Peptide sequence analysis is typically performed by combining chromatographic separation with mass spectrometric identification. In a laboratory workflow, the peptide is first assessed for purity and heterogeneity using HPLC or a related method, then analyzed by MS to determine ion masses and fragmentation patterns.
Common analytical approach
- Separate the sample to reduce interference from impurities or byproducts.
- Measure the intact mass to confirm the expected molecular weight.
- Fragment the peptide using tandem mass spectrometry to map the amino acid order.
- Compare the results with the theoretical sequence and any known modifications.
Sequence analysis is especially important when confirming synthetic peptides, identifying truncation products, or evaluating post-synthetic modifications such as oxidation or amidation. Results should be interpreted alongside the certificate of analysis, method details, and acceptance criteria used by the lab.
For research materials, documentation should clearly state the analytical method, observed masses, and any uncertainties. Products are intended for research use only and are not intended for human consumption.