A Multi-Wall Carbon Nanotubes-Dicetyl Phosphate Electrode for the Determination of Hypoxanthine in Fish

Abstract

An enzymeless sensor based on a multi-walled carbon nanotubes-dicetyl phosphate (MWCNT-DCP) film modified vitreous carbon electrode was developed for the determination of hypoxanthine. The MWCNT-DCP film modified electrode showed a remarkable enhancement effect on the oxidation peak current of hypoxanthine. Under the optimized conditions, the oxidation peak current is proportional to the concentration of hypoxanthine over the range from 5.0 × 10^-7 to 2.0 × 10^-4 mol L^-1 with a detection limit (S/N = 3) of 2.0 × 10^-7 mol L^-1. The MWCNT-DCP film modified electrode has been successfully used to detect hypoxanthine in fish samples.