Fig. 1. (a) Absorbance and (b and c) fluorescence spectra of SA-HCy-1 (black line), SA-HCy-1 incubated with 100 μM ClO⁻ (blue line), SA-HCy-1 incubated with 100 mU mL⁻¹ β-gal (red line), and SA-HCy-1 incubated with 100 mU mL⁻¹ β-gal and 100 μM ClO⁻ (green line) in 10 mM PBS of pH 8.0. [SA-HCy-1] = 10 μM, λ_ex = 360 nm for (b) and λ_ex = 600 nm for (c).