1. Match the document to the lot
Compare the lot or batch number on the container with the identifier on the report. Also check the material name, sample description, report number, issuing laboratory, and testing date. A certificate for another lot is not a substitute for the lot you are reviewing.
Keep the complete report, including additional pages and any revisions. If identifiers disagree or a page is missing, ask for clarification rather than assuming the documents refer to the same material.
2. Read the test method and units
Identify which result comes from HPLC, mass spectrometry, or another named method. Check the units and whether the report provides a measured result, a specification, or simply a pass/fail conclusion. These are different kinds of information.
A chromatographic area percentage describes the fraction of integrated detector signal assigned to a peak under the stated method. It does not automatically establish the net peptide quantity in a vial. Gross powder mass can include water, counterions, and other components.
3. Keep purity, identity, and content separate
Read the chromatogram alongside the method and integration information. For mass spectrometry, compare the reported mass assignment with the expected material and the laboratory's interpretation. An expected-mass match supports identity assessment; a molecular-mass result alone does not establish every aspect of sequence, structure, or purity.
A test only reports the properties it measures. Do not infer sterility, endotoxin results, suitability for an experiment, or any other unreported attribute from an HPLC percentage. Ask the laboratory which additional methods are needed for your research requirements.
4. Preserve the evidence
Record the report identifier and version alongside your receiving record and lot number. Note unresolved questions and keep the laboratory's written answers with the original document. This makes the basis for your review visible when the material or documentation is checked again.
Sources and further reading
- Agilent: area-percent terminology
- MilliporeSigma: peptide purity and gross versus net weight
- Waters: peptide mass confirmation and impurity profiling
These sources explain analytical concepts; they do not certify an Azura product or lot.
Understand the documentation
Learn what a certificate reports, how analytical methods differ, and how to match a lot. All research guides
Anyone can consult the COA Library for documents on file. If a lot or report cannot be matched, contact us before relying on it. This guide does not replace a laboratory's report or your institution's review.