The Spectroscopy Study of the Binding of an Active Ingredient of Dioscorea Species with Bovine Serum Albumin with or without Co²⁺ or Zn²⁺

Figure 11

The analysis of the Trp side chains of (a) free BSA; (b) DIO-BSA system; (c) DIO-BSA-Co²⁺ system; (d) DIO-BSA-Zn²⁺ system. The experimental spectra (black dots), the fitting curves (solid line).

(a)

(b)

(c)

(d)