Comprehensive and Sensitive UHPLC-MS/MS Analysis for Urinary Porphyrins

Importance of the Topic

Porphyrins are key biomolecules in the heme synthesis pathway, with altered urinary excretion profiles serving as indicators of metabolic disorders such as porphyria. Sensitive and accurate quantification of urinary porphyrins enables early diagnosis and monitoring of liver and genetic diseases, as well as research into heme-related biochemical processes.

Objectives and Study Overview

This work describes the development and validation of a comprehensive UHPLC-MS/MS method for simultaneous analysis of eight porphyrins and related metabolites in human urine. The goal was to establish a streamlined workflow requiring minimal sample preparation while delivering high sensitivity, specificity, and reproducibility across clinically relevant concentration ranges.

Methodology

A simple one-step extraction was employed using acidified urine samples, followed by reversed-phase chromatography and tandem mass spectrometry detection.

• Sample preparation: 75 µL urine mixed with 30 µL 6 M formic acid, vortexed, centrifuged, and supernatant injected.
• Chromatographic separation: Shim-pack GIST C18 column (75 × 4.6 mm, 3 µm); gradient elution using mobile phase A (0.1% formic acid in acetonitrile:water 90:10) and B (0.1% formic acid in water) at 0.5 mL/min, column at 40 °C.
• Mass spectrometry: Shimadzu LCMS-8045 with positive-mode electrospray ionization; optimized multiple reaction monitoring (MRM) transitions and collision energies for eight analytes.

Instrumentation Used

• Shimadzu Nexera X3 UHPLC system
• Shim-pack GIST C18 analytical column
• Shimadzu LCMS-8045 triple quadrupole mass spectrometer
• Electrospray ionization source operating in positive polarity

Main Results and Discussion

The method demonstrated excellent chromatographic resolution of all eight porphyrins, with linear calibration curves (R² > 0.99) across low to high µg/L concentration levels. Quality control samples showed recoveries within predefined ranges for Level-1 and Level-2 concentrations, indicating accuracy and precision. The approach offered limits of quantitation suitable for clinical diagnostics and research, with minimal matrix interference and good repeatability over multiple analytical batches.

Benefits and Practical Applications

• High throughput: 20 min total run time allows analysis of large sample sets.
• Sensitivity and specificity: Optimized MRM transitions ensure selective detection of individual porphyrins.
• Minimal sample preparation: One-step extraction reduces labor and potential errors.
• Clinical and research use: Applicable to routine screening of porphyrias, monitoring therapeutic interventions, and investigating heme metabolism.

Future Trends and Applications

Advances in high-resolution and high-throughput MS technologies will further enhance sensitivity and reduce analysis time for porphyrin profiling. Integration with automated sample preparation platforms and coupling with bioinformatics tools for pattern recognition may enable comprehensive metabolomic studies and personalized diagnostics. Development of point-of-care or miniaturized MS systems could expand use in decentralized healthcare settings.

Conclusion

A robust UHPLC-MS/MS assay has been established for sensitive, accurate, and reproducible quantification of urinary porphyrins. The method’s streamlined workflow and strong performance characteristics make it well suited for clinical laboratories, research institutions, and quality control environments focused on heme-related disorders.

References

1. Quantification of six Porphyrin biomarkers in urine using LC-2050C with fluorescence detection (2023) 06-SAIP-LC-054-EN.
2. Simultaneous determination of six urinary porphyrins using liquid chromatography–tandem mass spectrometry. Journal of Chromatography B 783.2 (2003): 411–423.