High-Speed Quantitative Analysis of Antiepileptic Drugs Using Triple Quadrupole LC/MS/MS

Importance of Topic

The rapid and accurate quantification of anti-epileptic drugs (AEDs) in biological matrices is critical for therapeutic drug monitoring, pharmacokinetic studies, and clinical diagnostics. High-throughput methods that minimize sample preparation and analysis time can significantly improve laboratory efficiency and patient care by delivering timely and reliable data.

Objectives and Study Overview

This study demonstrates a high-speed quantitative workflow for 16 common AEDs using the Shimadzu UFMS Triple Quadrupole LCMS-8050 system. The aim was to achieve comprehensive quantification in human plasma with minimal sample preparation and a total run time of 7 minutes per injection.

Methodology

Sample preparation involved simple protein precipitation of plasma followed by 100-fold dilution in methanol, eliminating the need for lengthy clean-up steps. A 1 μL injection was used for all analyses. The gradient separation employed an Inertsil ODS-4 column (50 mm × 2.1 mm, 2 μm) with mobile phases of 10 mM ammonium acetate (A) and methanol (B). A rapid gradient from 3 % to 90 % B over 5 minutes ensured sharp chromatographic peaks and baseline separation of all analytes.

Instrumentation

• Liquid Chromatograph: Shimadzu UFLC with Inertsil ODS-4 column
• Mass Spectrometer: Shimadzu LCMS-8050 triple quadrupole
• Ionization Mode: ESI positive and negative switching (+4.5 kV/–3.5 kV)
• Temperatures: DL 150 °C, Block Heater 200 °C, Interface 400 °C
• Gas Flows: Nebulizing 3 L/min, Drying 10 L/min, Heating 10 L/min

Main Results and Discussion

All 16 AEDs showed excellent linearity across their calibration ranges (r² ≥ 0.995). Quality control samples at low, medium, and high levels demonstrated accuracy within 86 % to 135 % for all analytes, confirming method robustness despite the minimal sample handling and small injection volume. Representative MRM chromatograms confirmed clear resolution of target compounds within a 7-minute window.

Benefits and Practical Applications

The streamlined sample preparation and fast chromatographic cycle offer significant time savings for clinical and research laboratories. The method supports routine therapeutic drug monitoring of AEDs, enabling high sample throughput without compromising data quality. Automated data processing via LabSolutions Quant Browser further accelerates review and reporting.

Future Trends and Applications

Emerging trends include integration of ultra-high-throughput platforms with automated sample handling and advanced data analytics. Further expansion to cover additional drug classes or metabolites and coupling with high-resolution mass spectrometry could improve specificity and broaden clinical utility.

Conclusion

This work highlights an efficient LC-MS/MS approach for rapid quantitation of multiple AEDs in plasma. The combination of minimal sample pretreatment, short run times, and reliable quantitative performance makes it a valuable tool for clinical laboratories and pharmacokinetic research.