*2.5. Selective Adsorption*

To evaluate the specific recognition ability of Bi-MIPs for chrysin, selective experiments were conducted with chloramphenicol and oxytetracycline as structural analogues. The Bi-MIPs were weighed (0.02 ± 0.0002 g) with an analytical balance and placed into a round of 50 mL conical flasks. After adding 20 mL of a solution of chrysin (1 mg/mL), chloramphenicol (1 mg/mL) and terramycin (1 mg/mL), it was adsorbed in an 80 rpm constant temperature oscillator at 25 ◦C. After the adsorption experiments, the Bi-MIPs were separated from the mixed solution by a centrifuge. The concentration in the supernatant was obtained by UV-vis absorbance. The selective adsorption ability of Bi-MIPs was obtained using the selectivity factors (α), which is shown in Equation (3).

$$\alpha = \frac{\mathbf{Q\_{Bi\text{-}MIPs}}}{\mathbf{Q\_{Bi\text{-}MIPs}}} \tag{3}$$
