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Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
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Chemical Ionization (CI) Mass Spectrometry01:21

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The molecular ion peak of a molecule in the mass spectrum provides vital information for molecular identification. However, conventional electron impact ionization can lead to the rapid dissociation of some molecular ions before they reach the detector. A milder ionization method is required to increase the lifetime of such ionized analyte molecules. Chemical ionization (CI) is a gas-phase protonation reaction useful for mass-analyzing analyte molecules that are easily protonated to yield the...
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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
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Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
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Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments
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Improved Ion Mobility Separation and Structural Characterization of Steroids using Derivatization Methods.

Diana C Velosa1, Andrew J Dunham1, Marcus E Rivera1

  • 1Chemistry Program, Department of Biomedical and Chemical Engineering and Sciences, Florida Institute of Technology, Melbourne, Florida 32904, United States.

Journal of the American Society for Mass Spectrometry
|August 1, 2022
PubMed
Summary

This study enhances steroid analysis by combining liquid chromatography-ion mobility-tandem mass spectrometry (LC-IM-MS/MS) with chemical derivatization. This approach improves the identification of known steroids and the discovery of unknown steroid metabolites in complex samples.

Keywords:
DerivatizationIon Mobility-Mass SpectrometryShift ReagentsSteroids

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Metabolomics

Background:

  • Steroids are crucial biomolecules involved in metabolism, development, nutrition, and disease.
  • Existing GC- and LC-MS/MS methods excel at targeted steroid quantitation but struggle with identifying unknowns in complex biological matrices.
  • Ion mobility (IM) coupled with MS/MS offers enhanced analytical capabilities for steroid analysis.

Purpose of the Study:

  • To improve the resolution and structural elucidation of steroid metabolites using liquid chromatography-ion mobility-tandem mass spectrometry (LC-IM-MS/MS).
  • To develop a method combining LC-IM-MS/MS with selective chemical derivatization for enhanced steroid analysis.
  • To facilitate the identification of both known and unknown steroid compounds in complex biological samples.

Main Methods:

  • Coupling liquid chromatography-ion mobility-tandem mass spectrometry (LC-IM-MS/MS) with chemical derivatization reactions targeting hydroxyl and carbonyl functional groups.
  • Utilizing 1,1-carbonyldiimidazole for derivatizing hydroxyl groups, enhancing ion mobility resolution for stereoisomer pairs.
  • Employing Girard's Reagent P for carbonyl group derivatization, creating unique products based on functional group differences and C17 alkylation.

Main Results:

  • Derivatization with 1,1-carbonyldiimidazole increased ion mobility resolution (ΔCCS > 15%) for steroid stereoisomer pairs like testosterone/epitestosterone.
  • Parallel derivatization with Girard's Reagent P generated distinct products, aiding in distinguishing steroids based on functional groups and C17 alkylation.
  • The combined data from retention time, collision cross section, accurate mass, and MS/MS fragmentation enabled facile deciphering of steroid structures.
  • Girard's Reagent P derivatization enhanced ionization efficiency, suggesting potential improvements in sensitivity.

Conclusions:

  • The integration of simple derivatization reactions with LC-IM-MS/MS offers a powerful approach for analyzing known steroid analytes.
  • This method provides critical structural information essential for the identification of previously unknown steroid metabolites.
  • The developed technique enhances both targeted steroid quantitation and the discovery of novel steroid compounds in complex biological systems.