A Simple LC-MS/MS Method for Simultaneous Analysis of 35 Anti-psychotics in Human Plasma for Clinical Research

Importance of the Topic

Antipsychotic medications play a critical role in the management of psychiatric disorders, yet their complex pharmacokinetics and potential drug–drug interactions demand precise quantification methods.
Reliable measurement of multiple antipsychotics in biological matrices supports clinical research into efficacy, safety, and individual dosing strategies.

Objectives and Study Overview

This study aimed to develop and verify a robust, high-throughput LC-MS/MS method for simultaneous quantification of 35 antipsychotics in human plasma.
The goal was to achieve rapid analysis with simple sample preparation, suitable sensitivity, accuracy, and precision for clinical research applications.

Methodology

Sample preparation relied on protein precipitation:

• 50 µL plasma mixed with 100 µL of methanol/ZnSO₄ (70:30 v/v).
• Centrifugation at 18 000 g for 5 minutes, transfer of supernatant, and dilution with water.
• Automated mixing before injection.

Chromatographic separation employed a short C18 column (2.1×30 mm, 2.5 µm) at 45 °C with a 5‐minute gradient using ammonium acetate/formic acid buffers.
MS detection used electrospray positive ionization in multiple reaction monitoring mode.

Used Instrumentation

• Waters ACQUITY UPLC I-Class System with FL Sample Manager.
• Waters Xevo TQ-S micro Triple Quadrupole Mass Spectrometer.
• MassLynx™ and TargetLynx™ software for data acquisition and processing.

Results and Discussion

Verification parameters demonstrated:

• Functional sensitivity: precise quantification at defined LLMI with ≤20% CV and ≤15% bias.
• Linearity: r² > 0.99 over broad ranges tailored to each compound.
• Precision: total precision ≤8.7% CV and repeatability ≤7.4% CV across QC levels.
• Matrix effects: normalized matrix factors between 0.88 and 1.14, indicating effective IS compensation.
• Extraction recovery: mean efficiencies between 52% and 97%, overall recoveries within 85–115%.
• Autosampler stability: QC levels remained within ±15% over 72 hours at 5 °C.

Benefits and Practical Applications

• Simultaneous analysis of 35 antipsychotics in a single 5-minute LC-MS/MS run.
• Minimal sample volume (50 µL) and cost-effective, straightforward preparation.
• High throughput suitable for clinical pharmacokinetic and drug interaction studies.

Future Trends and Potential Applications

Advances may include:

• Expansion to even larger drug panels and metabolites for comprehensive profiling.
• Integration with automated sample handling to increase laboratory throughput.
• Application in personalized medicine to tailor antipsychotic dosing based on real-time drug level monitoring.

Conclusion

The presented LC-MS/MS method offers a fast, reliable, and sensitive approach for simultaneous quantification of 35 antipsychotic drugs in human plasma.
Its simplicity, precision, and speed make it ideal for clinical research into drug efficacy, safety, and pharmacokinetic interactions.

References

• Wijesinghe R: A review of pharmacokinetic and pharmacodynamic interactions with antipsychotics. Ment Health Clin 2016, 6(1):21–27.