Sample concentration 0.5 g Allopurinol and 2.5 g of EC in 100ml DCM (Drug/coating material 1:5), EC-g-PNIPAM synthesized with 8 g/100mL of NIPAM Solvent DCM Carrier, Filmogen Ethylcellulose, Poly(N-isopropylacrylamide) (PNIPAM) thermo-sensitive polymer