Fig. 2. Fluorescence images (A) and intensity (D) of the immobilized FITC-IgG (1 mg mL⁻¹) spots prepared by using different copolymers (25 mg mL⁻¹) in PBS (10 mM). Fluorescence images (B) and intensity (E) of immobilized FITC-IgG (1 mg mL⁻¹) spots prepared by using PSMBDA₃₀ (25 mg mL⁻¹) in different PBS concentrations, respectively. Fluorescence images (C) and intensity (F) of immobilized FITC-IgG (1 mg mL⁻¹) spots prepared by using different PSMBDA₃₀ concentrations in PBS (10 mM), respectively.