Certificate of Analysis (COA)
An official lab document reporting purity, identity, and quality results for a peptide batch.
Definition
A document issued by a testing laboratory reporting the results of analytical testing performed on a specific batch of peptide. Includes purity percentage, identity confirmation, and other quality metrics.
In More Detail
A Certificate of Analysis (COA) is the formal record of a peptide batch's quality. A complete COA typically includes the peptide name and sequence, lot number, manufacture and test dates, methods used, purity percentage with the corresponding HPLC chromatogram, identity confirmation with the mass spectrum, water content, counterion content, residual solvent levels, and the analyst's signature. Researchers and pharmacies should treat a COA from the manufacturer with the same skepticism as any vendor-supplied document and verify with independent third-party testing for high-stakes work.