Certificate of Analysis (COA)

A Certificate of Analysis (COA) is a formal batch record for a research-grade peptide. Depending on the supplier and test package, a peptide COA may include: the supplier name and address; the product name, sequence, and CAS number where applicable; the batch (lot) number and manufacture date; purity testing data with supporting chromatogram where available; appearance notes; solubility notes; water content when relevant; residual solvents; counter-ion content; and the signature of the analyst or quality control officer. Some suppliers add extra identity or biological-assay tests when those tests have been run for the relevant batch. The COA is important for traceability in published research: when you cite 'Peptide X (Peptra Labs, batch 12345)' in a publication, the batch number lets other researchers - or peer reviewers - retrieve the exact batch record where available. Without batch documentation, batch-to-batch reproducibility cannot be claimed. Peptra Labs keeps batch-level CoA records where available; if you need to check a specific lot for an audit, publication, or institutional procurement, email info@peptralabs.com with the batch number from the vial label.