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Based on the disruption and recovery of fluorescence of styryl quinolinium (SQ) dye/G-quadruplex complex, a label-free method for dual-channel detection of Ag + and cysteine is developed. The above sensing system exhibits high sensitivity and good selectivity for Ag + , even in the presence of other metal ions (such as Na + , Mg 2+ , Mn 2+ , Ba 2+ ,...
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