Simple chemiluminescence aptasensors based on resonance energy transfer.

In the present work, two aptamer-based probes and related sensor systems were developed with chemiluminescence signaling. The detection was based on "turning-on" chemiluminescence with switching "off" of the resonance energy transfer after the aptamer's recognition of the target molecule. In this design, a DNA/aptamer duplex linked a chemiluminescence group and a gold nanoparticle together. Only low-intensity chemiluminescence was obtained due to the highly efficient resonance energy transfer. After introducting the target molecule, structure-switching took place with turning off the energy transfer; thus, a restoration and turning on of the chemiluminescence was obtained. The two designs differed in the chemiluminescence groups, since one was a covalently linked luminol molecule, while the other was a conjugated horseradish peroxidase for the catalysis of further chemiluminescence reactions. These schemes provided simple and effective sensing toward a model analyte, adenosine.