PeptiSynt approaches a COA as a collection of measurements with defined limits. Read the sample identity and method description before interpreting the headline result.
Start with the sample, not the percentage
Match the product identifier, stated chemical form and lot number to the label and your receiving record. A report for a different batch cannot establish the properties of the batch received. Note the report date and issuing laboratory, and keep the original file alongside its download source.
For each test, separate the method, result, units and acceptance criterion. A chromatographic result, a mass measurement and a content assay address different questions. A missing measurement stays unknown; it is not filled in by another test with a reassuring number.
Use a short review worksheet
- What material and lot were submitted?
- Which method produced each result?
- Are results numerical where a quantity is claimed?
- Are units, reporting limits and method identifiers available?
- Can the issuing laboratory clarify an ambiguous result?
Keep a separate column for questions still open. For example, identity data do not establish sterility, and a purity result does not itself establish how much target peptide is present by weight. Ask for the specific evidence your experiment needs instead of treating the document as a universal approval.
The FDA’s discussion of ICH Q7 illustrates why batch identity and test-specific results matter in analytical documentation. That pharmaceutical guidance is background reading here; citing it does not certify a research supplier or convert a research material into a medicine.
Frequently Asked Questions
Does a COA prove the material is suitable for every experiment?
No. Suitability depends on the measurements required by the protocol and the limitations of the reported methods.
What should I do if the lot number does not match?
Keep the discrepancy in the receiving record and obtain clarification before treating the report as evidence for that material.
Sources and further reading
Continue reading
- Chromatographic Purity, Content and the Missing Questions
- Batch Provenance: Keep Every Link Inspectable
For laboratory research use only. Not for human or animal use.