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Metal ion selectivity of DA-ZP1-TPP. Average normalized fluorescence intensities for a 1.1 μM solution of DA-ZP1-TPP in buffer (50 mM PIPES, 100 mM KCl; pH 7) at 25 °C, after addition of 50 µM–2 mM concentrations of various metal ions (white bars), followed by addition of 50 µM ZnCl2 (black bars). The gray column represents the average sensor intensity after addition of 100 μM EDTA. Data were normalized to initial measured emission intensity.
