A peptide certificate of analysis (COA) summarizes key quality and identity data for a specific batch. For laboratory purchasers, it is one of the most important documents for confirming that the material matches the supplier’s stated specifications.
Common COA elements
- Product name and catalog or batch number
- Peptide sequence or identifier
- Purity result, often reported by HPLC
- Identity confirmation, commonly supported by mass spectrometry
- Molecular weight and calculated mass
- Appearance and packaging details
- Testing date and analyst or laboratory information
A complete COA should also indicate whether the result applies to the specific lot received, not a general product line. Researchers often compare the COA against the purchase order, label, and shipping record to confirm traceability.
If a COA is missing batch-specific data, uses unclear methods, or does not match the vial label, it should be reviewed carefully before use. Research peptides are intended for laboratory research only and are not intended for human consumption.