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A Validated LC-MS/MS Method for the Determination of Mezlocillin in Plasma: An Adapted Method for Therapeutic Drug Monitoring in Children

Author(s):

Bo-Hao Tang, Min Kan, Xin-Mei Yang, Rong-Hua Wang, Hai-Yan Shi, Yi Zheng, Guo-Xiang Hao, Lin-Lin Song and Wei Zhao*   Pages 1 - 8 ( 8 )

Abstract:


Background: Mezlocillin is off-label used for the treatment of respiratory infections in children. Therapeutic drug monitoring (TDM) data are also limited in children. A sensitive Liquid chromatography tandem mass spectrometry (LC–MS/MS) method adapted to children was developed and validated for the determination of mezlocillin plasma concentration in present study.

Method: Mezlocillin, extracted from a volume of 50 μL plasma using acetonitrile, was analyzed on an online LC–MS/MS system with an Agilent 1290 Infinity UHPLC (Agilent Technologies, CA, USA) coupled to an AB SCIEX QTRAP 6500PLUS MS/MS (AB Sciex, Framingham, MA, USA) with ceftiofur as an internal standard. HPLC separation was performed on a C18 column with ultrapure water and acetonitrile as gradient elution at a flow rate of 0.4 mL/min at 30o C. Analyst TM Version 1.5.2 (Applied Biosystems) was used for data acquisition. The total chromatographic run time was 1.6 min.

Results: LC/MS/MS method used for TDM of mezlocillin in children was developed and validated. This assay has a lower limit of quantification of 0.025 μg/mL for mezlocillin with 50 μL plasma. Good linearity was achieved for mezlocillin over the range 0.025 to 20 μg /mL. The acceptance criteria were met in all cases. Among 36 patients aged 0.16-1.63 years old, only one patient had detectable trough concentration higher than 1 μg/mL.

Conclusion: LC-MS/MS method with 50 μL plasma developed in our study was successfully applied to TDM of mezlocillin in children. The high variability of trough concentration highlighted TDM is important to optimize mezlocillin therapy in children.

Keywords:

Mezlocillin, LC-MS/MS, children, therapeutic drug monitoring, plasma, quantification

Affiliation:

Department of Clinical Pharmacy, School of Pharmaceutical Sciences, Shandong University, Jinan, Department of Clinical Pharmacy, School of Pharmaceutical Sciences, Shandong University, Jinan, Department of Pharmacy, The First Affiliated Hospital of Shandong First Medical University, Jinan, Department of Pharmacy, The Affiliated Weihai Second Municipal Hospital of Qingdao University, Weihai, Department of Pharmacy, The First Affiliated Hospital of Shandong First Medical University, Jinan, Department of Clinical Pharmacy, School of Pharmaceutical Sciences, Shandong University, Jinan, Department of Clinical Pharmacy, School of Pharmaceutical Sciences, Shandong University, Jinan, Department of Pharmacy, The First Affiliated Hospital of Shandong First Medical University, Jinan, Department of Clinical Pharmacy, School of Pharmaceutical Sciences, Shandong University, Jinan



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