Research compound reference

Selank and Semax mixture

The Selank and Semax mixture is a lyophilized mixture of two synthetic peptides, Selank and Semax, in one sealed container. Purity by HPLC and net content are reported for each lot on a lot-specific Certificate of Analysis. The material is for in vitro laboratory research. This page is a technical reference to each component's identity and chemistry, and to the material's analytical testing and laboratory handling.

For research use only. Not for human or veterinary, diagnostic or therapeutic use.

The components

The mixture contains two separate peptides. A mixture has no single molecular formula, so each component is described by its own PubChem record.

SelankC₃₃H₅₇N₁₁O₉, 751.9 g/molH-TKPRPGP-OH, 7 residues. PubChem CID 11765600.

SemaxC₃₇H₅₁N₉O₁₀S, 813.9 g/molH-MEHFPGP-OH, 7 residues. PubChem CID 9811102.

What is the Selank and Semax mixture?

The Selank and Semax mixture is a mixture of two separate synthetic peptides in one lyophilized solid.

Selank is a synthetic linear heptapeptide, H-TKPRPGP-OH. It is catalogued under CAS 129954-34-3 and PubChem CID 11765600, with the molecular formula C₃₃H₅₇N₁₁O₉ and a molecular weight of 751.9 g/mol.¹

Semax is a synthetic linear heptapeptide, H-MEHFPGP-OH. It is catalogued under CAS 80714-61-0 and PubChem CID 9811102, with the molecular formula C₃₇H₅₁N₉O₁₀S and a molecular weight of 813.9 g/mol.²

The components are not chemically bonded to each other. The material described on this page is intended as a laboratory reagent.

2peptide components

751.9g/mol, Selank¹

813.9g/mol, Semax²

Handling

The Selank and Semax mixture is a dry solid as received in the laboratory. General handling guidance for lyophilized peptides applies.³

Allow the sealed container to reach room temperature before opening, so moisture does not condense on the solid.³
Keep the solid dry and away from bright light. Moisture lowers long-term stability.³
Avoid repeated freezing and thawing.³

Storage and stability

State	Temperature	Notes
Dry, sealed	-20 °C, or preferably -80 °C³	Keep dry and away from bright light. Moisture lowers long-term stability.³
Freezing and thawing	Avoid repeated freezing and thawing	Applies to the dry solid.³

How each lot is tested

Each lot is tested by an independent third-party laboratory.⁴ The Selank and Semax mixture certificate page names the testing laboratories and lists each lot's purity, net content and test date. Three measurements are reported.

Identity

Mass spectrometry

Identity by mass spectrometry is reported for each lot as tested. For reference, the calculated monoisotopic masses are 751.43 Da for Selank¹ and 813.35 Da for Semax.²

A matching mass is consistent with the expected composition. It does not confirm the order of residues.

Purity

High-performance liquid chromatography (HPLC)

Separates the components from synthesis-related impurities. Purity is reported for the lot as a share of the total detected signal.

Reported per lot on the Certificate of Analysis.

Quantity

Net content

Measures the mass of material actually present in the sample tested.

Reported per lot on the Certificate of Analysis.

Technical notes

What does the Certificate of Analysis report for a mixture?

The certificate page lists each lot with identity by mass spectrometry, purity by HPLC, net content and test date. Values are reported for the mixture as tested.

Why are formulas given for each component?

A mixture has no single molecular formula or weight. Each component is described by its own PubChem record.

Why is the material freeze-dried?

Peptides are most stable as dry solids. Moisture reduces long-term stability, so the material is lyophilized and kept sealed until use in the laboratory.