Why a Certificate of Analysis Alone Isn't Enough

A Certificate of Analysis is a document produced by the manufacturer of a research compound, reporting the results of analytical testing performed on a specific lot. Properly executed, a COA reports HPLC purity, mass spectrometric identity confirmation, net peptide content, and related quality metrics tied to a unique batch identifier.

In practice, the integrity of a COA depends on a chain of trust that is difficult to verify from the outside. Several documented patterns recur in the research peptide supply chain.

Documented failure modes

• Identical COA imagery reused across multiple lots, with only the batch number altered between copies.
• COAs presented as third-party analytical reports that are in fact produced in-house by the manufacturer.
• COAs that report purity to one decimal place without the underlying chromatogram or mass spectrum that would support the value.
• COAs whose stated method does not match the type of analysis represented (for example, an HPLC purity figure reported on a method specification that does not describe a peptide-appropriate column or detection wavelength).

What honest documentation looks like

Honest documentation acknowledges what the document can and cannot establish. A manufacturer COA paired with the corresponding raw analytical traces — chromatogram, mass spectrum, integration table — is a stronger record than a single summary page. Independent verification on a randomly selected sample is stronger still, and is the standard toward which serious suppliers are expected to work.

A COA is a claim. Independent verification is a result.

The CRL position on COA documentation is published separately and is updated as the chain-of-custody and independent-testing protocols come online. The Journal will publish independent results, including those that fail, as they are received.