Synthesis of a novel polymeric magnetic solid phase extraction adsorbent for selective extraction of amphetamine from urine samples coupled with high performance liquid chromatography

A novel pH-responsive block copolymer (Poly ethylene glycol-b-poly (N,N-dimethylaminoethylmethacrylate-co-maleic acid) was designed for the decoration and stabilization of magnetic nanoparticles (MNPs) as an efficient magnetic nano adsorbent for extraction of amphetamine (AM) from biological urine samples to be determined by high performance liquid chromatography-ultra violet detector (HPLC-UV). Full characterization of the synthesized polymeric magnetic nanoparticles (PMNPs) were followed by various techniques like Fourier transform infrared (FT-IR) spectroscopy, powder x-ray diffraction (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM). Important extraction parameters including pH, amount of sample volume, amount of adsorbent, type and amount of extraction organic solvent, time of extraction and desorption, agitation rate (rpm), and ionic strength of the extraction medium were studied and optimized. Under optimized extraction conditions, good linearity was observed in the concentration range of 30-2000ng/mL for AM. The amount of the q(e) was calculated as 0.18 (mg/g). The method was applied in determination of AM from positive urine samples with the recovery of 99.84%. Results indicated that the proposed method could be applied in clinical and forensic laboratories for simple, selective, and fast determination of AM from urine samples.