Labs typically choose a peptide analysis technique based on the question being asked and the required level of confidence in the result. A practical workflow often combines more than one method:
- HPLC to assess separation behavior and estimate purity-related peaks
- Mass spectrometry to confirm molecular mass and detect common variants or truncations
- Sequence-focused methods when identity confirmation requires deeper characterization
Key selection factors
Consider the peptide’s length, complexity, modifications, expected impurities, and whether the goal is identity, purity, or batch-to-batch comparability. For example, a simple identity check may rely on mass confirmation, while release testing usually benefits from both chromatographic and mass-based evidence.
Laboratories should also align the method with acceptance criteria, instrument capability, and the documentation provided on the COA. When reviewing results, confirm that analytical conditions are reported clearly enough to support reproducibility and internal quality records.
Research peptides are intended for research use only and are not intended for human consumption.