Novel and Complexes of Natural Product Tryptanthrin: Synthesis and Binding with G-Quadruplex DNA

Figure 3

UV-Vis absorption titration of complexes 1 and 2 in Tris/KCl buffer (100 mM KCl, 10 mM Tris-HCl, and pH 7.35) with a fixed compound concentration (2.0 10⁻³ M) and increasing the amounts of G4-HTG21 (1.0 10⁻⁵ M, 5 μL per scan).