A Certificate of Analysis (COA) is your primary link between a catalog peptide and the specific vial on your bench. Learning to read — and verify — a COA protects experimental reproducibility and audit readiness.
Essential COA fields
Every valid COA from our laboratory includes:
- Product name and catalog code — matched to the vial label.
- Batch / lot number — unique identifier tied to synthesis and QC records.
- Test date and analyst signature — with method references.
- Purity result — HPLC area percent at defined wavelength.
- Identity confirmation — typically MALDI-TOF or ESI-MS.
Comparing lots
When continuing a long-running study, compare impurity profiles — not just headline purity — between lots. A shift in early-eluting peaks may indicate a process change that does not affect the main peak area but could alter biological readouts in sensitive assays.
Archiving for compliance
Store COAs alongside your study records. For GLP-adjacent workflows, maintain the original PDF hash or printed copy with receipt date. Our COAs are version-controlled; the portal always serves the current release document for active lots.
If you need a consolidated COA package for multiple SKUs in one order, request it at checkout — we compile batch-specific documents within one business day.