4 and 2.0μM ATP. The selectivity was acceptable toward guanosine 5'-triphosphate, uridine 5'-triphosphate and cytidine 5'-triphosphate. The methodology was applied to evaluate the blank human serum spiked with target ATP, and the recoveries (at 3 concentration levels) ranged between 97.0% and 103.7%. Importantly, this detection scheme is rapid, simple, cost-effective, and does not require extensive sample preparation or separation.

Determination of thiacloprid, thiamethoxam and imidacloprid in tea samples by quenching terbium luminescence

“…Terbium‐sensitized luminescence (TSL) detection, in which complexes between terbium and fluorescent organic compounds (the analytes) are formed, increasing the luminescence signal, has been the method of choice. The benefits of terbium in analytical chemistry have been previously reported, and its potential for development of nanoprobes and fluorescence optosensors has been demonstrated previously . Neonicotinoids, however, do not have natural fluorescence, so conventional TSL cannot be used.…”

Simultaneous Detection of Adenosine Triphosphate and Glucose Based on the Cu-Fenton Reaction

“…The fluorescence sensing strategy for ATP is usually developed according to the reaction between ATP and aptamer or between ATP and copper ions (Cu 2+ ). For example, ATP-aptamer complexes provided greater protection for gold nanoparticles (AuNPs) against salt-induced aggregation than either aptamer or ATP alone, and the dispersive AuNPs rather than aggregation could efficiently quench the fluorescence of Tb ion-functionalized carbon dots due to the fluorescence resonance energy transfer [ 10 ]. In addition, compared with other cations, ATP has a strong affinity for Cu 2+ , which can completely quench the emission of perylene diimide functionalized with histidine.…”

Fabrication and photoluminescent properties of Tb3+ doped carbon nanodots

“…Also, CNDs with Tb was used as an energy acceptor for dipicolinic acid detection and by Xu et al . 20 for detection of adenosine 5′-triphosphate as an energy donor in fluorescence resonance energy transfer (FRET). Addition of La, Tb or Eu ions to CNDs causes the appearance of metal ions PL and complete PL quenching of the CNDs, obtained in the multistep procedure in organic phase 21 .…”