Kisspeptin-10 (KP-10) Testing & Verification
Independent, third-party analysis of mail-in Kisspeptin-10 samples by RP-HPLC-UV — confirming that the vial holds the 10-residue fragment rather than another kisspeptin length, and reporting purity and net peptide content.
What Kisspeptin-10 is
Kisspeptin-10, also called KP-10 or metastin 45-54, is a synthetic 10-amino-acid peptide corresponding to the C-terminal decapeptide fragment of kisspeptin, with an amidated C-terminus. Kisspeptins are investigated as endogenous ligands of the KISS1 receptor, and several fragment lengths share the same C-terminal sequence — kisspeptin-54 (full-length metastin), kisspeptin-14, kisspeptin-13, and kisspeptin-10 — which means 'kisspeptin' on a label is ambiguous until the specific fragment is confirmed. Analytically, KP-10 is a favorable molecule for UV work: it contains tryptophan, tyrosine, and phenylalanine, giving it a distinctive UV absorbance spectrum beyond the generic peptide-bond signal. It is a research compound, not an approved drug, and grey-market material carries no regulated identity or content guarantee.
Why get your Kisspeptin-10 independently tested
- Fragment-length identity: kisspeptin-10, -13, -14, and -54 are different molecules that share a C-terminal sequence, and market listings do not always say which one was filled. Each fragment length has its own reversed-phase retention time, so an identity match against a certified KP-10 reference standard confirms the vial holds the decapeptide specifically.
- C-terminal amidation: authentic KP-10 is a C-terminal amide. A free-acid version — a plausible synthesis shortcut or error — is a chemically different peptide with shifted retention behavior, and the identity comparison against the amidated standard is what catches it.
- Small fills, proportionally large errors: KP-10 is typically sold in low-milligram vials, where modest absolute fill errors and non-peptide weight (acetate counter-ion, residual water, bulking agents) represent a large fraction of the labeled amount. The net-peptide assay reports the actual milligrams of peptide rather than gross powder mass.
- Synthesis impurities even in a short sequence: a 10-mer is easier to make than a 40-mer, but deletion sequences, incomplete deprotection products, and tryptophan-related oxidation byproducts still occur and travel with the product. Chromatographic purity as area percent quantifies how much of the UV-absorbing material is the main peak.
What we measure on Kisspeptin-10
Every Kisspeptin-10 certificate reports exactly three results by reversed-phase HPLC with UV/diode-array detection at 214 nm. Identity is established by matching your sample's retention time and UV spectrum to a certified KP-10 reference standard — and because KP-10 contains tryptophan, tyrosine, and phenylalanine, its diode-array spectrum in the 250-290 nm region is unusually informative for a peptide this small; chromatographic purity is reported as the area percent of the main peak; and the net-peptide assay reports the milligrams of peptide present per vial.
Every result is issued as a certificate of analysis you — or anyone you forward it to — can verify cryptographically. Reporting identity, purity, and milligram content is the point: a vial can be pure and still underfilled, so we report all three. More on purity vs. net-peptide content and how to read a peptide COA.
Our scope — stated plainly
Testing is RP-HPLC-UV against a certified reference standard. Kisspeptin-10 is a less-common compound, so a qualified reference standard may need to be sourced before analysis, which can affect turnaround; we will confirm with you first. KMD Analytical is an independent laboratory; we do not perform mass spectrometry, sterility, endotoxin, heavy-metal, or residual-solvent testing.
KMD is an independent RP-HPLC-UV lab. We do not run LC-MS / mass-spec, sterility, endotoxin, or heavy-metal testing. If your job needs a capability we don't have, we'll say so.
Kisspeptin-10 testing — FAQ
Can you tell Kisspeptin-10 apart from Kisspeptin-54 or the 13/14-residue fragments?
Yes. Although the fragments share a C-terminal sequence, they differ substantially in length and therefore in reversed-phase retention time, so they separate cleanly under our method. Identity is confirmed by retention-time and UV-spectral match against a certified KP-10 standard — a chromatographic match, not a mass-spectrometry sequence confirmation.
Is RT plus UV spectrum enough for a peptide this small?
For KP-10 it works better than for most small peptides, because the sequence contains tryptophan, tyrosine, and phenylalanine. Those aromatic residues give the diode-array spectrum distinctive features in the 250-290 nm region on top of the retention-time match, making a coincidental match by an unrelated compound less likely. That said, the method's limit is honest to state: it cannot read the sequence the way mass spectrometry can.
Can you confirm the C-terminal amide?
Indirectly. The free-acid analog is a different molecule with different chromatographic behavior, so a sample that co-elutes with the certified amidated KP-10 standard and matches its UV spectrum is consistent with the amidated peptide. Direct proof of the amide group itself would require mass spectrometry, which is outside our scope.
My vial is labeled 5 mg or 10 mg — what will the assay actually report?
The net-peptide assay reports the measured milligrams of peptide in the vial you send, excluding counter-ion, water, and excipient weight. On small kisspeptin fills, that non-peptide mass can be a meaningful share of the gross weight, so the certificate number is the honest basis for comparing against the label.
Other peptides we test
Retatrutide · Cagrilintide · Tesamorelin · BPC-157 · see the full panel.