Determination of L-Cysteine Based on Energy Transfer between Cu2-xSe Nanoparticles and Rhodamine B

In this work, a turn on-off fluorescence assay for L-cys was developed based on the energy transfer between Cu2-xSe nanoparticles and thRhodamine B, wherein Cu2-xSe nanoparticles acted as energy receptor to quench Rhodamine B fluorescence, but L-cys was capable of recovering the quenched fluorescence. This method is demonstrated to be rapid and selective.