(A) The RLS spectra of hTf at varying concentrations of ROP. [hTf] = 3.8 × 10−3 mM; (B) The RLS spectra of hTf at different concentrations of ASA. [hTf] = 3.8 × 10−3 mM, pH 7.4; (C) A plot of the ∆IRLS intensity of hTf at various concentrations of ROP in the absence and presence of ASA. [hTf] = 3.8 × 10−3 mM, and [ASA] = 4.62 × 10−3 mM for the ternary system. (○) binary system, (●) ternary system; (D) A plot of the ∆IRLS intensity of hTf at several concentrations of ASA in the absence and presence of ROP. [hTf] = 3.8 × 10−3 mM, and [ROP] = 1.33 × 10−5 mM for the ternary system. (∆) binary system, (▲) ternary system. All experiments were performed under identical conditions, T = 298 K, pH = 7.4.