Synthesis and Characterization of MIP Ghost Approach for Selective Extraction of Empagliflozin and Quantification by Liquid Chromatography.

The valid method was developed for analyzing empagliflozin in serum/plasma/urine using a molecularly imprinted ghost polymer-solid-phase extraction approach (MISPE) with liquid chromatographic methodology. Methacrylic acid (MAA) was used as the monomer, 2,2 azobis isobutyronitrile as the initiator and ethylene glycol dimethacrylate as the cross-linker in the free radical polymerization procedure. Empagliflozin was loaded onto the polymer and eluted with 1 mL of a 9:1 MeOH:acetic acid solution. The PRONTOSIL C8 (250 × 4 mm × 5u) was used to design the optimized HPLC technique. Phosphate buffer (pH -5): ACN (40:60) was used as the mobile phase with a flow rate of 0.8 mL/min, and 230 nm was used for detection. Empagliflozin's calibration curve is linear between 0.08 and 200 μg/mL. The thresholds for quantification (limit of quantification) and detection (limit of detection) were 0.002 and 0.006 μg/mL, respectively. High binding affinity and selectivity were displayed by the polymer, and, at pH 8, the polymer's rebinding efficiency was effective. It was discovered that the extraction recovery of the analyte employing the molecular-imprinted solid-phase extraction coupled with high-performance liquid chromatography developed technique was 93% with relative standard deviation (RSD) <2%.