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Related Experiment Videos

Controlling deuterium isotope effects in comparative proteomics.

Roujian Zhang1, Cathy S Sioma, Robert A Thompson

  • 1Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, USA.

Analytical Chemistry
|August 15, 2002
PubMed
Summary

Structural features of heavy isotope coded peptides significantly impact their resolution in reversed-phase chromatography (RPC). Deuterium placement near hydrophilic groups and smaller peptide/coding agent sizes enhance chromatographic separation.

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Area of Science:

  • Analytical Chemistry
  • Chromatography
  • Mass Spectrometry

Background:

  • Peptide identification and quantification often rely on chromatographic separation.
  • Heavy isotope labeling is crucial for quantitative proteomics.
  • Understanding factors affecting chromatographic resolution is key for accurate analysis.

Purpose of the Study:

  • To identify structural features of heavy isotope coding agents that influence peptide resolution in reversed-phase chromatography (RPC).
  • To elucidate the impact of deuterium atom placement, number, and coding agent structure on the chromatographic isotope effect.

Main Methods:

  • Synthesis and application of six deuterated coding agents with varied structures and deuterium placements.
  • Analysis of heavy isotope coded peptides using reversed-phase chromatography.

Related Experiment Videos

  • Evaluation of the chromatographic isotope effect by normalizing resolution based on deuterium atom count.

    • Main Results:

    • Significant variation in both absolute and relative contributions to the chromatographic isotope effect among different labeling agents.
    • Deuterium atom placement relative to hydrophilic groups was the most dominant factor influencing resolution.
    • Smaller peptide and coding agent sizes correlated inversely with the magnitude of the isotope effect.

    Conclusions:

    • Placing deuterium atoms adjacent to hydrophilic groups in coding agents diminishes their interaction with the RPC stationary phase, improving resolution.
    • Solvophobic theory explains the reduced interaction of deuterium atoms near hydrophilic groups.
    • Peptide and coding agent size influence the isotope effect due to the relative size of the conjugate compared to the coding agent alone.