Liquid chromatography/electrospray tandem mass spectrometry method for the determination of cefuroxime in human plasma: application to a pharmacokinetic study.

A rapid, selective and sensitive high performance liquid chromatography-tandem mass spectrometry method (LC-MS/MS) was developed and validated for the determination and pharmacokinetic investigation of cefuroxime in human plasma. Cefuroxime and the internal standard (IS), cefoxitin, were extracted from plasma samples using solid phase extraction with Oasis HLB cartridges. Chromatographic separation was performed on a LiChrospher 60 RP Select B column (125 mm x 4 mm i.d., 5 microm particle size) using acetonitrile:5+/-0.2 mM ammonium acetate solution:glacial acetic acid (70:30:0.020, v/v/v) as the mobile phase at a flow rate of 0.8 mL/min. Detection of cefuroxime and cefoxitin was achieved by tandem mass spectrometry with an electrospray ionization (ESI) interface in negative ion mode. The calibration curves were linear over the range of 81.0-15976.2 ng/mL with the lower limit of quantitation validated at 81.0 ng/mL. The intra- and inter-day precisions were within 7.6%, while the accuracy was within +/-6.3% of nominal values. No matrix effect was observed in this method. The validated LC-MS/MS method was successfully applied for the evaluation of pharmacokinetic and bioequivalence parameters of cefuroxime after an oral administration of 500 mg cefuroxime tablet to 36 healthy male volunteers.