(5,3) SWCNT-doping phosphorus-magnesium: Difference in adsorption of cardiovascular drugs.

The adsorption of hydrochlorothiazide and aspirin drugs onto a phosphorus (P) -magnesium (Mg) -doped (5,3) single-walled carbon nanotube (SWCNT) is investigated by density-functional theory (DFT) calculations using the Vienna Ab initio Simulation Package (VASP). The optimization of different structures indicates that the hydrochlorothiazide drug is stronger adsorbed than aspirin onto (5,3) SWCNT-P-Mg, affecting de release kinetics of the drugs. The results manifest the importance of the selected dopant atoms on the modification of the material surface in order to change the adsorption properties and the release conditions. We corroborate the results by means of electronic structure, density of states (DOS), frontier orbitals, and molecular electrostatic potential analysis.