Dexamethasone (dex)

PPy/DEX films were grown potentiostatically onto the device electrodes using a Bio-Logic SP-150 potentiostat. The electrosynthesis solution consisted of 0.2 M Pyrrole (Alfa Aesar, Ward Hill, MA) and 0.1 M DEX (Sigma-Aldrich, DEXamethasone 21 phosphate disodium, used as received) in Milli-Q water of 18 MΩ/cm resistivity. The film was synthesized by applying a constant potential of 1 V for 10 min between the device and a counter electrode. For drug release experiments, the counter and working electrodes were reversed. The amount of released DEX was quantified by absorbance at 242 nm (a characteristic band of DEX) using an infinite M200 Pro plate reader (TECAN).