How to Read a Peptide Certificate of Analysis (COA)

A Certificate of Analysis (COA) is a document issued for a specific production lot of a material. It records which tests were run on that lot, the methods used, and the results. It is a record about one lot — not a general statement about a product name. This guide explains the common sections in general terms; it does not describe any specific Neon Valley Research product.

1. Lot identity: which material the report covers

Every useful COA identifies the material and the lot (or batch) number it applies to. That lot number is the link between the paper and the vial. A report without a lot number, or with a lot number that does not appear on your vial label, cannot confirm anything about the material in hand.

2. Test date and issuing laboratory

Look for the date the analysis was performed and the name of the laboratory that performed it. The date places the result in time relative to manufacture and storage. The laboratory name lets a reader judge who produced the data. A report that omits either is harder to rely on.

3. Identity versus purity

These are two different questions, and a COA may answer one, both, or neither:

Identity asks whether the material is what it is labeled as — typically by comparing a measured molecular mass with the expected value for the stated sequence or structure.
Purity asks how much of the sample is the target compound relative to other detected components, usually expressed as a percentage of total detected signal under the stated method.

A high purity figure does not by itself confirm identity, and a matching mass does not by itself establish purity.

4. HPLC and mass spectrometry, at a high level

High-performance liquid chromatography (HPLC) separates the components of a sample over time. The report usually includes a chromatogram — a trace with peaks — and a purity value calculated from the area of the main peak relative to all integrated peaks. Check that the method (column, detection wavelength) is stated.

Mass spectrometry (MS) measures the mass-to-charge ratio of ionized molecules. For peptides, the observed mass is compared with the theoretical mass of the expected sequence. Salt forms and modifications change the expected value, which is why the supplied form matters when reading an MS result.

5. Matching a report to your lot

Read the lot or batch number on the vial label.
Find the COA whose lot number matches exactly.
Confirm the material name and stated quantity match the label.
Note the test date, laboratory, methods, and which results (identity, purity) are reported.

6. Published documentation vs. an undocumented listing

A catalog listing with a linked, lot-specific report is a documented listing. A listing with no published report is undocumented: no test result should be assumed for it. At Neon Valley Research, items without a published report are labeled “No report currently published.” rather than being described with purity figures or testing status that no document supports.