Catalogue / Prostamax
Prostamax
Also written as Lys-Glu-Asp-Pro, KEDP peptide.
A tetrapeptide bioregulator combining the basic N-terminus of Livagen with the proline C-terminus of Cortagen.
| Molecular formula | C20H33N5O9 |
| Average mass | 487.5 Da |
| Monoisotopic mass | 487.2278 Da |
| Residues | 4 |
| Termini | C-terminal free acid |
| Class | Short bioregulator peptides |
| Determination | Peptide analysis, catalogue compound |
| Price | 341 USD |
Computed at build time from the composition shown on this page, not transcribed from a supplier datasheet.
Prostamax has an average molecular weight of 487.5 daltons and a monoisotopic mass of 487.2278 daltons. Identity is confirmed by matching the measured deconvoluted mass to that figure, and purity is reported separately by reversed-phase chromatography at 214 nm. The two numbers answer different questions and neither substitutes for the other.
| One letter | KEDP |
| Three letter | Lys-Glu-Asp-Pro |
| Modifications | C-terminal free acid |
The formula and both masses in the table above are derived from this sequence and these terminal modifications. A reader who believes a figure is wrong can check the composition rather than take the number on trust, which is the point of publishing it this way.
A sequence is not an identity result. It is the expected composition against which a measured mass is compared, and the comparison is what appears on the certificate.
| Charge | m/z |
|---|---|
| [M+1H]+ | 488.235 |
| [M+2H]2+ | 244.621 |
These are the ions an electrospray source is expected to produce for a neutral mass of 487.2278 daltons, computed from the monoisotopic mass and the proton mass. They are what a raw spectrum should show before deconvolution.
A report that gives only a deconvoluted mass without the charge states it was derived from cannot be checked. Deconvolution is a calculation, and a calculation whose inputs are not shown is an assertion.
| Shares Lys-Glu-Asp with Livagen. The 26 dalton gap between them is well within what a careless nominal-mass assignment will miss. |
| The C-terminal proline suppresses C-terminal fragment ions, so sequence order is harder to confirm by fragmentation than the intact mass implies. |
| Zwitterionic across the useful pH range, which makes retention strongly dependent on mobile phase composition. The method conditions belong on the certificate. |
Every compound fails in its own way. A generic peptide method applied without regard to these specifics produces a number that looks like a result and is not one.
Di, tri and tetrapeptides. Low molecular weight makes them the hardest class to quantify honestly: at this size the counter-ion and residual water can outweigh the peptide itself.
LC-MS identity, purity by RP-HPLC with a polar-retentive column since these peptides are barely retained on standard C18, and net peptide content because a purity figure alone is close to meaningless here.
Where the delivered milligram figure matters rather than the percentage, net peptide content by combustion analysis and water by Karl Fischer are added, and the certificate carries a closed mass balance instead of a single purity number.
| LC-MS identity | Measured mass |
| RP-HPLC purity | Area at 214 nm |
| Net peptide content | Milligrams |
| Water content | Karl Fischer |
| Counter-ion | Ion chromatography |
| Bacterial endotoxins | USP <85> |
What is the molecular weight of Prostamax?
The average molecular weight is 487.5 daltons and the monoisotopic mass is 487.2278 daltons, computed from the sequence KEDP shown on this page. Both figures are calculated rather than transcribed, so they can be checked against the stated composition.
How is Prostamax tested for purity and identity?
LC-MS identity, purity by RP-HPLC with a polar-retentive column since these peptides are barely retained on standard C18, and net peptide content because a purity figure alone is close to meaningless here. Purity describes the chromatographable fraction only and is not the same quantity as the peptide mass delivered per vial.
What goes wrong when Prostamax is analysed?
Shares Lys-Glu-Asp with Livagen. The 26 dalton gap between them is well within what a careless nominal-mass assignment will miss.
What does Prostamax analysis cost at ANALYTON?
Peptide analysis, catalogue compound is priced at 341 US dollars, covering the determinations described on this page. Content, safety and elemental determinations are ordered alongside and are priced separately on the price list.
Updated 2026-09-01. Masses computed at build, not transcribed.