Catalogue / Cartalax
Cartalax
Also written as Ala-Glu-Asp, AED peptide.
A tripeptide bioregulator at 333 daltons, the smallest of the Khavinson series after the dipeptides, and entirely acidic apart from the N-terminal amine.
| Molecular formula | C12H19N3O8 |
| Average mass | 333.29 Da |
| Monoisotopic mass | 333.1172 Da |
| Residues | 3 |
| 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.
Cartalax has an average molecular weight of 333.29 daltons and a monoisotopic mass of 333.1172 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 | AED |
| Three letter | Ala-Glu-Asp |
| 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]+ | 334.124 |
| [M+2H]2+ | 167.566 |
These are the ions an electrospray source is expected to produce for a neutral mass of 333.1172 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.
| Three residues and two of them acidic means almost no positive-mode ionisation. Negative mode is usually the honest choice and the certificate should state which was used. |
| At 333 daltons the trifluoroacetate counter-ion is a quarter of the delivered powder. A purity percentage without a counter-ion determination overstates the delivered peptide substantially. |
| The series shares residues in different orders. Cartalax, Cortagen and Bronchogen all begin Ala-Glu-Asp and differ only in what follows, so an incomplete synthesis of one is an exact match for another. |
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 Cartalax?
The average molecular weight is 333.29 daltons and the monoisotopic mass is 333.1172 daltons, computed from the sequence AED shown on this page. Both figures are calculated rather than transcribed, so they can be checked against the stated composition.
How is Cartalax 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 Cartalax is analysed?
Three residues and two of them acidic means almost no positive-mode ionisation. Negative mode is usually the honest choice and the certificate should state which was used.
What does Cartalax 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.