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Step-by-Step Approach to Build Multiple Reaction Monitoring (MRM) Profiling Instrument Acquisition Methods for

Leriana G Reis1, Theresa M Casey2, Tiago J P Sobreira3

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Multiple reaction monitoring (MRM) profiling enables lipid and small molecule analysis without chromatography. This study details updating MRM methods using the Lipid Maps database for exploratory lipid analysis.

Keywords:
MRM profilingdirect injection analysisexploratory analysislipids

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Area of Science:

  • Analytical Chemistry
  • Lipidomics
  • Mass Spectrometry

Background:

  • Multiple reaction monitoring (MRM) profiling is a technique for analyzing lipids and small molecules directly from samples.
  • This method relies on specific ion transitions (MRMs) derived from lipid databases.
  • The expanding nature of lipid databases necessitates continuous updates to MRM profiling methods.

Purpose of the Study:

  • To provide a comprehensive overview of MRM profiling methodology and workflow.
  • To present a step-by-step guide for constructing MRM profiling instrument acquisition methods.
  • To facilitate class-based lipid exploratory analysis using the Lipid Maps database.

Main Methods:

  • Importing lipid data from the Lipid Maps database.
  • Combining isomeric lipids to determine species-level neutral mass.
  • Predicting ionized precursor ions and expected product ions for MRM transitions.
  • Simulating precursor ions for suspect screening of modified lipids (e.g., oxidized lipids).

Main Results:

  • A detailed workflow for building MRM profiling methods is described.
  • The process includes data import, lipid consolidation, nomenclature attribution, and ion prediction.
  • Example output formats for Agilent MassHunter are provided, including optimization parameters.

Conclusions:

  • The presented workflow enables the creation of updated MRM profiling methods for lipidomics.
  • This approach supports exploratory lipid analysis by leveraging the Lipid Maps database.
  • The methodology facilitates the optimization of instrument parameters for lipid class-based analysis.