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Peptide separation in normal phase liquid chromatography

T Yoshida1

  • 1Scientific Instrument Division, Tosoh Corporation, Tokyo Research Center, Kanagawa-ken, Japan.

Analytical Chemistry
|August 1, 1997
PubMed
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A novel normal phase liquid chromatography method effectively separates peptides using TSK gel Amide-80. This technique enhances peptide separation, especially for hydrophilic peptides, complementing reversed-phase methods.

Area of Science:

  • Analytical Chemistry
  • Chromatography

Background:

  • Peptide separation is crucial in proteomics and drug discovery.
  • Existing methods like reversed-phase liquid chromatography have limitations in separating certain peptide types, particularly hydrophilic ones.

Purpose of the Study:

  • To establish a new normal-phase liquid chromatography (NPLC) method for peptide separation.
  • To evaluate the effectiveness of TSK gel Amide-80 for NPLC peptide separation.
  • To demonstrate the complementary nature of NPLC with reversed-phase liquid chromatography (RPLC) for comprehensive peptide analysis.

Main Methods:

  • Utilized TSK gel Amide-80, a silica gel matrix with carbamoyl groups, for normal phase chromatography.
  • Employed an acetonitrile-water solution with 0.1% trifluoroacetic acid as the mobile phase.

Related Experiment Videos

  • Investigated the effect of acetonitrile concentration on peptide retention time.
  • Performed two-dimensional (2D) separation combining NPLC and RPLC for protein digests.

    • Main Results:

    • Peptide retention time increased with higher acetonitrile concentrations in the mobile phase.
    • Successfully retained and separated hydrophilic peptides that showed no retention on RPLC columns.
    • Demonstrated significantly different separation selectivities between NPLC and RPLC methods.
    • Achieved complete separation of all peptides from a protein digest using 2D chromatography.
    • Observed peptide recovery exceeding 80% with satisfactory repeatability and reproducibility.

    Conclusions:

    • The developed NPLC method using TSK gel Amide-80 is effective for peptide separation, particularly for hydrophilic peptides.
    • This NPLC method offers distinct separation selectivities compared to RPLC, making it a valuable orthogonal technique.
    • Two-dimensional chromatography combining NPLC and RPLC provides comprehensive peptide separation, ideal for complex biological samples.