Research use only. The information below concerns laboratory reference materials for in-vitro research and makes no medical, therapeutic, diagnostic, cosmetic or performance claims.
A catalogue name and a purity percentage are not enough to qualify a peptide reference material for laboratory work. This checklist separates material identity, lot evidence, release disposition and fulfilment claims so each can be assessed against the intended in-vitro use. It is a procurement framework, not certification of any supplier.
1. Define the material and intended use
Record what the material will be used to check, compare or control before comparing suppliers. A reference material must be fit for that stated purpose. A certified reference material is a narrower category with documented property values, uncertainties and metrological traceability; the presence of a document titled certificate of analysis does not by itself make a product a certified reference material or its supplier an accredited reference-material producer.
2. Match the exact identity and package
Compare the canonical name, sequence, CAS number where applicable, molecular formula, molecular weight, salt or counterion form and package mass. Aliases and catalogue codes help discovery, but they cannot replace the molecular identity. For blends, identify every component and its stated amount separately.
3. Connect vial, SKU, lot and report
The vial label, ordered SKU, package size, lot number and source report must resolve to the same material. A report from another package or lot is contextual evidence only. Prefer a stable lot record that remains available after stock changes, including an explicit released, archived, rejected or withdrawn disposition.
4. Ask what each result proves
| Evidence | Question it addresses | What it does not establish alone |
|---|---|---|
| RP-HPLC purity | What proportion of the reported chromatographic area belongs to the main peak under that method? | Identity, net peptide content, sterility or elemental impurities. |
| Mass spectrometry | Is the observed mass consistent with the expected molecular identity? | Complete sequence, chromatographic purity, net content or microbiological quality. |
| Content, water and counterion | How does the supplied mass relate to peptide amount and form? | Identity or absence of process-related contaminants. |
| Endotoxin | What result was measured for bacterial endotoxin under the reported method? | Sterility, bioburden or identity. |
| Bioburden | What viable-microbial count was measured for the tested sample under the stated method? | Sterility, endotoxin or identity. |
| Sterility | What growth result was observed for the tested sample under the stated conditions? | A claim beyond the tested sample, method and sampling plan. |
| Elemental impurities | What reported levels were found for the specified elements? | Organic purity, identity or microbiological quality. |
5. Inspect the source report
Look for the testing laboratory, report identifier and date, sample or lot reference, method, measured result, applicable units or decision limits and disposition. A cropped screenshot or supplier-written summary is not equivalent to the attributable source document. Read the COA interpretation guide and verify released records in the COA Vault.
6. Keep evidence and logistics separate
A complete analytical panel does not prove that stock exists, and a dispatch promise does not prove analytical quality. Confirm current release state, available package, dispatch origin, lead time, replacement terms and support route independently. During a pre-release or incoming state, an availability estimate must not be read as a passed lot.
Procurement acceptance checklist
- The intended laboratory use is written down.
- The canonical identity and package match the requirement.
- Alias, sequence, formula, molecular weight and salt form do not conflict.
- Vial, SKU, lot and report identifiers agree.
- Every required measurement has a result, method and applicable unit or decision limit.
- Purity, identity, content, endotoxin, bioburden and sterility results are not treated as interchangeable.
- The source report identifies its laboratory and report date.
- The lot disposition and any archive, rejection or withdrawal history are visible.
- Stock and dispatch claims are verified separately from analytical evidence.
- The procurement decision and source-document version are recorded internally.
Continue the qualification
Review the release evidence policy, use the laboratory calculator only with verified material values, then compare the available reference-material catalogue by compound and package.