Fig. 1. (a) Fluorescence spectra of 5.0 μM QClO upon the addition of HClO (0–24.4 μM). (b) Plot of the fluorescence intensity ratio (562 nm/492 nm) change of 5.0 μM QClOversus ClO– concentration (0–24.4 μM). (c) Linear relationship between the fluorescence intensity ratio and HClO concentration in the range of 0.8–12.5 μM. (d) Plot of the fluorescence intensity ratio of QClO as a function of HClO (10, 16, and 24 μM). The excitation wavelength was 426 nm in 10 mM PBS (pH = 7.4, containing 5% DMF) buffer solution.
