Development of a LC-MS/MS method for the determination of levofloxacin in plasma from pediatric patients and validation of its clinical value
J Objective To develop and validate a liquid chromatography-tandem mass spectrometry method for determining levofloxacin in plasma sample from pediatric patients.Method This is a prospective,observational study.The clinical residual plasma samples from healthy individuals for physical examination in Children's Hospital Affiliated to Zhengzhou University were collected as blank matrix.Plasma samples from five pediatric patients who did not receive levofloxacin or ciprofloxacin in the department of Respiration were collected for methodological evaluation.In addition,34 clinical plasma samples from 22 pediatric patients(9 males and 13 females;mean age(8.1±3.7)years)using levofloxacin was collected,and their plasma concentrations were determined.Using ciprofloxacin as the internal standard,levofloxacin in plasma samples was quantified by liquid chromatography-tandem mass spectrometry following protein precipitation using acetonitrile.A C18 column(Shim-pac GIST-HP C18,2.1 mmx100 mm,3 μm)and mobile phase composed of water(containing 0.1％formic acid)and acetonitrile(containing 0.1％formic acid)with gradient elution at a flow rate of 0.4 ml/min were used to separate levofloxacin.The column temperature was 40 ℃,injection volume was 1 μl and the total analysis time was 9 min.Levofloxacin and ciprofloxacin were ionized with an ESI source in positive ion mode and detected in multiple reaction monitoring(MRM)mode.The detected ions of levofloxacin and ciprofloxacin were m/z 362.10→318.1 and 332.15→231.05,respectively.The method's specificity,sensitivity,linearity,precision,accuracy,recovery rate,stability,matrix effect,and carry-over were validated.All statistical analyses were performed with SPSS statistical software(version 17.0).The normality of the data was detected by the K-S test.A P＜0.05 was considered statistically significant for two tailed tests.Results The LC-MS/MS method showed a good linearity within the range of 0.062 5-20 mg/L,with the lower detection limit of levo floxacin of 0.062 5 mg/L.The calibration curve for levofloxacin was Y=0.093X+0.010(R2＞0.99).Under different quality control levels,the accuracy ranged from 92.57％to 104.39％,and the intra-day and inter-day imprecision ranged from 2.32％to 9.35％.These values were not affected by the normal matrix,5％hemolysis matrix and 15％hyperlipidemia matrix.Furthermore,the levofloxacin plasma samples were stable in the short term.A total of 34 plasma samples from 22 patients were collected and analyzed.Only 2 plasma samples were below the lower limit of quantification,while the other plasma concentrations of levofloxacin were ranged from 0.091 to 6.755 mg/L.Cmax was(5.52±1.09)mg/L.Conclusion The LC-MS/MS method meets the requirements of the reference method and requires a small sample size(50 μl),making it suitable for the determination of levofloxacin in plasma from pediatric patients.
LevofloxacinPediatric patientsTherapeutic drug monitoringLiquid chromatography-tandem mass spectrometry
万方数据
维普
