HPLC-Verified Peptides UK

A purity figure only means something if you can trace where it came from. Every batch we supply is run by high-performance liquid chromatography before release, and the chromatogram that produced the number travels with the order as part of the batch-specific Certificate of Analysis. You are not asked to trust a rounded marketing claim of 99%+; you can look at the trace, find the target peak, see what else resolved, and check that the reported value matches what the integration shows. Recent COAs sit in the on-site COA library so you can inspect the analytical record before you commit to a batch. Compounds are handled cold-chain throughout, because a peptide that degrades in transit no longer matches the chromatogram that certified it. Everything here is supplied for in-vitro laboratory research only.

High-performance liquid chromatography pushes a dissolved sample through a packed column under high pressure. Each component in the sample interacts with the column differently, so compounds emerge — elute — at different times. A detector at the column outlet records what passes through, producing the chromatogram: a baseline with peaks rising from it, each peak corresponding to a substance leaving the column at a characteristic retention time.

For a synthetic peptide, the intended compound should dominate the trace as one large, well-resolved peak at its expected retention time. Smaller peaks elsewhere represent everything that is not the target — typically truncated sequences, deletion products and other synthesis-related species. Purity is calculated from peak area: the area under the target peak expressed as a percentage of the total integrated area across the chromatogram. That percentage is what appears on the COA. Because the figure is derived from a measured trace rather than asserted, two analysts integrating the same run should arrive at the same value, which is precisely why HPLC is the reference method for purity in peptide work. The retention time of the target peak also provides a check that the species resolving in the run is consistent with the expected compound, which is recorded against the batch on its certificate.

The batch-specific Certificate of Analysis is the document that connects a physical vial to its analytical record. It carries the compound name and the batch number printed on your vial label, so the two can be cross-checked on arrival. It states the HPLC purity measured for that batch — the actual integrated value, which varies slightly run to run rather than a fixed catalogue figure — and the chromatogram or its summary so the number is traceable to a trace. The reported retention time lets you confirm the certified value belongs to the peak the run was meant to characterise.

Used properly, the COA lets you screen a batch against the purity threshold your protocol calls for before the compound enters an experiment, rather than assuming. A COA ships with every order, and recent COAs are published in the on-site library for review beforehand. Dispatch is from a UK facility — same working day when an order is confirmed before the daily cut-off, with tracked next-working-day UK delivery — and cold-chain handling protects the compound so it still corresponds to its certificate when it reaches the bench. Trade and wholesale enquiries are handled through the trade desk.