Rapid screening method covers common 161 forensic drugs by ultra-high speed LC/MS/MS with synchronized survey scanning

Significance of the Topic

Liquid chromatography–tandem mass spectrometry (LC/MS/MS) is a cornerstone in forensic toxicology, enabling rapid, simultaneous detection of multiple drugs in complex biological matrices. Developing a high-throughput screening method for a broad range of analytes addresses the growing need for efficient drug analysis in legal and clinical investigations.

Objectives and Study Overview

This work presents a rapid screening protocol targeting 161 common forensic drugs in Japan. The aim was to achieve both reliable quantitation and structural confirmation within a single ultra-high-speed LC/MS/MS run by employing synchronized survey scanning.

Methodology and Instrumentation

• Sample Preparation: Modified QuEChERS extraction from human whole blood spiked with internal standards diazepam-d5 and phenobarbital-d5. Extracts were cleaned by salt partitioning, dried, and reconstituted in methanol with 0.1% TFA.
• Chromatography: Separation on Phenomenex Kinetex XB-C18 (2.1×100 mm, 2.6 µm) at 40 °C using a 0.3 mL/min binary gradient of 10 mM ammonium formate/0.1% formic acid in water (A) and methanol (B) over 15 min.
• Mass Spectrometry: Shimadzu LCMS-8040 triple quadrupole with electrospray ionization in polarity switching mode. Data acquired using synchronized survey scanning, combining scheduled MRM for quantitation with triggered product-ion scans for confirmation.

Key Results and Discussion

• Calibration and Linearity: Four concentration groups (0.001–1, 0.01–10, 0.1–100, 10–10,000 ng/µL) exhibited linearity (R² > 0.995) for all 161 analytes.
• Precision and Recovery: Most compounds showed CV < 10% at low levels; average overall recovery was 68.3%.
• Matrix Effects: Comparison across blood, muscle, liver, and heart for 24 representative drugs demonstrated minor matrix influences, confirming method robustness.
• Qualitative Confirmation: Product-ion spectra matched library entries with high scores, providing reliable compound identification alongside quantitation.

Benefits and Practical Application

The single-run approach reduces analysis time and resource consumption, while delivering both quantitative data and structural confirmation. It enhances throughput in forensic laboratories and supports rapid decision-making in toxicological casework.

Future Trends and Potential Applications

The methodology can be extended to emerging psychoactive substances and additional biological matrices. Integration with high-resolution mass spectrometry and advanced data processing workflows will further streamline forensic analyses and improve detection limits.

Conclusion

An ultra-fast LC/MS/MS method with synchronized survey scanning was successfully developed for the simultaneous screening of 161 forensic drugs. It provides high sensitivity, reproducibility, and confirmation capability in a single 15-minute run, greatly enhancing the efficiency of forensic toxicology workflows.

Used Instrumentation

• Nexera UHPLC system (Shimadzu Corporation)
• LCMS-8040 triple quadrupole mass spectrometer with ESI (Shimadzu Corporation)

References

No external literature references were provided in the source document.