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In mass spectroscopy, amines undergo fragmentation to give parent ions with odd molecule weights. This observed mass spectrum follows the nitrogen rule: a molecule with an odd number of nitrogen atoms produces a parent ion with an odd molecular weight. The remaining fragments have an even mass.
Amines undergo fragmentation through α cleavage, producing nitrogen-containing cations—iminium ions—and alkyl radicals. Mass spectra of aromatic and cyclic aliphatic amines exhibit...
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Polyamine quantitation by LC-MS using isobutyl chloroformate derivatives.

Christine Isaguirre1, Megan Gendjar1, Kelsie M Nauta2

  • 1Mass Spectrometry Core, Van Andel Institute, Grand Rapids, MI, United States.

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|May 17, 2025
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Summary

This study introduces a simple isobutyl-chloroformate derivatization method for quantifying polyamines using liquid chromatography-mass spectrometry. The protocol enhances metabolomics by enabling accurate measurement of thirteen polyamines, even co-eluting isomers.

Keywords:
AcetylspermidineMetabolismMetabolomicsReversed phase

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Metabolomics

Background:

  • Polyamines are crucial metabolites often inadequately quantified in standard metabolomics workflows.
  • Existing methods lack comprehensive coverage or require specialized techniques for polyamine analysis.

Purpose of the Study:

  • To develop and validate a straightforward protocol for the quantitative analysis of polyamines.
  • To enable polyamine measurement as a standalone or supplementary step in existing metabolomics pipelines.

Main Methods:

  • Isobutyl-chloroformate derivatization of metabolite extracts.
  • Quantitative analysis using a 15-minute Liquid Chromatography-Mass Spectrometry (LC-MS) method.
  • Utilized triple quadrupole mass spectrometry with at least two transitions per compound.

Main Results:

  • Successfully quantified thirteen polyamines and two internal standards.
  • Achieved individual quantification of co-eluting isomers N1- and N8-acetylspermidine.
  • Defined the linear dynamic range for each quantified compound across various biological sample types.

Conclusions:

  • The developed isobutyl-chloroformate derivatization method offers a simple, robust, and rapid approach for polyamine quantification.
  • This protocol significantly improves polyamine coverage in metabolomics, applicable both independently and post-initial analysis.
  • The method facilitates detailed polyamine profiling, including isomer-specific analysis, in diverse biological matrices.