PeptiCore guide
How to Read a Peptide COA: Purity, Batch and Analytical Data
A certificate of analysis is useful when its identifiers and analytical results can be connected to the exact catalog record under review. Start with identity and batch fields, then examine the reported analytical method and result in context.
Published by PeptiCore on 11 Jul 2026 · Last reviewed 12 Aug 2026
Quick answer
Read a peptide COA as a record-matching exercise first: confirm the product, SKU or specification, batch reference, document date, and stated analytical method before interpreting a reported result. HPLC and mass-spectrum records provide different context, so neither should be used as a substitute for the other. For a catalog inquiry, retain the exact SKU that matches the documentation you reviewed.
Key takeaways
- Start with record identity: Check the product name, SKU or specification, batch identifier, document date, and any reference number.
- Read the result with its method: A reported purity value should be read together with the method named on the document.
- Check document scope: Note whether the document is a preview, a batch-level record, or a general specification reference.
Start with record identity
Check the product name, SKU or specification, batch identifier, document date, and any reference number. These fields establish which catalog record the document describes. A matching product name alone is not enough when several sizes exist.
Read the result with its method
A reported purity value should be read together with the method named on the document. HPLC commonly describes chromatographic purity, while mass-spectrum data supports molecular-identity review. The two records answer different analytical questions.
Check document scope
Note whether the document is a preview, a batch-level record, or a general specification reference. Confirm that units, expected mass, and the listed format are legible before using the document in an internal review.
Common review mistakes
Avoid treating every percentage as the same measurement, mixing records from different SKUs, or assuming that a series-level image identifies a batch. Keep the selected SKU, specification, and document reference together.
Common interpretation errors
Do not treat a percentage alone as a complete COA review. Confirm the product identity, batch reference, method, result, and document date belong to the same catalog record.
Frequently asked questions
What should I check first on a peptide COA?
Begin with product identity, SKU or specification, batch reference, and document date.
Does an HPLC result confirm molecular identity?
HPLC and mass-spectrum records provide different analytical context; review the stated method and result together.
How do I request a listed COA?
Use the product specification table to identify the SKU, then include that SKU in the PeptiCore inquiry.
Related product specifications
Continue reading
Catalog and documentation path
Use the catalog to identify an exact SKU, the Quality page to review documentation access, and the inquiry workflow to keep the selected record visible when requesting a final quote.
Sources and review references
These references support the analytical terminology and documentation-review framework used in this guide. PeptiCore catalog availability remains SKU-specific. Read the documentation review policy.