To read a peptide Certificate of Analysis (COA), first match the document to the exact product and batch, identify the report issuer, then check each method, result and unit. Separate what has been measured from what remains unverified. A matching compound name or a headline percentage is not enough to establish that a report covers your order.
Start with the match
Put the product listing, the document and the batch details beside each other. Check the compound name, listed quantity, presentation and batch reference. If an item offers different formats or quantities, confirm which option the document covers.
For example, a document headed “TB-500 10mg” should not be treated as documentation for a product listed as “TB-500 5mg” without clarification. Likewise, ask whether a document covers a vial, an atomised formulation or a research dispensing pen. A shared compound name does not resolve those questions.
Identify the document
Check who issued it, the report identifier, the date, and whether it is an originating laboratory report, a supplier document or an Alpha analytical summary. If a summary refers to another report, ask for the source document and a way to check that reference.
Our document library distinguishes Alpha analytical summaries from archived material. An available download is not, by itself, confirmation that it covers the batch offered for your order.
Read the result with its label
Look for the stated test method, the sample identifier, the reported result and its units, any acceptance criteria, and the report’s qualifications. Do not substitute a headline percentage for the rest of that information.
- Which property was tested, and how is the result described?
- What material was submitted for testing?
- Does the document identify the same batch you are considering?
- Are the original report pages and supporting records available?
- Is anything missing, unclear or inconsistent with the listing?
Purity, identity and peptide content: three different checks
A COA is easier to interpret when each result is matched to the question it answers.
| Check | What to look for | Important distinction |
|---|---|---|
| Identity | Methods and results supporting the compound assignment, such as mass spectrometry. | A molecular-mass result is not a measurement of the quantity in a vial. |
| Chromatographic purity | The HPLC method, chromatogram and reported peak-area percentage. | A peak-area percentage is not the percentage of the total powder mass that is peptide. |
| Peptide content | A separately reported content result and its measurement method. | Water and counterions can affect composition; content and chromatographic purity are not interchangeable. |
For the analytical background, see Bachem’s guide to peptide quality control. This reference explains analytical principles; it does not verify Alpha Peptides® products or batches.
For more detail, read what a 99% purity result means. For the wider purchasing decision, use our UK research supplier checklist.
Keep the answer with the order
Save the relevant document and any written confirmation of batch coverage with your procurement record. If a document changes, that record helps establish what you reviewed at the time.
If you need us to check a match, send the product name, selected format, quantity and report reference to the Alpha team. We can check what documentation is available; the suitability decision for a laboratory’s work belongs with its own qualified team and procedures.
Next: compare product information or read our receiving and storage checklist.