Highly-Efficient Screening Approach for Toxicological Compounds in Human Blood Samples on LCMS-9030

Significance of the Topic

Efficient multispectral screening of drugs and toxic compounds in biological matrices underpins forensic and clinical toxicology. High-resolution mass spectrometry coupled with ultra-high-performance liquid chromatography enables precise mass measurements and rich MS/MS data, facilitating identification of a broad spectrum of illicit drugs, pharmaceuticals, and other toxicants in complex blood samples.

Aims and Overview of the Study

This work evaluates targeted and untargeted toxicological screening workflows on the Shimadzu LCMS-9030 Q-TOF system. Using both data-dependent (DDA) and data-independent (DIA) acquisition modes, the study applies LabSolutions Insight Explore (Analyze and Assign modules) to identify 61 spiked drug standards in human whole blood.

Methodology and Instrumentation

• Sample Preparation: QuEChERS cleanup of human whole blood spiked with 61 drug compounds.
• Chromatography: Kinetex XB-C18 column (2.1×100 mm, 2.6 µm) at 40 °C, flow 0.3 mL/min; mobile phase A: 10 mM ammonium formate/0.1 % formic acid in water; B: same in methanol; gradient 5 %–100 % B over 12.5–19 min.
• Mass Spectrometry: Shimadzu LCMS-9030 Q-TOF with heated ESI; interface 300 °C; DL 250 °C; heat block 400 °C; N2 nebulizing (3 L/min) and drying (10 L/min) gases; data acquisition in DDA (m/z 50–550, CE 35 V, loop time 0.2 s) and DIA modes (m/z 50–550, CE 35 V, loop time 0.55 s).
• Data Analysis: LabSolutions Insight Explore v3.8 SP4 Analyze for component detection, deconvolution, precursor extraction, MS/MS library search; Assign for molecular formula prediction and structural annotation via ChemSpider/PubChem.

Main Results and Discussion

• DDA Workflow: 1043 components detected; Screen search (MS+RT) recovered 56 targeted compounds; HRMS library search of MS/MS spectra confirmed identities.
• DIA Workflow: Deconvolution yielded precursor lists and MS/MS spectra; combined Screen and library searches enabled robust compound confirmation; extracted ion chromatograms aided verification.
• Untargeted Screening: Deconvoluted DIA precursors (197 total) underwent formula prediction (up to 180 candidates) and Assign database searches; example identifications include phthalaldehyde and phytosphingosine; highlights need for manual review and orthogonal confirmation.

Benefits and Practical Applications

• Streamlined targeted and untargeted screening in a single analytical platform.
• High throughput data processing with automated deconvolution and library search.
• Enhanced confidence in compound identification for forensic toxicology and clinical analysis.

Future Trends and Opportunities

• Expansion of HRMS spectral libraries and integration of AI-driven identification algorithms.
• Extension to quantitative validation and regulatory compliance.
• Adoption of hybrid acquisition strategies and orthogonal techniques (e.g., NMR, GC-MS) for comprehensive profiling.
• Real-time data processing and reporting for rapid toxicological screening.

Conclusion

The Shimadzu LCMS-9030 Q-TOF combined with LabSolutions Insight Explore offers efficient, reliable targeted and untargeted workflows for toxicological screening in human blood. While DDA and DIA approaches deliver comprehensive detection and identification, further method validation and quantitation are required for routine application.

References

1. S. Dulaurent, S. El Balkhi, L. Poncelet, J.-M. Gaulier, P. Marquet, F. Saint-Marcoux. Anal. Bioanal. Chem. 408:1467–1474 (2016).
2. N. Tansrisawad, U. Hoonwijit, A. Tubtimrattana, B. Intawong, S. Tanasarnsopaporn, J. Boonsritan, Z. Sun, C. Comsup, P. Tienprateep, Z. Zhan. ASMS poster MP-572 (2020).
3. Shimadzu. High-Resolution Accurate Mass Library for Forensic Toxicology (2022).