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Summary

This study presents a novel liquid chromatography-mass spectrometry method for detecting 125 drugs in urine. The approach utilizes information-dependent acquisition and enhanced product ion spectra for accurate identification.

Keywords:
Broad-spectrum drug screeningHybrid triple-quadrupole linear ion trapLiquid chromatography-tandem mass spectrometry (LC-MSMS)Positive-mode electrosprayUrine solid-phase extraction

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Area of Science:

  • Analytical Chemistry
  • Forensic Toxicology
  • Pharmacology

Background:

  • Accurate drug detection in biological samples is crucial for clinical and forensic applications.
  • Existing methods may lack the sensitivity or specificity required for comprehensive drug screening.
  • Solid-phase extraction (SPE) and liquid chromatography-mass spectrometry (LC-MS) are established techniques for drug analysis.

Purpose of the Study:

  • To develop and validate a sensitive and specific LC-MS/MS method for the simultaneous detection of 125 drugs in urine.
  • To implement an information-dependent acquisition (IDA) strategy coupled with enhanced product ion (EPI) scanning for robust drug identification.
  • To establish a workflow for routine toxicological screening of a wide range of pharmaceutical compounds.

Main Methods:

  • Urine samples were processed using C18 solid-phase extraction (SPE).
  • Liquid chromatography (LC) with gradient elution on a reverse-phase column was employed.
  • A hybrid triple-quadrupole linear ion trap (QqQ/QqLIT) mass spectrometer was used with positive electrospray ionization (ESI).
  • An acquisition method combining selected ion monitoring (SRM) survey scans with information-dependent acquisition (IDA) of enhanced product ion (EPI) spectra was utilized.
  • EPI spectra were automatically searched against a library of 125 reference drug spectra for identification.

Main Results:

  • The method enabled the analysis of 125 drugs in a single run.
  • Information-dependent acquisition successfully triggered EPI scans for precursor ions identified in the SRM survey.
  • EPI spectra provided rich fragmentation data for confident drug identification by library matching.
  • The combined SRM-IDA-EPI approach demonstrated high specificity and sensitivity for drug detection in urine.

Conclusions:

  • The developed LC-MS/MS method with SRM-IDA-EPI acquisition is a powerful tool for comprehensive urine drug screening.
  • This approach enhances the efficiency and reliability of toxicological analysis.
  • The method facilitates accurate identification of a broad spectrum of drugs, aiding in clinical diagnostics and forensic investigations.