Solid phase extraction based on porous magnetic graphene oxide/β-cyclodextrine composite coupled with high performance liquid chromatography for determination of antiepileptic drugs in plasma samples

In this study, a novel solid phase extraction based on porous magnetic graphene oxide-cyclodextrin polymers (MGO-CD) was developed with aromatic linker and used for the simultaneous extraction and preconcentration of trace antiepileptic drugs in plasma. The characteristics of MGO-CD were assessed by Fourier transform infrared spectroscopy (FT-IR), Brunauer-Emmett-Teller surface areas (BET), Transmission Electron Microscope (TEM), Scanning Electron Microscope (SEM), X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). Magnetic cyclodextrin polymeric material exhibited a high specific surface area (187   m 2   g −1 ), large pore volume (0.12   cm 3   g −1 ), good saturated magnetization (37.68   emu   g −1 ), and excellent dispersibility in aqueous solution. Various parameters influencing the extraction recovery of drugs were studied. The method exhibited good linearity in the range of 1–50   μg   mL −1 , and the limit of quantitation of carbamazepine, phenytoin, diazepam was 11.89, 47.10 and 16.17   ng   mL −1 , respectively. The recoveries of three antiepileptic drugs range from 78.49 to 100.93% with relative standard deviations less than 5.5%. These analytical results demonstrated that the proposed approach based on MGO-CD was applicable for analysis of antiepileptic drugs in plasma samples.