Selank

Selank is a synthetic heptapeptide based on the endogenous peptide tuftsin, extended with additional residues that improve its stability as a defined synthetic sequence. It is catalogued under CAS 129954-34-3 with the molecular formula C₃₃H₅₇N₁₁O₉ and a reported mass of approximately 751.9 Da. Because it is produced synthetically rather than extracted, the seven-residue peptide can be reproduced consistently from lot to lot, and it is supplied strictly as a research material for in-vitro work by qualified laboratory personnel.

Selank is produced by solid-phase peptide synthesis and presented as a white lyophilized powder. The catalog offers 5mg and 10mg presentations, suitable for analytical characterization and small-scale laboratory research. The freeze-dried format supports stable cold storage and reliable shipping, and the peptide is readily soluble in water-based research preparations when a working solution is prepared for a bench protocol. It is part of the Cognitive Research category at Prototides. The combination of basic and acidic residues in the heptapeptide makes it readily soluble in neutral aqueous solvents, so reconstitution is typically rapid. Researchers frequently record the reconstitution date alongside the lot identifier, allowing the age of a working solution to be tracked against the analytical reference recorded on its Certificate of Analysis.

Every lot is characterized for identity and purity with two complementary methods. RP-HPLC separates the target peptide from related impurities using a solvent gradient and resolves it as a dominant chromatographic peak under UV detection, allowing chromatographic purity to be assessed. LC-MS confirms the peptide's molecular mass against the theoretical value for the sequence. Together the two methods give orthogonal evidence — one based on chromatographic behavior, the other on molecular mass — that the seven-residue peptide matches the identity recorded for its lot.

For research handling, the lyophilized powder is stored at -20 °C and protected from light. Once reconstituted with a solvent appropriate to the protocol, solutions are commonly divided into aliquots and kept cold to reduce freeze–thaw cycling, which helps preserve a consistent reference between measurements. The reconstitution solvent, working concentration, and downstream handling are determined by the researcher according to the requirements of the specific experiment.

Lot-traceable documentation ships with each order: the Certificate of Analysis, the RP-HPLC purity report, and the independent third-party report, all tied to a verifiable lot identifier that links the records to the supplied material. Selank is provided for laboratory research use only. It is not a drug, food, or supplement and is not intended for human consumption, therapeutic use, diagnostic use, or veterinary use.