A three-residue tripeptide — lysine, proline, valine — used in in-vitro work on short peptides. 10 mg vial, lyophilized powder, ≥99% HPLC purity verified by third-party analysis. For laboratory research use only.
Research areas
- Short peptides and sequence fragments
- In-vitro cell models
- Tripeptide solubility and stability
Technical data
| Field | Value |
|---|---|
| Name | KPV (Lys-Pro-Val) |
| Quantity per vial | 10 mg |
| Sequence | Lys-Pro-Val — three amino acids |
| Molecular weight | ≈ 342.4 Da |
| Form | Lyophilized powder (unless stated otherwise) |
| Purity | ≥ 99% (HPLC) — see batch COA |
| Ships from | France, within 24 h on working days |
Three residues, not thirteen: the identity check
The product name is literally its sequence: K for Lys, P for Pro, V for Val. Three amino acids, that is all.
This tripeptide is the C-terminal end of a much longer parent peptide of thirteen amino acids. Hence the most common identification error on this reference: both circulate in the same catalogues and are regularly confused, although they are two distinct compounds about a factor of five apart in molecular mass.
The check is purely mass-based and appears on the COA:
| KPV | Parent peptide (13 residues) | |
| Length | 3 amino acids | 13 amino acids |
| Molecular weight | ≈ 342.4 Da | ≈ 1,665 Da |
A vial sold as "KPV" whose mass spectrometry report shows a peak near 1,665 Da, or whose sequence counts thirteen residues, does not contain the tripeptide. That is a check to run on the certificate, not a matter of trust.
Why choose NEXUS KPV
- Third-party verified purity: every batch is HPLC-tested by an independent laboratory and the certificate of analysis (COA) can be checked before ordering.
- Documented identity: sequence and mass appear on the COA, which is what distinguishes the tripeptide from the longer parent peptide.
- Shipped from France: dispatched within 24 h on working days, delivered in 2–5 working days to France and 8 European countries. Free shipping from €120.
- Consistent quality: same supplier, same controls, same packaging from one batch to the next.
- Verified reviews: our customers leave their feedback on Trustpilot; we do not edit it.
Reconstitution and handling
The lyophilisate is reconstituted with bacteriostatic water, which keeps the solution preserved after opening. Lyophilized KPV is described as highly water-soluble: it dissolves quickly.
Add the solvent slowly down the vial wall, let it run, then swirl gently — no vigorous shaking, no vortex, as shear denatures peptides. The solvent volume never changes the mass present in the vial; it changes only the resulting concentration. Our reconstitution calculator gives the resulting concentration for any volume.
Storage
Lyophilized powder: -20 °C or below, protected from light and moisture; stable for years when unopened. After reconstitution: 2–8 °C, protected from light, with a reference shelf life of 28 days. For longer storage, frozen aliquots are preferable to repeated freeze-thaw cycles.
Common laboratory mistakes
- Confusing the tripeptide with the thirteen-residue parent peptide. Three amino acids and ≈342.4 Da on the COA are enough to tell them apart.
- Treating concentrations from publications as transposable references. Micromolar values in culture are specific to each preclinical protocol.
- Using plain sterile water for a vial that will be opened several times. Without a preservative the solution is unprotected once the stopper has been pierced several times.
- Vortexing the vial. Gentle swirling is enough, all the more so as the powder dissolves quickly.
- Repeatedly refreezing the reconstituted solution. Each cycle degrades a fraction of the tripeptide. Aliquot right after reconstitution.
Frequently asked questions
What does the name "KPV" mean?
It is literally the tripeptide's sequence in single-letter code: K for lysine, P for proline, V for valine. Three amino acids, in that order.
How can I check that the batch received is the tripeptide?
Through the batch certificate of analysis (COA): it carries the sequence and the molecular weight, about 342.4 Da. The parent peptide this tripeptide ends counts thirteen residues for about 1,665 Da — the gap is wide and leaves no room for doubt.
How can I check the purity of a batch?
Every batch is HPLC-tested at ≥99% purity and comes with a third-party certificate of analysis (COA), viewable from the Quality page and on request before ordering.
What should this peptide be reconstituted with?
Bacteriostatic water, which keeps the solution preserved after opening. Plain sterile water is unsuitable once the vial is pierced more than once. The powder is described as highly water-soluble.
How long does the reconstituted solution keep?
28 days at 2–8 °C, protected from light. Beyond that, frozen aliquots are preferable to repeated freeze-thaw cycles.
Where is the order shipped from and how fast?
From France, within 24 h on working days. Parcel-shop or home delivery in 2–5 working days depending on the country. Free from €120.
In what context may this product be used?
Exclusively for laboratory and in vitro research. It is not intended for human or animal consumption, nor for diagnostic or therapeutic use.
NEXUS Quality Standard
Every NEXUS research compound is produced under strict quality control procedures. Each batch undergoes independent analytical testing to verify identity, assay accuracy, purity, microbial safety, endotoxin levels, heavy metal screening, and full batch traceability.
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For laboratory research only. KPV 10mg is not suitable for human or animal consumption. Not a drug, food or cosmetic. To be handled by qualified personnel in accordance with applicable regulations.