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Characterization of MgFe2O4 Nanoparticles as a Novel Electrochemical Sensor: Application for the Voltammetric Determination of Ciprofloxacin

A new sensor containing MgFe2O4 nanoparticles in modified multiwall carbon nanotubes (MgFe2O4-MWCNTs) was
prepared, and its electrochemical behavior was investigated. MgFe2O4-MWCNTs were used as a voltammetric sensor for
the electrocatalytic determination of ciprofloxacin. The synthesized materials were characterized by different methods
such as transmission electron microscopy (TEM), X-ray diffraction (XRD), cyclic voltammetry, and electrochemical
impedance spectroscopy. The MgFe2O4-MWCNTs electrode showed an oxidation peak potential at around 250 mV. The
immobilized composite films facilitate interfacial electron transfer and electrocatalytic activity on the oxidation of
ciprofloxacin. The oxidation peak current was dependent on the ciprofloxacin concentration, which was linear over the
range of 0.10 – 1000 μmol L–1 with a detection limit and quantification limit of 0.01 and 0.08 μmol L–1, respectively. The
relative standard deviation for the determination of 1.0 μmol L–1 ciprofloxacin was 1.1%. The repeatability of the sensor
was investigated by preparing nine similar electrodes. The proposed sensor is a selective and fast tool for the determination
of ciprofloxacin in tablet, plasma, and urine samples.
Journal Papers