A novel single-labeled fluorescent oligonucleotide probe for silver(I) ion detection based on the inherent quenching ability of deoxyguanosines

A novel single-labeled fluorescent oligonucleotide (OND) probe for the detection of nanomolar silver(I) ion in aqueous solution is developed based on the inherent quenching ability of deoxyguanosines. The formation of a hairpin structure of the OND-Ag+ complex brings deoxyguanosines close to a dye, leading to a decreased fluorescence intensity of the dye owning to photoinduced electron transfer from the dye to deoxyguanosines.