Differences Between Peptide and Glycopeptide Workflows in SCIEX OS

For research use only. Not for use in diagnostic procedures.

Answer

The key differences are as follows:

• Mass range (TOF MS): The Glycopeptide workflow extends the upper mass range from 1500 Da to 3000 Da, allowing detection of higher-mass precursors typically associated with glycopeptides.

• Mass range (TOF MS/MS): Similarly, the MS/MS range is extended in the Glycopeptide workflow (150–3000 Da) compared to the Peptide workflow (100–1500 Da). This accommodates larger fragment ions and glycan-related species.

• Q1 resolution: The Glycopeptide workflow uses Low resolution, while the Peptide workflow uses Unit resolution. Lower resolution increases ion transmission and sensitivity, which is beneficial for glycopeptides that are often lower in abundance and may require improved fragmentation efficiency across a broader range of species.

• MS/MS low mass cutoff: The Glycopeptide workflow starts at 150 Da instead of 100 Da. This mass range is optimized for glycopeptide fragments and helps improve efficiency during Zeno trapping.

• Time bins to sum (MS/MS): The Glycopeptide workflow uses a slightly higher value (10 vs 8), which improves signal-to-noise ratio at the expense of some temporal resolution.

In summary, the Glycopeptide workflow is optimized to enhance sensitivity and accommodate higher-mass species, while the Peptide workflow prioritizes selectivity and efficiency within a more typical peptide mass range.