*2.7. Selective Adsorption on the RCMs and RPMs*

To evaluate the selective adsorption on the RCMs and RPMs, the adsorption tests were carried out at different solutions (0.10 mg/mL dencichine, 0.10 mg/mL glycine-DLleucine (GL), 0.10 mg/mL glycyl-L-phenylalanine (GP)). An aqueous GL solution with concentration of 0, 0.06, 0.08, 0.10, 0.12, 0.14, 0.16 mg/mL was prepared. The concentrations of different solutions were measured at 200 nm (GL) using HPLC (Agilent Technologies, La Jolla, CA, USA). The standard curve was represented by the following Equation (5).

$$\mathbf{A}\_2 = 4251.53 \mathbf{C}\_2 - 0.4393 \tag{5}$$

Here, A2 represents the absorption peak area of GL solution at 200 nm, C2 represents the concentration of different GL standards (mg/mL) and the correlation coefficient (R2) for this equation was 0.9999.

An aqueous GP solution with a concentration of 0, 0.06, 0.08, 0.10, 0.12, 0.14, 0.16 mg/mL was prepared. The concentrations of different solutions were measured at 210 nm (GP) using HPLC (Agilent Technologies, La Jolla, CA, USA). The standard curve is represented by the following Equation (6).

$$\mathbf{A}\_3 = 7873.23\mathbf{C}\_3 - 4.6747\tag{6}$$

Here, A3 represents the absorption peak area of GP solution at 210 nm, C3 represents the concentration of different GP standards (mg/mL) and the correlation coefficient (R2) for this equation was 0.9999.
