Choosing a research peptide supplier starts with the requirements of the laboratory, not a headline purity percentage. Before ordering, establish what material the project needs, what documentation is available and how the delivered batch will be recorded.

This checklist is for UK laboratory procurement. It is not guidance on human or veterinary use.

1. Identify the exact material

Record the product name, catalogue reference, stated quantity and any relevant sequence, modification or chemical form. Similar names do not necessarily describe interchangeable materials. If a specification needed for your project is missing, ask the supplier before placing the order.

Keep your required specification separate from the supplier’s available specification. That makes an unanswered question visible rather than turning an assumption into part of the purchase record.

2. Ask which batch the documentation covers

Request the certificate of analysis or relevant analytical report for the batch being offered. Check the material name, batch or lot identifier, reporting laboratory, test date, methods and results. A general example certificate is not a substitute for a record connected to the supplied lot.

If the batch has not yet been allocated, agree how the corresponding documents will be provided. Do not record a pending document as verified.

3. Separate purity, identity and content

A laboratory should distinguish the questions each analytical result addresses. Chromatographic purity, molecular identity and peptide content are different attributes. A single percentage should not be treated as an answer to all three.

For example, Bachem explains that peptide content can differ from HPLC purity because the material can also contain counter-ions and residual moisture. GenScript describes using both HPLC and mass spectrometry in its quality checks. These examples illustrate why the method matters; they do not establish anything about a different supplier’s batch.

Assess the methods against your own study requirements. Do not assume a purity result also establishes sterility, stability or suitability for an intended application.

4. Confirm the practical supply details

Before purchase, clarify stock status, delivery arrangements, the material-specific storage information and the process for reporting a discrepancy. Ask for the supplier’s business and support details needed by your procurement team.

Use the documented instructions for the particular material. A general online storage rule should not replace product-specific information or your laboratory’s procedures.

5. Record receipt and any unresolved questions

On arrival, connect the delivery record, product label and available batch documents. Record the receipt date, condition and assigned storage location under your laboratory’s procedures. Escalate mismatched labels, missing records or other discrepancies before releasing the material for the planned work.

A compact procurement checklist

• Exact material and specification recorded.
• Supplier and catalogue reference identified.
• Batch-document availability confirmed.
• Test methods and results assessed against project requirements.
• Delivery and material-specific storage information understood.
• Receipt checks and discrepancy handling assigned.

Checking the ADINA catalogue

Review the ADINA research catalogue alongside the current quality and batch-document status. Where documentation is pending, contact ADINA for clarification rather than assuming that a certificate is available.

For background on analytical terminology, visit the Learning Centre. For a material or documentation question, use the laboratory enquiry form.

Sources and further reading

• Bachem: care and handling of peptides, including peptide content
• GenScript: recommended peptide purity guidelines

Prepared 23 September 2026. Educational procurement guidance for laboratory research materials; no medical, dosing or self-administration advice.