Products of Sulfide/Selenite Interaction Possess Antioxidant Properties, Scavenge Superoxide-Derived Radicals, React with DNA, and Modulate Blood Pressure and Tension of Isolated Thoracic Aorta

Figure 2

Effect of the SeO₃²⁻ and H₂S concentration on the reduction of ^⋅cPTIO. (a) Effect of the SeO₃²⁻ concentration (1-400 μmol L⁻¹) on the reduction of ^⋅cPTIO (100 μmol L⁻¹) in the presence of H₂S (100 μmol L⁻¹). Arrow indicates the 1 : 4 molar ratio of SeO₃²⁻ : H₂S. (b) Effect of the H₂S concentration (0-200 μmol L⁻¹) on the reduction of ^⋅cPTIO (100 μmol L⁻¹) in the presence of SeO₃²⁻ (100 μmol L⁻¹). The reduction of ^⋅cPTIO was evaluated as the decrease of the absorbance at 560 nm after 2.25 min of the reaction (pH 7.4, 37°C). All values represent the , .

(a)

(b)