99%+ Measured
99% Purity Peptides UK
Not a marketing number — the actual HPLC-measured value recorded on each batch COA.
99%+ purity is not a marketing number — it is a measured HPLC value recorded on each batch Certificate of Analysis. The remaining <1% is typically water, counter-ions and trace synthesis impurities.
Our research-supply standards
99%+ HPLC Purity
Every batch is verified by high-performance liquid chromatography. The measured purity figure is recorded on the batch COA — not a marketing claim.
COA With Every Order
A batch-specific Certificate of Analysis ships with every order. Sample COAs are accessible from the COA library before you order.
UK Dispatch
Orders confirmed before the daily cut-off ship the same working day from our UK facility, with tracked next-working-day UK delivery as standard.
Research-Only Supply
All compounds are supplied strictly for in-vitro laboratory research. Documentation, labelling and packaging reflect that restriction.
Our research compound catalogue
A purity figure you can trace to a chromatogram
On this page "99%+" is a number with a paper trail behind it. Each batch is analysed by HPLC before release, and the figure printed on that batch's Certificate of Analysis is the value the instrument actually recorded — not a rounded category like "high purity" applied across a catalogue. Because peptide synthesis output varies slightly from run to run, the measured percentage shifts batch to batch, and we publish whichever value the chromatogram returned. The batch-specific COA travels with your order, and recent certificates sit in the on-site COA library so the documentation is checkable before and after purchase. Compounds are handled cold-chain because peptides are temperature-sensitive, and dispatched from a UK facility. Everything here is supplied strictly for in-vitro laboratory research only.
What sits in the sub-1% fraction
No synthetic peptide is ever exactly 100% pure, which is why a credible figure is stated as 99%+ rather than "absolute". The remaining fraction below the headline number is made up of well-understood, characterisable material rather than anything mysterious. In practice it is dominated by bound water and counter-ions — peptides are typically isolated as salts (for example acetate or trifluoroacetate), so a measurable share of the dried mass is the associated ion and adsorbed moisture rather than the peptide backbone itself. The balance is trace synthesis-related impurities: closely-related sequences such as deletion or truncation by-products that elute near the main peak during chromatography. HPLC separates these by retention time and reports the target compound as a percentage of total peak area, so the measured purity already accounts for them. Where applicable, water content and counter-ion content are documented separately on the Certificate of Analysis, which is why the COA is more informative than a single purity line. For in-vitro laboratory research only — this is an account of what is in the vial, not guidance on use.
From measured value to documented batch
A purity figure is only useful to a research lab if it is tied to the exact vial in hand, which is the role the Certificate of Analysis plays. Each batch carries its own COA recording the HPLC-measured purity for that production run, and that document is what ships with the order — so the number you verify is the number you receive, not a catalogue-wide claim. Recent certificates are kept in the on-site COA library, letting you inspect representative documentation before ordering and cross-check the paperwork against the batch reference afterwards. Handling is cold-chain throughout, because peptides are temperature-sensitive and stability is part of keeping a measured value meaningful at the point of receipt. Dispatch is from a UK facility — same working day when an order is confirmed before the daily cut-off, on a tracked next-working-day UK service. Larger or repeat requirements, where consistent batch documentation matters most, are handled through the trade desk. As with everything on this page, supply is for in-vitro laboratory research only.
Frequently asked questions
- How is 99% purity calculated?
- Peak area of the target compound in HPLC, as a percentage of total peak area for the chromatogram.
- Why not 99.5% or 99.9%?
- Peptide synthesis purity above 99% is normal; figures vary batch-to-batch. We report the actual measured value, not a rounded marketing figure.
- Are stacks 99%+ pure?
- Each component compound in a stack is individually 99%+ HPLC, with separate COAs.
- What if my batch is below 99%?
- We do not release batches below our purity threshold. The COA shows the exact value for your batch.
- Is 99% pure enough for research?
- For most published research protocols, yes. Always check the protocol's purity requirement against your batch COA.
Order research compounds from a UK supplier
Browse the full catalogue, view the COA library for a recent batch, or open a trade account for institutional supply. All orders dispatch from our UK facility with HPLC-verified compounds.