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Updated: Aug 11, 2025

Large Scale Non-targeted Metabolomic Profiling of Serum by Ultra Performance Liquid Chromatography-Mass Spectrometry UPLC-MS
Published on: March 14, 2013
Targeted Small-Molecule Identification Using Heartcutting Liquid Chromatography-Infrared Ion Spectroscopy
Rianne E van Outersterp1, Jitse Oosterhout1, Christoph R Gebhardt2
1Radboud University, Institute for Molecules and Materials, FELIX Laboratory, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands.
We developed a heartcutting liquid chromatography-infrared ion spectroscopy (LC-IRIS) method to overcome timescale differences. This automated setup successfully records multiple IR spectra for separated compounds, aiding molecular identification in complex samples.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Chromatography
Background:
- Infrared ion spectroscopy (IRIS) identifies molecular structures from mass spectrometry (MS) but faces challenges when coupled with liquid chromatography (LC) due to timescale mismatches.
- Direct online coupling of LC and IRIS is difficult because IRIS experiments take minutes, while LC fractions elute in seconds.
Purpose of the Study:
- To develop an automated heartcutting LC-IRIS approach to resolve the timescale discrepancy between LC separation and IRIS analysis.
- To enable multiple IR spectrum acquisitions for separated LC-features from a single injection without compromising separation performance.
Main Methods:
- A heartcutting LC-IRIS setup utilizing two switching valves and two sample loops was designed as an alternative to direct online coupling.
- The automated setup was tested for drug metabolism research and analysis of closely eluting diastereomeric biomarkers.
Main Results:
- The heartcutting LC-IRIS setup successfully recorded multiple m/z-selective IR spectra for two drug metabolites from a single cell incubation extract injection.
- The system demonstrated good sensitivity, analyzing μL injections of μM samples, and maintained chromatographic separation for closely eluting diastereomers of PDE-ALDH7A1 biomarkers.
- Multiple IR spectra were acquired for two LC-features from a single injection without degrading LC-separation performance.
Conclusions:
- The automated heartcutting LC-IRIS approach effectively bridges the timescale gap between LC and IRIS.
- This method facilitates detailed molecular structure identification of compounds separated by LC, with broad applications in analytical fields requiring LC-MS analysis.
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