Microwave-assisted synthesis and simultaneous electrochemical determination of dopamine and paracetamol using ZIF-67-modified electrode

Abstract

In the present research, zeolitic imidazolate framework-67 (ZIF-67) was synthesized through a microwave-assisted method and used as an electrode modifier for simultaneous determination of dopamine (DPM) and paracetamol (PRA). The as-prepared materials were characterized by X-ray diffractometry, scanning electron microscopy, nitrogen adsorption/desorption isotherms, and X-ray photoelectron spectroscopy. It was found that the proposed microwave-assisted approach required a short synthesis time and provided the ZIF-67 with excellent textural properties and high yield rate as compared to conventional hydrothermal processes. The as-synthesized ZIF-67 possessed excellent textural properties and manifested a superior electrocatalytic activity toward the oxidation of PRA and DPM. The electrochemical oxidation of DPM and PRA was investigated by both cyclic voltammetry and differential pulse voltammetry. The ZIF-67 modified electrode caused electrocatalytic oxidation of DPM and PRA in a linear response range from 2.0 × 10−6 to 22 × 10−6 M with the detection limits of 1.3 × 10−6 M and 1.4 × 10−6 M, respectively. A proposed method was successfully applied to analyze DMP and PRA in pharmaceutical preparations.