Fig. 7

The absorption spectra of CAT (a, b) and SOD (c, d) in the presence of AgNPs (a, c) or Ag⁺ (b, d) at different concentrations. Condition: T = 298 K; pH 7.4; a, b C(CAT) = 5×10⁻⁷ mol/L; C(AgNPs/Ag⁺, × 10⁻⁶ g/mL), a–d: 0.2, 0.4, 0.6, 0.8; c, d C(SOD) = 5×10⁻⁷ mol/L; C(AgNPs/Ag⁺, × 10⁻⁶ g/mL), a–e: 2, 4, 6, 8, 10