Fe3O4@SiO2-NH2/CoSB Modified Carbon Paste Electrode for Simultaneous Detection of Acetaminophen and Chlorpheniramine

In this work, a cobalt Schiff base complex (CoSB) immobilized at the surface of Fe3O4@SiO2‐NH2 nanoparticles was synthesized and characterized using different characterization techniques such as Scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD). The prepared nanocomposite (Fe3O4@SiO2-NH2/CoSB) was applied as a sensitive modifier in carbon paste electrode (CPE) for simultaneous determination of acetaminophen (AC) and chlorpheniramine (CP). The Fe3O4@SiO2-NH2/CoSB/CPE exhibited good electrochemical response towards the detection of AC and CP. In addition, an excellent separation between the voltammetric signals for these analytes at the surface of modified electrode was observed. The suggested method was effectively employed for concentration variation studies of a mixture containing these drugs. The dynamic linear ranges of 5.0 × 10−7 to1.0 × 10^−3 M and 8.0 × 10^−6 to 1.0 × 10^−3 M with detection limits 4.0 × 10^-7 M and 5.0 × 10^-6 M (for S/N = 3) were achieved for AC and CP, respectively. The performance of the presented electrochemical nanosensor was assessed by quantifying the two drugs in spiked human blood serum and in tablets.