Peptide quality control · 2026-08-10
What a certificate of analysis cannot prove
A boundary map for avoiding claims that extend beyond the actual tests, sample and documented scope.
A certificate of analysis summarizes specified tests for an identified sample or batch. It does not automatically establish every quality attribute, the performance of an unrelated method or suitability for a user's particular protocol.
The reported scope matters. Identity evidence does not by itself prove purity, concentration, sterility or biological activity. Chromatographic purity does not automatically establish mass balance or the absence of every possible contaminant.
The defensible practice is to map each required decision to evidence that directly supports it. Any remaining requirement should be recorded as not tested, not supplied or not yet qualified rather than inferred from a headline result.
Practical review points
- List the decisions the buyer needs to make
- Map each decision to a direct test or record
- Keep untested attributes explicit
- Avoid extrapolating beyond the sampled batch
- Reject protocol-suitability claims without supporting evidence
Primary references
References provide general analytical and quality-system context; they do not imply regulatory approval or certification of PeptideQC Global.