*3.9. Leaching Assays*

PVC-coated plates (3.5 × 6 cm) with the developed PU and PDMS polymeric coating systems, with or without immobilized GAP, were submerged in ASW for a period of 45 days, using a prior optimized stirring method [36]. The average pH of the ASW during the tests was around 8 ± 0.3, and the temperature ranged from 18 to 21 ◦C. The obtained leaching water samples were further collected for IP-RP-HPLC analysis.
