Research use resources
Semax purity: what a Semax lab report should show
Semax is a short synthetic peptide, seven amino acids long. Its lab report is quick to read once you know three things: how identity is confirmed, what an oxidized version looks like, and which similar name it can be confused with. For the basics of any report, see How to read a peptide lab report.
The short version
What Semax is, chemically
Semax is Met-Glu-His-Phe-Pro-Gly-Pro: methionine, glutamic acid, histidine, phenylalanine, proline, glycine and proline. The first four match a short piece of ACTH (positions 4 to 7), and Pro-Gly-Pro is added at the end.
| Reference fact | Semax, as on our product page |
|---|---|
| Sequence | Met-Glu-His-Phe-Pro-Gly-Pro |
| Form | Freeze dried (lyophilized) powder |
Purity
Purity is measured the same way as for any peptide: HPLC, with a detector set around 214 nm, and purity as the main peak’s share of the area of every peak. With only seven amino acids, Semax leaves fewer near copies from synthesis than a long peptide does, so the small peaks to look at are mostly an oxidized version (below) and any leftovers from making it.
Our Semax report from Janoshik Analytical (test #169749, June 2026) shows 98.80% purity.
Identity: confirmed by mass spec
Mass spectrometry confirms the main peak is Semax by weighing it. The report should state that the measured mass matches the compound named on it. Semax often shows up with one charge and with two at the same time, so two signals on one spectrum can point to the same molecule.
Oxidation: the one to watch
The first amino acid, methionine, can take up an oxygen atom when the peptide is exposed to air, light or heat. That version carries one extra oxygen atom and shows as a separate small peak. A clean report shows little or none of it. Keeping the powder sealed, cold and dark (our product page says −20 °C, away from light) is what keeps it that way.
A similar name
N-acetyl Semax amidate adds an acetyl group at the start of the chain and an amide at the end. It is a different molecule with its own mass, and its report should say so. If the mass on a report doesn’t fit the name on the label, the two don’t match.
Our Semax report
Our Semax is listed with a report from Janoshik Analytical, test #169749 (June 2026): 98.80% purity. The link on the product page opens the report on Janoshik’s own site (verify.janoshik.com), so you see it straight from the lab, not a copy. Like every report, it covers the sample that was tested, and the product page says so when the current lot isn’t confirmed as that sample.
Checking a Semax report, step by step
- Name and sequence: Semax, Met-Glu-His-Phe-Pro-Gly-Pro.
- Identity confirmed by mass spec as Semax, not N-acetyl Semax amidate.
- Purity from HPLC, with the method shown.
- Little or no oxidized form on the HPLC trace.
- The report number opens the same report on the lab’s own site.
Common questions
Is N-acetyl Semax amidate the same as Semax?
No. It has two extra groups, one at each end, so it is a different molecule with its own mass. Each needs its own report.
Where do I find the Semax report?
On the Semax product page under Specifications & documentation, and on our research materials page, which lists every report.