Analysis of isomeric opioids in urine using LC-TIMS-TOF MS

Talanta. 2018 Jun 1;183:177-183. doi: 10.1016/j.talanta.2018.02.077. Epub 2018 Feb 19.

Abstract

In the present work, a fast separation, identification and quantification workflow based on liquid chromatography coupled to trapped ion mobility in tandem with mass spectrometry (LC-TIMS-MS) is described for the analysis of common isomeric drugs of abuse and their metabolites in human urine. In particular, the analytical performance of LC-TIMS-MS is shown for identification based on retention time, collision cross section and accurate mass for three sets of common isomeric opioids and their deuterated analogs in urine. The LC-TIMS-MS analysis provided limits of detection of 1.4-35.2 ng/mL with demonstrated linearity up to 500 ng/mL, enabling discovery and targeted monitoring (DTM) of opioids in urine, with high precision in retention times (RT) (< 0.3%), collision cross sections (CCS) (< 0.6%) and mass accuracy (< 1 ppm) across multiple measurements using external calibration. A good agreement was observed between theoretical and experimental CCS from candidate structures optimized at the DFT/B3LYP level. The need for complementary liquid and mobility separations prior to mass analysis is shown for the analysis of complex mixtures, with mobility resolving power of 80-130. The reproducibility and high speed of LC-TIMS-MS analysis provides a powerful platform for drug and metabolite screening in biological matrices with higher precision and confidence than traditional LC-multiple reaction monitoring (MRM) approaches.

Keywords: Drugs of abuse; Isomeric separation; Liquid chromatography; Mass spectrometry; Opioids; Trapped ion mobility spectrometry.

MeSH terms

  • Analgesics, Opioid / urine*
  • Calibration
  • Chromatography, Liquid
  • Humans
  • Isomerism
  • Quantum Theory
  • Tandem Mass Spectrometry

Substances

  • Analgesics, Opioid