Figure 5.

UV–visible studies of Fe²⁺ or Fe³⁺ chelating ability of deferiprone (DFP) in the absence or presence of 10 mM FeSO₄ (A) and FeCl₃ (B) and compounds NTZ-1006 (black line), NTZ-1032 (red line), and NTZ-1441 (blue line) before and after addition of 40 μL of 10 mM FeSO₄ (C), or FeCl₃ (D). Superposition UV–visible spectra were obtained by measurement of absorbance of compound alone (50 μM) and FeSO₄ or FeCl₃ without compound (both 130 μM) in DMSO 50%.