Iterative SLIM (itSLIM) for Ultrahigh Resolution Targeted Ion Mobility Analysis
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View abstract on PubMed
Summary
This summary is machine-generated.We developed iterative SLIM (itSLIM) to boost ultrahigh-resolution ion mobility (UHRIM) separations. This method enhances ion mobility resolution by increasing path length without changing device size, improving analytical accuracy.
Area Of Science
- Analytical Chemistry
- Separation Science
- Mass Spectrometry
Background
- Ion mobility separations offer valuable structural information but often lack sufficient resolution for complex samples.
- Achieving ultrahigh resolution in ion mobility requires impractically long separation paths, limiting practical applications.
Purpose Of The Study
- To introduce and validate an iterative approach for enhancing ion mobility resolution using Structures for Lossless Ion Manipulation (SLIM).
- To demonstrate the capability of this method for resolving isomeric compounds and enabling liquid chromatography-free small molecule identification.
Main Methods
- Implementation of a bidirectional, rounded-turn ion path design within a SLIM device for iterative ion manipulation.
- Repetitive cycling of mobility-separated ions through the SLIM path to effectively increase separation length without increasing device footprint.
- Integration of iterative SLIM (itSLIM) with MS/MS fragmentation for targeted analysis and identification.
Main Results
- Achieved ultrahigh-resolution ion mobility (UHRIM) separation with a two-peak resolution of 2.48 for challenging phosphatidylethanolamine lipid isomers.
- Demonstrated a liquid chromatography-free workflow for definitive identification of isomeric drugs (norcodeine and norhydrocodone) using a 90-m itSLIM path coupled with MS/MS.
- itSLIM process showed minimal ion loss across multiple iterations, preserving separation order and enabling enhanced resolution.
Conclusions
- Iterative SLIM (itSLIM) significantly enhances ion mobility resolution by increasing effective path length, offering a powerful strategy for high-performance analytical separations.
- This technique provides a pathway to simplified mass spectrometry/mass spectrometry spectra and improved identification accuracy, particularly beneficial for targeted analysis.
- The itSLIM approach holds potential for increasing throughput in screening workflows by reducing or eliminating liquid chromatography run times.
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