Novel screen printed potentiometric sensors for the determination of oxicams

Abstract

The construction and performance characteristics of new sensitive and selective sensors based on functionalized multi-walled carbon nanotubes/β-cyclodextrin nanocomposite (FMWCNTs/β-CD) was demonstrated for potentiometric determination of different anti-inflammatory agents including lornoxicam, meloxicam, piroxicam and tenoxicam. Screen printed sensors (SPEs) modified with FMWCNTs/β-CD composite, hyamine (Hy) and 2-fluorophenyl 2-nitrophenyl ether (f-PNPE) showed proper electroanalytical performances with a Nernstian compliance range between 61.2 and 52.6 mV decade⁻¹ activity and a detection limit of 6.0 × 10⁻⁷ mol L⁻¹ for different oxicam derivatives. Modification with carbon nanotube composite as sensing material remarkably improved the potential stability and lifetime of the fabricated sensors. The proposed sensors offer a simple analytical tool for determination of different oxicam derivatives in their pharmaceutical formulations under batch and flow injection analysis (FIA) conditions.