A Sensitive Fluorescence Biosensor for Silver Ions (Ag⁺) Detection Based on C-Ag⁺-C Structure and Exonuclease III-Assisted Dual-Recycling Amplification

Figure 5

Selectivity of the biosensor. Experimental conditions: 10 nmol/L oligo-1, 40 nmol/L oligo-2, 10 U Exo III, 50 mmol/L K⁺, 160 nmol/L NMM, and 50 min incubation time. The concentration of Ag⁺ was 1.5 nmol/L, and the concentrations of other metal ions were 15 nmol/L. Error bars represent the standard deviation of three independent experiments.