By Wholesale Lab Peptides · Published · Procurement guide
Connect the chromatogram to the offered lot.
For a BPC-157 or KPV enquiry, match the chromatogram's sample identifier to the laboratory report and proposed supply lot. Keep the analysis date, report revision and sample description together. A graph headed only with a peptide name leaves the commercial connection unresolved.
Use the sample custody guide when the submission-to-report link needs clarification. Here, the next task is narrower: deciding whether two chromatographic reports provide a fair comparison.
Put the conditions beside the result.
FDA's 2015 analytical-method guidance, sections IV.B-I describes equipment, operating settings, system suitability and calculation details. Its context is drug applications; it does not establish approval or compliance for our research supply. The useful purchasing question is whether the report identifies the procedure behind its number.
| Field | Request or reconcile |
|---|---|
| Method reference | Procedure identifier, revision and stated analytical purpose. |
| Separation conditions | Column reference, mobile phases, gradient and run duration. |
| Detection | Detector type, relevant settings and displayed signal. |
| Peak table | Peak labels, retention times, integrated areas and reported calculation. |
| Integration | Rules for including, excluding and combining signals. |
| Run checks | Applicable blank, reference and system-suitability records. |
Ask the laboratory to explain material differences. A matching document title does not establish that both reports used the same procedure.
Resolve missing context before ranking suppliers.
Suppose two suppliers quote the same named peptide. One provides a cropped plot and a percentage; the other provides a full report with a method reference and peak table. The second submission answers more review questions. That alone does not prove its material is better, and the first report's missing details should be requested before drawing a comparison.
Record the comparison as complete, incomplete or requiring laboratory interpretation. Keep the reason beside the decision. If methods differ, ask the reviewer whether the results can support the same purchasing requirement. Do not silently treat "HPLC tested" as a shared specification.
A peak label needs a supported interpretation.
Ask which peak represents the named material and what supports that assignment. Retain the full plot with its axes and peak table. If a component is unassigned, keep that status visible rather than supplying an identity from another vendor's graph.
ICH Q2(R2), section 3.1.2.2, corrected April 2025 discusses labelled representative chromatograms and evaluating separation between relevant components. Its analytical-validation principles explain why a clear-looking plot is not, by itself, a complete assessment of interference.
Use the separate LC-MS identity guide for mass assignments. Keep molecular identity review connected to, but distinct from, the HPLC comparison.
Keep the peak table with the reported percentage.
Check that the report's included peaks and calculation basis are explained. Where processing or integration changed, request the report revision and laboratory explanation. Preserve the received version and its clarification together; a purchasing team should not redraw baselines or recalculate an unexplained result to create a pass.
For the distinction between area percentage and measured peptide amount, use the purity versus content guide. This review establishes comparability, rather than inventing a universal purity threshold.
One combined plot does not resolve every ingredient.
For GLOW, KLOW or another requested blend, ask how the method addresses the stated components and which peaks were assigned. Keep unresolved ingredient identities or content specifications open. A single percentage should not be expanded into a confirmed amount for each component.
Likewise, identify whether a vial sample or material from a defined pen-style kit was analysed. The report's scope should remain tied to that submission; it does not automatically cover packaging components or every unit in an order.
Bring the material and review requirements together.
Send the named peptides, requested quantities, vial or defined kit presentation and destination in the USA, Canada or Australia. Include the chromatogram and method records your technical reviewer needs. Wholesale strengths, configurations, available documents and any separately agreed analytical scope are confirmed during enquiry.
Request HPLC documentation for an enquiryExplore the wholesale catalogue and OEM and private-label options, or email sales@wholesalelabpeptides.com.