Rigid COA Evaluation Standards
How to properly audit a Certificate of Analysis (COA) to ensure peptide reagents meet strict in-vitro analytical criteria.
Educational reference only. Not a substitute for a validated laboratory method or lot-specific testing.
Deconstructing the Certificate
A Certificate of Analysis summarizes results for a specified sample or lot. Useful details include the sample identifier, date, issuing laboratory, methods, acceptance criteria, and results. A report only supports properties actually evaluated.
Request supporting chromatograms, spectra, and method details when needed to assess the result. A summary percentage alone does not explain integration settings, impurity resolution, or sample handling.
Verifying Third-Party Independence
Independent testing can add evidence beyond internal quality control. Check the laboratory, methods, sample identity, and accreditation scope. Independence or accreditation alone does not guarantee that a report is accurate or unaltered.
Researchers must cross-reference the testing facility's accreditation and verify that the lot number on the COA precisely matches the physical vial.
Critical Rejection Criteria
Acceptance criteria should be established for the application and validated method, not assumed from a universal percentage or mass tolerance.
Unexpected peaks, mismatched lot identifiers, or inconsistent results warrant investigation under the laboratory's quality procedures.